LU503654B1 - Method for preparing vanadium-doped and high-water single-crystal manganochromite under high-temperature and high-pressure condition - Google Patents
Method for preparing vanadium-doped and high-water single-crystal manganochromite under high-temperature and high-pressure condition Download PDFInfo
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- LU503654B1 LU503654B1 LU503654A LU503654A LU503654B1 LU 503654 B1 LU503654 B1 LU 503654B1 LU 503654 A LU503654 A LU 503654A LU 503654 A LU503654 A LU 503654A LU 503654 B1 LU503654 B1 LU 503654B1
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- manganochromite
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- 239000013078 crystal Substances 0.000 title claims abstract description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 70
- 239000007787 solid Substances 0.000 claims abstract description 61
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 49
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 49
- 239000010439 graphite Substances 0.000 claims abstract description 49
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 22
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims abstract description 20
- VQWFNAGFNGABOH-UHFFFAOYSA-K chromium(iii) hydroxide Chemical compound [OH-].[OH-].[OH-].[Cr+3] VQWFNAGFNGABOH-UHFFFAOYSA-K 0.000 claims abstract description 20
- IPJKJLXEVHOKSE-UHFFFAOYSA-L manganese dihydroxide Chemical compound [OH-].[OH-].[Mn+2] IPJKJLXEVHOKSE-UHFFFAOYSA-L 0.000 claims abstract description 20
- 239000011656 manganese carbonate Substances 0.000 claims abstract description 16
- 229940093474 manganese carbonate Drugs 0.000 claims abstract description 16
- 235000006748 manganese carbonate Nutrition 0.000 claims abstract description 16
- 229910000016 manganese(II) carbonate Inorganic materials 0.000 claims abstract description 16
- XMWCXZJXESXBBY-UHFFFAOYSA-L manganese(ii) carbonate Chemical compound [Mn+2].[O-]C([O-])=O XMWCXZJXESXBBY-UHFFFAOYSA-L 0.000 claims abstract description 16
- 229910001252 Pd alloy Inorganic materials 0.000 claims abstract description 14
- BBKFSSMUWOMYPI-UHFFFAOYSA-N gold palladium Chemical compound [Pd].[Au] BBKFSSMUWOMYPI-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- POILWHVDKZOXJZ-ARJAWSKDSA-M (z)-4-oxopent-2-en-2-olate Chemical compound C\C([O-])=C\C(C)=O POILWHVDKZOXJZ-ARJAWSKDSA-M 0.000 claims abstract description 12
- 229910021542 Vanadium(IV) oxide Inorganic materials 0.000 claims abstract description 12
- DUSYNUCUMASASA-UHFFFAOYSA-N oxygen(2-);vanadium(4+) Chemical compound [O-2].[O-2].[V+4] DUSYNUCUMASASA-UHFFFAOYSA-N 0.000 claims abstract description 12
- XYQQGESWGNLKIO-UHFFFAOYSA-N acetic acid;chromium;dihydrate Chemical compound O.O.[Cr].[Cr].[Cr].CC(O)=O.CC(O)=O.CC(O)=O.CC(O)=O.CC(O)=O.CC(O)=O.CC(O)=O XYQQGESWGNLKIO-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000007858 starting material Substances 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 235000006408 oxalic acid Nutrition 0.000 claims abstract description 5
- 238000003760 magnetic stirring Methods 0.000 claims description 26
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 22
- 239000011521 glass Substances 0.000 claims description 21
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 20
- 239000011651 chromium Substances 0.000 claims description 13
- 238000000227 grinding Methods 0.000 claims description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 12
- 230000003247 decreasing effect Effects 0.000 claims description 12
- 239000003517 fume Substances 0.000 claims description 12
- 239000011812 mixed powder Substances 0.000 claims description 12
- 239000001301 oxygen Substances 0.000 claims description 12
- 229910052760 oxygen Inorganic materials 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 12
- 229910052786 argon Inorganic materials 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 10
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 10
- 239000001569 carbon dioxide Substances 0.000 claims description 10
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 10
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 9
- 229910052804 chromium Inorganic materials 0.000 claims description 9
- 239000011572 manganese Substances 0.000 claims description 9
- 239000010935 stainless steel Substances 0.000 claims description 9
- 229910001220 stainless steel Inorganic materials 0.000 claims description 9
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 9
- DECCZIUVGMLHKQ-UHFFFAOYSA-N rhenium tungsten Chemical compound [W].[Re] DECCZIUVGMLHKQ-UHFFFAOYSA-N 0.000 claims description 8
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052593 corundum Inorganic materials 0.000 claims description 6
- 239000010431 corundum Substances 0.000 claims description 6
- 239000011261 inert gas Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000004570 mortar (masonry) Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000001354 calcination Methods 0.000 claims description 5
- 229910052720 vanadium Inorganic materials 0.000 claims description 5
- PQLVXDKIJBQVDF-UHFFFAOYSA-N acetic acid;hydrate Chemical compound O.CC(O)=O PQLVXDKIJBQVDF-UHFFFAOYSA-N 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000007731 hot pressing Methods 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 4
- PXXKQOPKNFECSZ-UHFFFAOYSA-N platinum rhodium Chemical compound [Rh].[Pt] PXXKQOPKNFECSZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000005245 sintering Methods 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 3
- 238000001291 vacuum drying Methods 0.000 claims description 3
- 229910000691 Re alloy Inorganic materials 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 6
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000006297 dehydration reaction Methods 0.000 description 5
- 229910052748 manganese Inorganic materials 0.000 description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 235000010755 mineral Nutrition 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 230000035484 reaction time Effects 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- 229910000629 Rh alloy Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003837 high-temperature calcination Methods 0.000 description 2
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Inorganic materials O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 2
- 229910052592 oxide mineral Inorganic materials 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- 239000002738 chelating agent Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009775 high-speed stirring Methods 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B7/00—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions
- C30B7/10—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions by application of pressure, e.g. hydrothermal processes
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/16—Oxides
- C30B29/22—Complex oxides
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
A method for preparing vanadium-doped and high-water single-crystal manganochromite under a high-temperature and high-pressure condition comprises: preparing a cylindrical manganochromite sample using solid roseate trigonal rhombus manganese carbonate crystals, solid chromium(III) acetate hydroxide crystalline powder, solid vanadium(IV) oxide acetylacetonate powder, solid oxalic acid, solid pyrochroite powder, solid chromium hydroxide powder and liquid dilute nitric acid as starting materials; preparing two water-sourced discs from the pyrochroite powder and the chromium hydroxide powder according to a weight ratio of 4:1; and placing the two water-sourced discs at two ends of the cylindrical manganochromite sample, and then placing the cylindrical manganochromite sample with the water-sourced discs in a double-layer experimental sample chamber with an inner tube being a graphite tube and an outer tube being a gold-palladium alloy tube for high-temperature and high-pressure reaction to obtain single-crystal manganochromite. The present invention solves the problem that there is no technique for preparing large-grained, vanadium-doped and high-water single-crystal manganochromite under a high-temperature and high-pressure condition at present.
Description
METHOD FOR PREPARING VANADIUM-DOPED AND HIGH-WATER LU503654
SINGLE-CRYSTAL MANGANOCHROMITE UNDER HIGH-TEMPERATURE AND
HIGH-PRESSURE CONDITION
[0001] 1. Technical Field
[0002] The present invention belongs to the technical field of single-crystal mineral sample synthesis, and particularly relates to a method for preparing vanadium-doped and high-water single-crystal manganochromite under a high-temperature and high-pressure condition.
[0003] 2. Description of Related Art
[0004] As an important end-member component of the chromite sub-group of spinellides, manganochromite, the crystallochemical formula of which is MnCr204, is an important oxide mineral rich in manganese and chromium.
[0005] Manganochromite with a spinel structure does not contain hydrone or hydroxyl in its molecular structure, and is manifested as an obvious nominal unhydrous mineral. There has not been yet an effective method for synthesizing manganochromite so far So, it becomes particularly urgent to effectively synthesize large-grained, vanadium-doped and high-water single-crystal manganochromite to meet geoscientific research requirements of various high-temperature and high-pressure laboratory simulations, especially the requirement for studying the lattice preferred orientation and crystal axis anisotropy of single-crystal manganochromite under high pressure.
[0006] The technical issue to be settled by the present invention is to provide a method for preparing vanadium-doped and high-water single-crystal manganochromite LU503654 under a high-temperature and high-pressure condition, to solve the above-mentioned technical problems.
[0007] The technical solution of the present invention is as follows:
[0008] A method for preparing vanadium-doped and high-water single-crystal manganochromite under a high-temperature and high-pressure condition, comprising: preparing a cylindrical manganochromite sample using solid roseate trigonal rhombus manganese carbonate crystals, solid chromium(IIT) acetate hydroxide crystalline powder, solid vanadium(IV) oxide acetylacetonate powder, solid oxalic acid, solid pyrochroite powder, solid chromium hydroxide powder and liquid dilute nitric acid as starting materials; preparing two water-sourced discs from the pyrochroite powder and the chromium hydroxide powder according to a weight ratio of 4:1; and placing the two water-sourced discs at two ends of the cylindrical manganochromite sample, and then placing the cylindrical manganochromite sample with the water-sourced discs in a double-layer experimental sample chamber with an inner tube being a graphite tube and an outer tube being a gold-palladium alloy tube for high-temperature and high-pressure reaction to obtain single-crystal manganochromite.
[0009] Preferably, the purity of the roseate trigonal thombus manganese carbonate crystals is over 99.99%, the purity of the solid chromium(III) acetate hydroxide crystalline powder is over 99.99%, the purity of the solid vanadium(IV) oxide acetylacetonate powder is over 99.99%, the purity of the solid oxalic acid powder is over 99.99%, the purity of the solid pyrochroite powder is over 99%, the purity of the solid chromium hydroxide powder is 99%, and the concentration of the liquid dilute nitric acid is 10%.
[0010] Preferably, the cylindrical manganochromite sample is prepared by:
[0011] Step 1: measuring out 60 ml of dilute nitric acid with the concentration of 10%, and pouring it in a beaker with a notch;
[0012] Step 2: weighing out 5.0 g of solid trigonal rhombus manganese carbonate LU503654 crystals, adding then into the beaker with the notch, and putting a magnetic stirring rotor in the beaker with the notch;
[0013] Step 3: covering the beaker with watch-glass, placing the beaker on a high-temperature magnetic stirring heater coil in a fume hood, and reacting for 72 hrs at normal temperature and 700 rpm;
[0014] Step 4: measuring out 17.4949 g of high-purity solid chromium(III) acetate hydroxide crystalline powder and 135 ml of high-purity solid vanadium(IV) oxide acetylacetonate powder according to manganochromite Mn(Cr,V)204 stoichiometry, and adding them to the diluted nitric acid solution in the beaker;
[0015] Step 5: covering the beaker with the watch-glass:
[0016] Step 6: placing the beaker on the high-temperature magnetic stirring heater coil in the fume hood, and stirring for 48 hrs at normal temperature and 800 rpm;
[0017] Step 7: weighing out 2 g of high-purity solid oxalic acid powder, and placing it in the beaker;
[0018] Step 8: placing the beaker on the high-temperature magnetic stirring heater coil in the fume hood, covering the beaker with the watch-glass, and setting parameters of the high-temperature magnetic stirring heater coil to 80 °C and 1000 rpm for stirring for 36 hrs;
[0019] Step 9: removing the watch-glass from the beaker, and increasing the temperature of the high-temperature magnetic stirring heater coil to 110 °C until the mixed solution in the beaker is completely desiccated;
[0020] Step 10: taking the magnetic stirring rotor out of the beaker, stripping sample powder adhering to a surface of the magnetic stirring rotor into the beaker, taking all mixed powder out of the beaker, and placing it in a graphite crucible;
[0021] Step 11: increasing the temperature of the graphite crucible containing the mixed powder to 1100 °C at a rate of 300 °C/h by means of a muffle furnace which is at LU503654 normal pressure, and maintaining the graphite crucible at this temperature for 5 hrs;
[0022] Step 12: cooling the mixed powder in the graphite crucible in the muffle furnace to room temperature at a rate of 200 °C/h;
[0023] Step 13: grinding the mixed powder in a corundum mortar for 1 h to obtain an experimental powder sample;
[0024] Step 14: cold-pressing the experimental powder sample into three ® 10.0 mm * 3.0 mm sample discs by a tungsten carbide grinding tool of a stainless steel press, and stacking the three sample discs at a bottom of the graphite crucible from bottom to top
[0025] Step 15: hanging the graphite crucible in a middle of a high-temperature oxygen atmosphere furnace, connecting and fixing two ends of a platinum-rhodium metal wire of the graphite crucible to a vertical four-hole aluminum oxide tube, and fixing an upper end of the four-hole aluminum oxide tube to a middle of a circular cover capable of being pushed into and pulled out of a furnace body:
[0026] Step 16: placing a stainless steel container containing secondary deionized pure cold water on one side of the high-temperature oxygen atmosphere furnace;
[0027] Step 17: connecting a top of the furnace body of the high-temperature oxygen atmosphere furnace to an argon inert gas cylinder and a proportion-adjustable carbon monoxide and carbon dioxide cylinder;
[0028] Step 18: opening an argon inert gas valve to continuously inject argon for 30 min, and under the protection of the argon, calcinating the sample at high temperature to 800 °C at a heating rate of 400 °C/h;
[0029] Step 19: when the temperature in the furnace body reaches 800 °C, switching a carbon monoxide and carbon dioxide gas control valve to enable a volume ratio of carbon monoxide and carbon dioxide in the oxygen atmosphere furnace to reach 4:1;
[0030] Step 20: increasing the temperature of a sample chamber in the furnace body to 1480 °C at a rate of 200 °C/h to perform constant-temperature calcination for 15 min to LU503654 melt the sample into glassy-state manganochromite;
[0031] Step 21: after the sample is calcinated at 1480 °C for 15 min, pulling the graphite crucible containing the sample, the four-hole aluminum oxide tube and the circular cover on the furnace body out of the furnace body, and then directly immersing then in the stainless steel container to quench the sample into manganochromite glass;
[0032] Step 22: taking the manganochromite glass out of the graphite crucible, grinding it into fine-grained and uniform-composition sample powder in the corundum mortar, and drying the sample powder in a vacuum drying oven at 200 °C for 12 hrs; and
[0033] Step 23: cold-pressing the dried sample powder into a ® 4.0 mm (diameter) * 4.0 mm (height) cylindrical manganochromite sample on a cold isostatic press by a tungsten carbide grinding tool.
[0034] Preferably, the water-source discs are prepared by:
[0035] Step 24: cold-pressing the pyrochroite powder and the chromium hydroxide powder on a cold isostatic press by a tungsten carbide grinding tool according to the weight ratio of 4:1 to obtain two ® 4.0 mm (diameter) * 0.1 mm (height) water-sourced discs.
[0036] Preferably, placing the two water-sourced discs at two ends of the cylindrical manganochromite sample and then placing the cylindrical manganochromite sample with the water-sourced discs in a double-layer experimental sample chamber with an inner tube being a graphite tube and an outer tube being a gold-palladium alloy tube for high-temperature and high-pressure reaction to obtain single-crystal manganochromite comprise:
[0037] Step 25: sealing the cylindrical manganochromite sample and the two water-sourced discs in the double-layer experimental sample chamber with the inner tube being the graphite tube and the outer tube being the gold-palladium alloy tube, placing the cylindrical manganochromite sample in a middle of the inner graphite tube, and placing LU503654 the water-sourced discs at two symmetrical ends of the inner graphite tube close to the sample;
[0038] Step 26: placing the double-layer sample chamber in a typical Kawai-1000t 6-8 multi-anvil, large-volume, high-temperature and high-pressure apparatus, and increasing the pressure and temperature to 3.0 GPa and 1080 °C at a rate of 0.5 GPa/h and a rate of 10 °C/min respectively for hot-pressing sintering, and reacting at constant temperature and constant pressure for 72 hrs;
[0039] Step 27: after reacting at constant temperature and constant pressure for 72 hrs, decreasing the temperature in a sample cavity from 1080 °C to 800 °C at a rate of 3 °C/min, and maintaining the temperature for 1h; then, decreasing the temperature in the sample cavity from 800 °C to room temperature at a rate of 5 °C/min;
[0040] Step 28: when the temperature in the sample cavity is decreased to room temperature, decreasing the pressure in the sample cavity from 3.0 GPa to normal pressure at arate of 0.5 GPa; and
[0041] Step 29: taking the sample out of the typical Kawai-1000t 6-8 multi-anvil, large-volume, high-temperature and high-pressure apparatus, removing the graphite tube and the gold-palladium alloy tube of the double-layer sample chamber outside the sample, cutting the cylindrical sample in the middle with a diamond wire cutter, and picking out single-crystal manganochromite under a 20-power high-precision Olympus microscope.
[0042] Preferably, during the high-temperature and high-pressure reaction, two sets of high-temperature tungsten-rhenium thermocouples are used for temperature calibration; each of the two sets of tungsten-rhenium thermocouples is composed of two tungsten-rhenium alloy wires made of different materials, the chemical composition of which is W95%Re5% and W74%Re26%; and the two sets of tungsten-rhenium thermocouples are symmetrically disposed at an upper end and a lower end of the double-layer sample chamber composed of the graphite tube and the gold-palladium alloy LU503654 tube.
[0043] The present invention has the following beneficial effects:
[0044] The vanadium-doped and high-water single-crystal manganochromite obtained through the method of the present invention is a pure substance and has good chemical stability. The method of the present invention has the remarkable advantages of a simple operation process and a short reaction time, and the obtained single-crystal manganochromite has good physical and chemical properties such as high purity, large size and stable chemical properties. Most importantly, the synthesized manganochromite has a high vanadium content (5000-6000 ppm wt%) and a high water content (200-300 ppm), and the vanadium content and the water content can be controlled. The single-crystal manganochromite has a large particle size, provides an important experimental sample guarantee for exploring the lattice preferred orientation and crystal axis anisotropy of single-crystal minerals under high pressure, and breaks through the technical bottleneck of single-crystal manganochromite synthesis.
[0045] The present invention provides a method for preparing vanadium-doped and high-water single-crystal manganochromite under a high-temperature and high-pressure condition, which specifically comprises:
[0046] Solid roseate trigonal rhombus manganese carbonate crystals (purity > 99.99%), solid chromium(III) acetate hydroxide crystalline powder (purity > 99.99%), solid vanadium(IV) oxide acetylacetonate powder (purity > 99.99%), solid oxalic acid (purity > 99.99%), solid pyrochroite powder (purity > 99%), solid chromium hydroxide powder (purity > 99%) and liquid dilute nitric acid (concentration: 10%) are used as starting materials.
[0047] Step 1: a chemical fume hood is opened, a volumetric flask with a standard LU503654 volume of 100 ml is selected to accurately measure out 60 ml of dilute nitric acid with the concentration of 10%, a glass pipette is placed in a 500 ml beaker with a notch, and the liquid diluted nitric acid is completely transferred into the beaker carefully through the pipette, wherein due to the fact that the beaker with the notch will not be completely sealed after the beaker is covered with watch-glass, the beaker with the notch is used as a reaction container to ensure that generated gas can be easily volatilized in the fume hood.
[0048] Step 2: 5.0 g of solid roseate trigonal rhombus manganese carbonate crystals are accurately weighed out with a 10 ug high-precision analytical balance, and are carefully added into the beaker containing the dilute nitric acid solution with the concentration of 10%, and a magnetic stirring rotor is put in the beaker.
[0049] Step 3: a mouth of the beaker containing the dilute nitric acid solution with the solid manganese carbonate crystals is covered with watch-glass, and then the beaker is placed on a high-temperature magnetic stirring heater coil in the fume hood; in order to fully dissolve the starting material, namely the solid manganese carbonate crystals, in the dilute nitric acid solution and make the solid manganese carbonate crystals undergo hydrolysis reaction and acidification reaction, the reaction temperature is normal temperature, the rotational speed is 700 rpm, and the reaction time is 72 hrs.
[0050] Step 4: 17.4949 g of high-purity solid chromium(III) acetate hydroxide crystalline powder and 135 mg of high-purity solid vanadium(IV) oxide acetylacetonate powder are accurately weighed out with the high-precision analytical balance according to manganochromite Mn(Cr,V),04 stoichiometry, and are carefully added to the dilute nitric acid solution containing the manganese carbonate crystals.
[0051] Step 5: the beaker containing the dilute nitric acid solution with the solid manganese carbonate crystals, the solid chromium(III) acetate hydroxide crystalline powder and the solid vanadium(IV) oxide acetylacetonate powder is covered with watch-glass to ensure that gas generated during reaction is volatilized via the notch of the LU503654 beaker, and the starting material, namely the dilute nitric acid solution, in the beaker is prevented from splashing during the high-speed stirring process, which may otherwise raise a risk and compromise the synthesis accuracy of single-crystal manganochromite.
[0052] Step 6: the beaker containing the sealed dilute nitric acid solution and magnetic stirring rotor is placed on the high-temperature magnetic stirring heater coil in the fume hood, stirring is performed at normal temperature and 800 rpm for 48 hrs to enable the starting materials, namely the solid manganese carbonate crystals, the solid chromium(IIT) acetate hydroxide crystalline powder and the solid vanadium(IV) oxide acetylacetonate powder, to be completely dissolved in the dilute nitric acid solution without any residues, and volatile substances such as NH3*H>0, CH4, C:H>, CO», CO and
H can be volatilized more easily in the fume hood.
[0053] Step 7: 2 g of high-purity solid oxalic acid powder is accurately weighed out with the high-precision analytical balance, and is added to the diluted nitric acid solution containing the solid manganese carbonate crystals, the solid chromium(lIT) acetate hydroxide crystalline powder and the solid vanadium(IV) oxide acetylacetonate powder, as an important metal-chelator.
[0054] Step 8: the beaker containing the mixed solution is placed on the high-temperature magnetic stirring heater coil in the fume hood again, and then the beaker is covered with the watch-glass; the parameters of the high-temperature magnetic stirring heater coil are set to 80 °C and 1000 rpm for stirring for 36 hrs to enable all the starting materials to form uniform colloidal sol under the combined action of dilute nitric acid and oxalic acid.
[0055] Step 9: the watch-glass is removed from the beaker, and the temperature of the high-temperature magnetic stirring heater coil is increased to 110 °C until the mixed solution in the beaker is completely desiccated.
[0056] Step 10: the magnetic stirring rotor is taken out of the beaker on the LU503654 high-temperature magnetic stirring heater coil, all sample powder adhering to the surface of the magnetic stirring rotor is stripped into the beaker, and all mixed powder in the beaker is carefully taken out with a spoon and is placed in a graphite crucible.
[0057] Step 11: the temperature of the graphite crucible containing the mixed powder is increased to 1100 °C at a low heating rate of 300 °C/h by means of a muffle furnace which is at normal pressure and high temperature, and the graphite crucible is maintained at this temperature for 5 hrs. The high-temperature calcination rate is low, and the temperature maintaining time is long.
[0058] Step 12: the mixed powder in the graphite crucible in the muffle furnace is cooled to room temperature at a rate of 200 °C/h. Compared with the heating rate, a relatively low cooling rate is more beneficial to the formation of cellular loose sample powder. The mixed powder is taken out carefully.
[0059] Step 13: the cellular loose manganochromite sample powder is fully ground in a super-hard thickened corundum mortar for 1 h to obtain a fine-grained and uniform experimental powder sample.
[0060] Step 14: the fine-grained and uniform manganochromite powder sample is cold-pressed into three ® 10.0 mm * 3.0 mm sample discs by a high-precision tungsten carbide grinding tool (size: ® 10.0 mm * 10.0 mm) of a stainless steel press; the three sample discs are stacked from bottom to top and are then carefully placed at the bottom of the graphite crucible.
[0061] Step 15: two circular holes with a diameter of 1.0 mm are symmetrically drilled in the wall of the graphite crucible, in which the three sample discs are stacked, by means of a high-speed electric drill. A 0.5 mm platinum-rhodium alloy wire is made to penetrate through the two symmetrical 1.0 mm circular holes in the wall of the graphite crucible carefully to hang the graphite crucible in the middle of a high-temperature oxygen atmosphere furnace. Two ends of the platinum-rhodium alloy wire penetrating through the LU503654 graphite crucible are connected and fixed to a vertical four-hole aluminum tube with a bore diameter of 0.6 mm, an outer diameter of 5.0 mm and a length of 40 mm. An upper end of the four-hole aluminum tube is fixed to the middle of a circular cover capable of being pushed into and pulled out of a furnace body at any time.
[0062] Step 16: a stainless steel container containing 3 L of secondary deionized pure cold water is placed on one side of the high-temperature oxygen atmosphere furnace in advance.
[0063] Step 17: the top of the furnace body of the high-temperature oxygen atmosphere furnace is connected to an argon inert gas cylinder and a proportion-adjustable carbon monoxide and carbon dioxide cylinder, the quantity of gas injected into a sample chamber is controlled through a barometer, and during the high-temperature calcination process, each gas can be switched and regulated in time through a valve.
[0064] Step 18: an argon inert gas valve is opened, and a pointer button controlled by the gas barometer is rotated to continuously inject argon for 30 min.
[0065] Step 19: when the temperature in the furnace body reaches 800 °C, a carbon monoxide and carbon dioxide gas control valve is switched quickly and the pointer button controlled by the gas barometer is rotated to enable the volume ratio of carbon monoxide and carbon dioxide in the oxygen atmosphere furnace to reach 4:1.
[0066] Step 20: when a mixed gas flow of the carbon monoxide and the carbon dioxide with the volume ratio of 4:1 in the sample chamber is stabilized, which takes about 3-5 min, the temperature of the sample chamber in the furnace body is increased to 1480 °C at a rate of 200 °C/h to perform constant-temperature calcination for 15 min to melt the sample into glassy-state manganochromite.
[0067] Step 21: after the sample is calcinated at 1480 °C for 15 min, the graphite crucible containing the sample, the four-hole aluminum oxide tube and the circular cover on the furnace body are pulled out of the furnace body and then directly immersed in the LU503654 stainless steel container containing 3L of secondary deionized pure cold water to quickly quench the sample into manganochromite glass.
[0068] Step 22: the manganochromite glass is taken out of the graphite crucible carefully, and is fully ground into fine-grained and uniform-composition sample powder in the corundum mortar. The glassy-state manganochromite powder is dried in a vacuum drying oven at 200 °C for 12 hrs.
[0069] Step 23: the manganochromite glass powder is cold-pressed on a cold isostatic press by a high-precision ® 4.0 mm (diameter) * 10.0 mm tungsten carbide grinding tool to obtain a ® 40 mm (diameter) * 40 mm (height) cylindrical manganochromite sample.
[0070] To obtain high-water manganochromite, pyrochroite powder (molecular formula: Mn(OH)») and chromium hydroxide powder (molecular formula: Cr(OH)s), the weight ratio of which is 4:1, are used as a water source. The mixture of pyrochroite and chromium hydroxide is used as the water source mainly for the following reasons: first, the pyrochroite and the chromium hydroxide are both typical hydrous substances and have low dehydration temperature, high-purity solid pyrochroite is a typical manganese-containing hydrous mineral, undergoes dehydration reaction at 300 °C to produce pyrolusite (MnO), and undergoes dehydration reaction again to produce Mn203 and release a large amount of water when the temperature rises to 560 °C, high-purity solid chromium hydroxide is a typical greyish-green hydrous solid powdery substance containing chromium, and generally undergoes dehydration reaction at 500 °C to produce green chromium oxide (Cr203) and release a large amount of water at the same time, and all these dehydration temperatures are within a relatively low temperature interval during the process of preparing vanadium-doped single-crystal manganochromite under a high-temperature and high-pressure condition, which fully guarantees that the vanadium-doped singe-crystal manganochromite is in a water environment long enough, LU503654 thus ensuring sufficient diffusion of lattice water of the sample and the formation of lattice sites; second, the pyrochroite and the chromium hydroxide are both manganese-rich and chromium-rich substances, so the manganese activity and the chromium activity can be controlled in the process of preparing vanadium-doped and high-water singe-crystal manganochromite in a sample cavity; and finally, final products of the pyrochroite and the chromium hydroxide with the weight ratio of 4:1, which are used for providing the water source and disposed at two ends of the sample, are oxides such as pyrolusite (MnO), green chromium oxide (Cr203) and manganese oxide, which will not chemically react with the sample, thus ensuring the purity of a prepared vanadium-doped and high-water singe-crystal manganochromite sample. In addition, by adjusting the weight ratio of the pyrochroite and the chromium hydroxide for providing the water source and the height of the corresponding water-source discs, the water content of the vanadium-doped and high-water singe-crystal manganochromite sample can be adjusted.
[0071] Step 24: the pyrochroite powder and the chromium hydroxide powder are cold-pressed on a cold isostatic press by a high-precision ® 4.0 mm (diameter) * 10.0 mm tungsten carbide grinding tool according to the weight ratio of 4:1 to obtain two ® 4.0 mm (diameter) * 0.1 mm (height) water-sourced discs.
[0072] Step 25: the cylindrical manganochromite sample (size: ® 4.0 mm (diameter) * 4.0 mm (height)) and the two water-sourced discs (size: ® 4.0 mm (diameter) * 0.1 (height)) are sequentially sealed in a double-layer experimental sample chamber with an inner tube being a graphite tube (size: ® 4.4 mm (outer diameter) * 4.4 mm (height), 0.2 mm (wall thickness)) and an outer tube being a gold-palladium alloy tube (size: ® 4.6 mm (outer diameter) * 4.6 mm (height), 0.1 mm (wall thickness)). In the present invention, the vanadium-doped singe-crystal manganochromite sample is placed in the middle of the inner graphite tube, the two water-sourced discs prepared from the pyrochroite and the chromium hydroxide with the weight ratio of 4:1 are placed at two symmetrical ends of LU503654 the graphite inner tube close to the sample.
[0073] Step 26: manganochromite is one of the important manganese-rich and chromium-rich oxide minerals in the lower crust and upper mantle of the earth and other terrestrial planets; in order to truly simulate the growth environment of manganochromite deep in the lower crust of the earth and other terrestrial planets and invert the temperature and pressure conditions for stable existence of the manganochromite phase, the double-layer sample chamber composed of the graphite tube and the gold-palladium alloy tube is placed in a typical Kawai-1000t 6-8 multi-anvil, large-volume, high-temperature and high-pressure apparatus, the pressure and temperature are increased to 3.0 GPa and 1080 °C at a rate of 0.5 GPa/h and a rate of 10 °C/min respectively for hot-pressing sintering, and the reaction time is 72 hrs.
[0074] Step 27: after the reaction is performed at 3.0 GPa and 1080 °C for 72 hrs, the temperature in a sample cavity is decreased from 1080 °C to 800 °C at a rate of 3 °C/min, and the temperature is maintained at 800 °C for 1 h; then, the temperature in the sample cavity is decreased from 800 °C to room temperature at a rate of 5 °C/min.
[0075] Step 28: when the temperature in the sample cavity is decreased to room temperature, the pressure in the sample cavity is decreased from 3.0 GPa to normal pressure at a rate of 0.5 GPa. In addition, the process for preparing the vanadium-doped and high-water singe-crystal manganochromite sample through hot-pressing sintering is pure, and the introduction all possible impurities from the sample or generated during high-pressure sample assembly is avoided.
[0076] Step 29: after the high-temperature and high-pressure reaction is completed, the sample is taken out of the typical Kawai-1000t 6-8 multi-anvil, large-volume, high-temperature and high-pressure apparatus. The graphite tube and the gold-palladium alloy tube of the double-layer sample chamber outside the sample are removed carefully,
and the cylindrical sample is cut in the middle with a high-precision diamond wire cutter. LU503654
Single-crystal manganochromite is picked out under a 20-power high-precision Olympus microscope.
Claims (6)
1. A method for preparing vanadium-doped and high-water single-crystal manganochromite under a high-temperature and high-pressure condition, comprising: preparing a cylindrical manganochromite sample using solid roseate trigonal rhombus manganese carbonate crystals, solid chromium(IIT) acetate hydroxide crystalline powder, solid vanadium(IV) oxide acetylacetonate powder, solid oxalic acid, solid pyrochroite powder, solid chromium hydroxide powder and liquid dilute nitric acid as starting materials, preparing two water-sourced discs from the pyrochroite powder and the chromium hydroxide powder according to a weight ratio of 4:1; and placing the two water-sourced discs at two ends of the cylindrical manganochromite sample, and then placing the cylindrical manganochromite sample with the water-sourced discs in a double-layer experimental sample chamber with an inner tube being a graphite tube and an outer tube being a gold-palladium alloy tube for high-temperature and high-pressure reaction to obtain single-crystal manganochromite.
2. The method for preparing vanadium-doped and high-water single-crystal manganochromite under a high-temperature and high-pressure condition according to Claim 1, wherein the purity of the roseate trigonal rhombus manganese carbonate crystals is over 99.99%, the purity of the solid chromium(III) acetate hydroxide crystalline powder is over 99.99%, the purity of the solid vanadium(IV) oxide acetylacetonate powder is over
99.99%, the purity of the solid oxalic acid powder is over 99.99%, the purity of the solid pyrochroite powder is over 99%, the purity of the solid chromium hydroxide powder is 99%, and the concentration of the liquid dilute nitric acid is 10%.
3. The method for preparing vanadium-doped and high-water single-crystal manganochromite under a high-temperature and high-pressure condition according to Claim 1, wherein the cylindrical manganochromite sample is prepared by: Step 1: measuring out 60 ml of dilute nitric acid with the concentration of 10%, and pouring it in a beaker with a notch; LU503654 Step 2: weighing out 5.0 g of solid trigonal rhombus manganese carbonate crystals, adding then into the beaker with the notch, and putting a magnetic stirring rotor in the beaker with the notch; Step 3: covering the beaker with watch-glass, placing the beaker on a high-temperature magnetic stirring heater coil in a fume hood, and reacting for 72 hrs at normal temperature and 700 rpm; Step 4: measuring out 17.4949 g of high-purity solid chromium(III) acetate hydroxide crystalline powder and 135 ml of high-purity solid vanadium(IV) oxide acetylacetonate powder according to manganochromite Mn(Cr,V)2O4 stoichiometry, and adding them to the diluted nitric acid solution in the beaker; Step 5: covering the beaker with the watch-glass; Step 6: placing the beaker on the high-temperature magnetic stirring heater coil in the fume hood, and stirring for 48 hrs at normal temperature and 800 rpm; Step 7: weighing out 2 g of high-purity solid oxalic acid powder, and placing it in the beaker; Step 8: placing the beaker on the high-temperature magnetic stirring heater coil in the fume hood, covering the beaker with the watch-glass, and setting parameters of the high-temperature magnetic stirring heater coil to 80 °C and 1000 rpm for stirring for 36 hrs; Step 9: removing the watch-glass from the beaker, and increasing the temperature of the high-temperature magnetic stirring heater coil to 110 °C until the mixed solution in the beaker is completely desiccated; Step 10: taking the magnetic stirring rotor out of the beaker, stripping sample powder adhering to a surface of the magnetic stirring rotor into the beaker, taking all mixed powder out of the beaker, and placing it in a graphite crucible;
Step 11: increasing the temperature of the graphite crucible containing the mixed powder LU503654 to 1100 °C at a rate of 300 °C/h by means of a muffle furnace which is at normal pressure, and maintaining the graphite crucible at this temperature for 5 hrs; Step 12: cooling the mixed powder in the graphite crucible in the muffle furnace to room temperature at a rate of 200 °C/h; Step 13: grinding the mixed powder in a corundum mortar for 1 h to obtain an experimental powder sample; Step 14: cold-pressing the experimental powder sample into three ® 10.0 mm * 3.0 mm sample discs by a tungsten carbide grinding tool of a stainless steel press, and stacking the three sample discs at a bottom of the graphite crucible from bottom to top Step 15: hanging the graphite crucible in a middle of a high-temperature oxygen atmosphere furnace, connecting and fixing two ends of a platinum-rhodium metal wire of the graphite crucible to a vertical four-hole aluminum oxide tube, and fixing an upper end of the four-hole aluminum oxide tube to a middle of a circular cover capable of being pushed into and pulled out of a furnace body; Step 16: placing a stainless steel container containing secondary deionized pure cold water on one side of the high-temperature oxygen atmosphere furnace; Step 17: connecting a top of the furnace body of the high-temperature oxygen atmosphere furnace to an argon inert gas cylinder and a proportion-adjustable carbon monoxide and carbon dioxide cylinder; Step 18: opening an argon inert gas valve to continuously inject argon for 30 min, and under the protection of the argon, calcinating the sample at high temperature to 800 °C at a heating rate of 400 °C/h; Step 19: when the temperature in the furnace body reaches 800 °C, switching a carbon monoxide and carbon dioxide gas control valve to enable a volume ratio of carbon monoxide and carbon dioxide in the oxygen atmosphere furnace to reach 4:1;
Step 20: increasing the temperature of a sample chamber in the furnace body to 1480 °C at LU503654 a rate of 200 °C/h to perform constant-temperature calcination for 15 min to melt the sample into glassy-state manganochromite; Step 21: after the sample is calcinated at 1480 °C for 15 min, pulling the graphite crucible containing the sample, the four-hole aluminum oxide tube and the circular cover on the furnace body out of the furnace body, and then directly immersing then in the stainless steel container to quench the sample into manganochromite glass; Step 22: taking the manganochromite glass out of the graphite crucible, grinding it into fine-grained and uniform-composition sample powder in the corundum mortar, and drying the sample powder in a vacuum drying oven at 200 °C for 12 hrs; and Step 23: cold-pressing the dried sample powder into a ® 4.0 mm (diameter) * 4.0 mm (height) cylindrical manganochromite sample on a cold isostatic press by a tungsten carbide grinding tool.
4. The method for preparing vanadium-doped and high-water single-crystal manganochromite under a high-temperature and high-pressure condition according to Claim 1, wherein the water-source discs are prepared by: Step 24: cold-pressing the pyrochroite powder and the chromium hydroxide powder on a cold isostatic press by a tungsten carbide grinding tool according to the weight ratio of 4:1 to obtain two ® 4.0 mm (diameter) * 0.1 mm (height) water-sourced discs.
5. The method for preparing vanadium-doped and high-water single-crystal manganochromite under a high-temperature and high-pressure condition according to Claim 1, wherein placing the two water-sourced discs at two ends of the cylindrical manganochromite sample and then placing the cylindrical manganochromite sample with the water-sourced discs in a double-layer experimental sample chamber with an inner tube being a graphite tube and an outer tube being a gold-palladium alloy tube for high-temperature and high-pressure reaction to obtain single-crystal manganochromite comprise: LU503654 Step 25: sealing the cylindrical manganochromite sample and the two water-sourced discs in the double-layer experimental sample chamber with the inner tube being the graphite tube and the outer tube being the gold-palladium alloy tube, placing the cylindrical manganochromite sample in a middle of the inner graphite tube, and placing the water-sourced discs at two symmetrical ends of the inner graphite tube close to the sample; Step 26: placing the double-layer sample chamber in a typical Kawai-1000t 6-8 multi-anvil, large-volume, high-temperature and high-pressure apparatus, and increasing the pressure and temperature to 3.0 GPa and 1080 °C at a rate of 0.5 GPa/h and a rate of °C/min respectively for hot-pressing sintering, and reacting at constant temperature and constant pressure for 72 hrs; Step 27: after reacting at constant temperature and constant pressure for 72 hrs, decreasing the temperature in a sample cavity from 1080 °C to 800 °C at a rate of 3 °C/min, and maintaining the temperature for 1h; then, decreasing the temperature in the sample cavity from 800 °C to room temperature at a rate of 5 °C/min; Step 28: when the temperature in the sample cavity is decreased to room temperature, decreasing the pressure in the sample cavity from 3.0 GPa to normal pressure at a rate of
0.5 GPa; and Step 29: taking the sample out of the typical Kawai-1000t 6-8 multi-anvil, large-volume, high-temperature and high-pressure apparatus, removing the graphite tube and the gold-palladium alloy tube of the double-layer sample chamber outside the sample, cutting the cylindrical sample in the middle with a diamond wire cutter, and picking out single-crystal manganochromite under a 20-power high-precision Olympus microscope.
6. The method for preparing vanadium-doped and high-water single-crystal manganochromite under a high-temperature and high-pressure condition according to
Claim 1, wherein during the high-temperature and high-pressure reaction, two sets of LU503654 high-temperature tungsten-rhenium thermocouples are used for temperature calibration;
each of the two sets of tungsten-rhenium thermocouples is composed of two tungsten-rhenium alloy wires made of different materials, the chemical composition of which is W95%Re5% and W74%Re26%; and the two sets of tungsten-rhenium thermocouples are symmetrically disposed at an upper end and a lower end of the double-layer sample chamber composed of the graphite tube and the gold-palladium alloy tube.
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| CN202211626670.5A CN115874265A (en) | 2022-12-16 | 2022-12-16 | Preparation method of vanadium-doped high-water-content ferromanganese-chromite single crystal at high temperature and high pressure |
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| LU (1) | LU503654B1 (en) |
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