WO2006070855A1 - 結晶性制御酸化マグネシウム単結晶及びその製造方法並びにその単結晶を用いた基板 - Google Patents
結晶性制御酸化マグネシウム単結晶及びその製造方法並びにその単結晶を用いた基板 Download PDFInfo
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- WO2006070855A1 WO2006070855A1 PCT/JP2005/024027 JP2005024027W WO2006070855A1 WO 2006070855 A1 WO2006070855 A1 WO 2006070855A1 JP 2005024027 W JP2005024027 W JP 2005024027W WO 2006070855 A1 WO2006070855 A1 WO 2006070855A1
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- single crystal
- crystallinity
- mgo single
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- substrate
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- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 153
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 135
- 239000013078 crystal Substances 0.000 title claims abstract description 121
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 title claims abstract description 119
- 239000000758 substrate Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims description 25
- 238000005259 measurement Methods 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims description 51
- 238000001816 cooling Methods 0.000 claims description 45
- 239000010409 thin film Substances 0.000 claims description 31
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims 2
- 229910052749 magnesium Inorganic materials 0.000 claims 2
- 239000011777 magnesium Substances 0.000 claims 2
- 239000002253 acid Substances 0.000 claims 1
- 239000002994 raw material Substances 0.000 description 35
- 239000002887 superconductor Substances 0.000 description 26
- 230000000052 comparative effect Effects 0.000 description 12
- 239000007789 gas Substances 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 238000005498 polishing Methods 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000007500 overflow downdraw method Methods 0.000 description 5
- 239000000523 sample Substances 0.000 description 5
- 230000003746 surface roughness Effects 0.000 description 5
- 239000011575 calcium Substances 0.000 description 4
- 239000010408 film Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000004544 sputter deposition Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 239000013077 target material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- 229910015901 Bi-Sr-Ca-Cu-O Inorganic materials 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910002483 Cu Ka Inorganic materials 0.000 description 1
- 229910002480 Cu-O Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000002109 crystal growth method Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000001552 radio frequency sputter deposition Methods 0.000 description 1
- 238000001028 reflection method Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 210000003625 skull Anatomy 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000005477 sputtering target Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000005469 synchrotron radiation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004876 x-ray fluorescence Methods 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
- 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
-
- 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
-
- 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
- C30B33/00—After-treatment of single crystals or homogeneous polycrystalline material with defined structure
- C30B33/02—Heat treatment
Definitions
- the present invention relates to a magnesium oxide (MgO) single crystal having controlled crystallinity, a method for producing the same, an MgO single crystal substrate obtained from the crystallinity-controlled MgO single crystal, and the MgO single crystal substrate
- the present invention relates to a superconducting device using
- MgO single crystals produce oxide superconductor thin film substrates, oxide dielectric thin film substrates, high thermal conductivity substrates, optical lenses, infrared transmission window materials, plasma display panel (PDP) protective films, etc. It is used in a wide range of applications, such as vapor deposition and sputtering target materials.
- MgO single crystals have good lattice matching with oxide superconductors, have the same coefficient of thermal expansion, and have a low dielectric constant, which makes oxide superconductors used in high-frequency devices. In recent years, it has attracted attention as a substrate for body thin films.
- this MgO single crystal has a high vapor pressure of MgO, it is generally produced by an arc fusing method.
- the arc fusion method is a method in which an electrode is inserted into a magnesia clinker as a raw material to melt the raw material, a skull layer is formed from the molten raw material, and the raw material melt is retained by crystallization and crystallized. .
- the arc fusing method has a problem that it is difficult to control the growth conditions of the single crystal, and it is difficult to obtain a single crystal of a large size.
- Patent Document 1 a method of producing a large-sized MgO single crystal by stabilizing powder-like magnesia on the raw material magnesia clinker layer and stabilizing the sealing property and temperature in the electric furnace.
- Patent Document 2 a method of manufacturing a large-sized MgO single crystal by densely filling a furnace with a high-purity raw material having a magnesia purity of 99.8% or more.
- arc fusing is a conventional single crystal growth method such as pulling in the first place. Unlike the method, it is not a method of sequentially growing single crystals on the seed crystal, so there is a problem that fundamentally good crystallinity and large size single crystals are difficult to obtain.
- Patent Document 4 a method of treating the substrate surface with weakly acidic cleaning water adjusted to a specific pH (Patent Document 4), after the removal step of polishing the substrate surface A method of heat treatment (Patent Document 5) and a method of improving the surface smoothness of MgO single crystal substrates by specifying the contents of calcium (Ca) and silicon (Si) (Patent Document 6). Proposed.
- Patent Document 1 Japanese Patent Laid-Open No. 02-263794
- Patent Document 2 JP 05-170430 A
- Patent Document 3 Japanese Patent Laid-Open No. 06-305887
- Patent Document 4 Japanese Patent Laid-Open No. 09-309799
- Patent Document 5 JP 2000-86400 A
- Patent Document 6 Japanese Patent Laid-Open No. 11-349399
- An object of the present invention is to solve the above-mentioned problems, and in particular, to provide a MgO single crystal with controlled crystallinity, which can be a suitable substrate for forming an oxide superconductor thin film, and a method for producing the same. In addition, it is to provide a superconducting device in which a superconductor thin film is formed on this MgO single crystal substrate.
- the inventors of the present invention have made various studies in order to achieve the above-described object, the inventors have focused on the crystallinity inside the region surrounded by the sub-boundary of the MgO single crystal and specified the fluctuation of the diffraction line position. It was found that the crystallinity-controlled MgO single crystal can exhibit excellent performance as a substrate for a superconductor thin film.
- the MgO single crystal produced in advance by an arc fusion method is subjected to a heat treatment under specific conditions, thereby producing a crystallinity. It was found that can be controlled.
- the fluctuation range of the diffraction line coordinate position by the reciprocal lattice map measurement at the same sub-boundary has a sub-boundary.
- a crystallinity-controlled MgO single crystal having 10 _3 to 2 X 10 _2 degrees and a variation range of 2 ⁇ coordinates of 4 X 10 _4 to 5 X 10 _3 degrees is provided.
- the crystallinity-controlled MgO single crystal substrate obtained from the above-described crystallinity-controlled MgO single crystal, and the substance having superconducting properties on the crystallinity-controlled MgO single crystal substrate There is provided a superconducting device in which a thin film is formed.
- the present invention after producing an MgO single crystal, after heating up to a temperature of 2613K or higher, immediately or after holding at that temperature for a predetermined time, at a cooling rate of 50 to 300KZhr. Including a step of cooling to 2473 K, and further, a heat treatment is performed to reduce the total time of holding in a temperature range of 2613 K or higher, including the time required for temperature rise and cooling, to 10800 seconds or less MgO A method for producing a single crystal is also provided.
- FIG. 1 is a diagram for explaining a measurement position for evaluating crystallinity within a sub-boundary of a crystallinity controlled MgO single crystal of the present invention.
- FIG. 2 is a diagram for explaining a measurement example of a reciprocal lattice map and a coordinate position for giving a maximum intensity.
- FIG. 3 is a diagram showing coordinate positions and fluctuation ranges that give the maximum strength at five locations within the same subgrain boundary.
- the crystallinity-controlled MgO single crystal of the present invention has a sub-boundary, and the fluctuation width force of the diffraction line coordinate position by reciprocal lattice map measurement at the same sub-grain boundary 2
- the fluctuation width of the ⁇ coordinate as, 4 X 10 _4 ⁇ 5 X 10 _3 degree, and, as the fluctuation width of the delta omega coordinates, and serves as a 1 ⁇ 10 _3 ⁇ 2 ⁇ 10 one 2 degree.
- the number of subgrain boundaries is not limited, but is usually 1 to 5 ⁇ 10 6 Zm 2 .
- the variation range of the 2 ⁇ coordinate indicates the degree of variation of the lattice spacing. 2
- the variation range of the ⁇ coordinate is in the above range, it affects the crystallinity of the oxide superconductor formed on this substrate, especially when used as a substrate for an oxide superconductor thin film. In addition, the excellent effect as a pinning center can be exhibited.
- the fluctuation range of the ⁇ coordinate indicates the degree of fluctuation of the lattice plane orientation.
- the fluctuation range of the ⁇ coordinate is in the above range, especially when used as a substrate for an oxide superconductor thin film, the crystal of the oxide superconductor thin film formed on this substrate It is possible to maintain the high superconducting properties by acting as a pin-jung center.
- the crystallinity controlled MgO single crystal of the present invention can be used for various applications. Specifically, it is useful as a substrate for forming a superconductor thin film, a ferroelectric thin film, etc. In particular, when used as a substrate for a superconductor thin film, the superconducting characteristics of the formed superconductor thin film are useful. If the property is remarkably improved, the excellent effect is exhibited.
- the crystallinity-controlled MgO single crystal of the present invention is obtained by controlling the microscopic crystallinity in the sub-boundary within a specific range, but the crystallinity of the adjacent sub-boundary is extremely uniform. It is also useful as an optical lens and infrared window material.
- a method for producing the crystallinity controlled MgO single crystal of the present invention will be described.
- a raw material MgO single crystal that is a starting material for the crystallinity-controlled MgO single crystal of the present invention is produced.
- the production method of the raw material MgO single crystal is not particularly limited, but it is preferable to produce it by an arc fusion method.
- a process for producing a raw material MgO single crystal using the arc fusing method will be described.
- a magnesia clinker layer is formed by inserting a seawater-based magnesia clinker having a predetermined composition into an electric furnace in which a powerful Bonn electrode is embedded.
- a magnesia powder layer having a particle size adjusted in advance is charged from above to form a magnesia powder layer. Subsequently, the carbon electrode is energized to melt the magnesia powder, and then cooled to control the crystallinity to obtain a raw material MgO single crystal.
- the raw material MgO single crystal thus obtained can be subjected to a heat treatment as a feature of the present invention to obtain a crystallinity-controlled MgO single crystal having desired crystallinity. Specifically, this heat treatment is performed as follows.
- the raw material MgO single crystal is placed in a crucible made of carbon, for example, and charged into a closed carbon resistance heating furnace.
- the inside of the furnace is preferably vacuum degassed and then pressurized to 0.2 to 2 OMPa with an inert gas.
- the inert gas argon (Ar), helium (He), and a mixed gas thereof can be used.
- the temperature inside the furnace is raised to a predetermined heat treatment temperature of 2613K or higher.
- the heating rate at this time is not particularly limited, but is usually 100 to 900 KZhr, and more preferably 300 to 700 KZhr.
- the heat treatment temperature is less than 2613K, the crystallinity of the MgO single crystal hardly changes, and it is difficult to control the desired crystallinity by introducing the variation of the lattice plane inside the sub-grain boundary. It is.
- the higher the heat treatment temperature the higher the power to improve the crystallinity control effect. If the temperature is excessively high, the total time of holding in the temperature range above 2613K including the temperature rise time and the cooling time becomes longer. On the other hand, since the fluctuation progresses, the fluctuation range of the ⁇ coordinate may be excessively reduced.
- the preferable heat treatment temperature is 2673 to 2913K, and more preferably 2723 to 2873 ⁇ .
- cooling is started immediately or held at that temperature for a predetermined time. At this time, set the total time to be kept in the temperature range of 2613K or higher including the heating time and cooling time to 10800 seconds or less.
- This heat treatment temperature If the holding time is too long, the variation in crystallinity proceeds too much, and the variation range of the ⁇ coordinate may deviate from the desired range force.
- This heat treatment time is preferably 1200 to 9000 seconds, and more preferably 3600 to 8100 seconds.
- the temperature range for controlling the cooling rate is a temperature range from the heat treatment temperature to 2273 ⁇ or less, preferably a temperature range from the heat treatment temperature to 2473 ⁇ , particularly a temperature range from 2613 to 2473 ⁇ .
- the cooling rate is controlled in the range of 50 to 300 KZhr.
- the cooling rate is controlled within this range for the following reasons.
- the strain due to the stress is absorbed as a change in lattice plane orientation (variation width of ⁇ coordinate), and a change in lattice plane spacing (2 ⁇ ) (variation of 2 ⁇ coordinate). Width) is not introduced.
- the cooling rate exceeds 300 mm, the fluctuation of the lattice spacing inside the subgrain boundary increases, making it difficult to control the fluctuation range of the 2 ⁇ coordinate within the aforementioned range.
- a preferable range of the cooling rate is 60 to 250 KZhr, and more preferably 80 to 200 KZhr.
- many sub-boundaries are formed in addition to the stress force single crystal generated by the difference in thermal shrinkage during cooling.
- the cooling rate is remarkably reduced, and it becomes difficult to control the cooling rate to a desired level.
- the fluctuation range of the diffraction line coordinate position by the reciprocal lattice map measurement within the same sub-boundary is obtained.
- the plane spacing 2 ⁇ and the lattice plane orientation ⁇ ⁇ are controlled within a predetermined range, and as a result, the crystallinity can be controlled and desired characteristics can be exhibited.
- the crystallinity-controlled MgO single crystal of the present invention thus obtained is a substrate for an oxide superconductor thin film, a substrate for an oxide dielectric thin film, a high thermal conductivity substrate, an optical lens, and an infrared transmission device.
- magnesia clinker layer having a thickness of 1.3 m.
- powdery magnesia 2t whose particle size was adjusted in advance to 30 to 390 mesh was added from the top of the electric furnace to form a 0.2 m thick magnesia powder layer.
- the carbon electrode embedded in the electric furnace was energized for 40 hours (equivalent to 14000kWH power) and melted. As a result, about 100 mm x 100 mm x 100 mm of raw material MgO single crystal A was obtained. Several were obtained.
- the above raw material MgO single crystal A In the same manner as above, MgO single crystals were produced, and a plurality of raw material MgO single crystals B of about 90 mm ⁇ 90 mm ⁇ 90 mm were obtained.
- the thickness of the magnesia clinker layer is 1.4 m and the thickness of the magnesia powder layer is 0.1 lm.
- the carbon crucible containing the raw material MgO single crystal A obtained as described above was placed in a closed carbon resistance heating furnace, the inside of the furnace was vacuum degassed, and then pressurized to 0.5 MPa with Ar gas, and then 30 After the temperature was raised to 1773K per minute, the temperature was further raised to 2723K at a heating rate of 600KZhr. After holding at this temperature for 600 seconds (heat treatment temperature holding time), it was cooled to 2473K (cooling control temperature) at the cooling rate of lOOKZhr, and then cooled to room temperature over 14 hours.
- the crystallinity control MgO single crystal was performed by heat treatment in the same manner as in Example 1 except that the gas was pressurized to 0.9 MPa with Ar gas, heated to 2873 K, and cooled to 2473 K at a cooling rate of 150 KZhr. A crystal substrate was obtained.
- the raw material MgO single crystal C was used, and the pressure was 0.6 MPa with Ar gas. Then, heat treatment was performed to obtain a crystallinity controlled MgO single crystal substrate.
- Example 5 The crystallinity controlled MgO single crystal substrate was obtained by performing the heat treatment in the same manner as in Example 4 except that the holding time after the temperature increase in the heat treatment was 300 seconds, and the sample was cooled to 2273 K at a cooling rate of 80 KZhr. .
- the heat treatment was performed in the same manner as in Example 4 except that the holding time after the temperature increase in the heat treatment was 2400 seconds and the cooling rate was 2073 K at the cooling rate of lOOKZhr to obtain a crystallinity controlled MgO single crystal substrate. It was.
- the crystallinity control MgO single crystal A substrate was obtained.
- the heat treatment was performed in the same manner as in Example 4 except that the holding time after the temperature increase in the heat treatment was 18000 seconds and the sample was cooled to 2073 K at a cooling rate of 80 KZhr to obtain a crystallinity controlled MgO single crystal substrate. It was.
- a crystallinity-controlled MgO single crystal substrate was obtained in the same manner as in Example 4 except that the temperature was controlled to 80 KZhr, cooled to 2573 K, and then gradually cooled to 2073 K at 30 KZhr.
- a crystallinity-controlled MgO single crystal substrate was obtained by performing heat treatment in the same manner as in Example 1 except that the pressure was increased to 1.8 MPa with Ar gas and the temperature was raised to 2943 K.
- Comparative Example 7 A heat treatment was performed in the same manner as in Example 6 except that the holding time after the temperature increase in the heat treatment was 4800 seconds, and a crystallinity controlled MgO single crystal substrate was obtained.
- the crystallinity fluctuation range of the crystalline uncontrolled MgO single crystal substrate shown in Table 1 is the same as that of the raw material MgO single crystal before heat treatment, and the crystallinity controlled MgO single crystal The range of variation in crystallinity of the substrate is the same as that of the raw material MgO single crystal after heat treatment.
- X-rays were Cu-Ka lines and MgO (400) diffraction lines.
- the measurement sample was set by a conventional half-spinning operation, a reciprocal lattice map measurement was performed.
- the measurement position select an arbitrarily large grain boundary from the topographic image measured in advance, and as shown in Fig. 1, the grain boundary center ( ⁇ ) is at an arbitrary distance of 200 ⁇ 10 _6 m or more in the perpendicular and parallel directions.
- a total of five points (B to E) were evaluated.
- all points where the grain boundary force was at least 100 X 10 _6 m or more were selected.
- X-ray used for measurement the wavelength 0. 82656 X 10 _10 m, height 3. 7 X 10 _6 m, width 2. 5 X 10 _ 6 m, the parallel micro beam divergence angle 0. 0014Degree Using.
- This X-ray can be used in the large synchrotron radiation facility SPring-8BL24-C2 hatch.
- MgO (400) is used as the diffraction surface, and 2 ⁇ is 46.ldegree.
- Diffracted light is Si (111)
- the sample was detected with a scintillation counter after passing through a crystal monochromator and an RS slit with a width of 1 ⁇ 10 _3 m each.
- the reciprocal lattice map measurement uses the 20- ⁇ radial step scan method.
- the 0 _4 degree step, ⁇ was measured in 1 X 10 _4 degree steps.
- the reciprocal space coordinates that give the maximum intensity in the reciprocal space are determined as 20 and ⁇ coordinates, respectively.
- the absolute value of the difference between the minimum value and the minimum value is defined as the fluctuation range of the diffraction line coordinate position in the subgrain boundary.
- Fig. 2 shows a measurement example of the reciprocal lattice map and the coordinate position that gives the maximum intensity
- Fig. 3 shows the coordinate position and the fluctuation range that give the maximum intensity at 5 points from ⁇ to ⁇ ⁇ ⁇ ⁇ in Fig. 1, for example. It is a figure.
- Cooling speed of 2773 ⁇ 2573K, cooling speed of 2573 ⁇ 2073K is 30K / hr
- the superconducting thin film formed on the MgO single crystal substrate obtained from the MgO single crystal after the heat treatment is composed of the uncontrolled MgO single crystal obtained from the raw material MgO single crystal before the heat treatment. It was confirmed that the superconducting properties were significantly improved compared to the superconducting thin film formed on the substrate. This is because fluctuations in lattice spacing and lattice orientation within the same grain boundary act as a pinning center for the oxide superconductor thin film formed on it, and the superconducting properties have been dramatically improved. Inferred.
- the crystallinity controlled MgO single crystal of the present invention specifies the fluctuation range of the diffraction line coordinate position of the reciprocal lattice map by intentionally controlling the crystallinity. .
- the superconducting properties of the oxide superconductor thin film can be remarkably improved.
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Abstract
Description
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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CN2005800453528A CN101094940B (zh) | 2004-12-28 | 2005-12-28 | 结晶性被控制的氧化镁单晶及其制造方法以及使用该单晶的基板 |
US11/722,921 US7544345B2 (en) | 2004-12-28 | 2005-12-28 | Magnesium oxide single crystal having controlled crystallinity and method for producing the same |
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JP2004-380169 | 2004-12-28 | ||
JP2004380169A JP4686181B2 (ja) | 2004-12-28 | 2004-12-28 | 結晶性制御酸化マグネシウム単結晶及びその製造方法並びにその単結晶を用いた基板 |
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JP (1) | JP4686181B2 (ja) |
KR (1) | KR100883228B1 (ja) |
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JP4926835B2 (ja) * | 2007-06-05 | 2012-05-09 | タテホ化学工業株式会社 | 酸化マグネシウム粉末 |
KR101691287B1 (ko) * | 2015-03-13 | 2016-12-29 | (주) 보람케메탈 | 마그네시아 단결정 제조장치 및 그 제조방법 |
JP6515791B2 (ja) * | 2015-11-26 | 2019-05-22 | 株式会社Sumco | シリコン単結晶の製造方法 |
JP2017122588A (ja) | 2016-01-05 | 2017-07-13 | 株式会社トクヤマ | 酸化マグネシウムを用いた線量計 |
Citations (2)
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JPH06305887A (ja) * | 1993-04-23 | 1994-11-01 | Kurosaki Refract Co Ltd | MgO単結晶基板 |
JP2000086400A (ja) * | 1998-09-09 | 2000-03-28 | Inst Of Physical & Chemical Res | 酸化物単結晶基板の製造方法、及び電子デバイス |
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US3634033A (en) * | 1970-06-10 | 1972-01-11 | Atomic Energy Commission | Method for the production of single crystals |
JPH02263794A (ja) | 1989-03-31 | 1990-10-26 | Tateho Chem Ind Co Ltd | 電融マグネシアの製造方法 |
JP3264508B2 (ja) | 1991-12-26 | 2002-03-11 | 黒崎播磨株式会社 | マグネシア単結晶の製造方法 |
JPH09309799A (ja) | 1996-05-22 | 1997-12-02 | Sumitomo Metal Ind Ltd | MgO単結晶基板の表面処理方法 |
JPH11349399A (ja) | 1998-06-05 | 1999-12-21 | Daiichi Kigensokagaku Kogyo Co Ltd | マグネシア単結晶基板及びマグネシア単結晶 |
-
2004
- 2004-12-28 JP JP2004380169A patent/JP4686181B2/ja active Active
-
2005
- 2005-12-28 US US11/722,921 patent/US7544345B2/en active Active
- 2005-12-28 KR KR1020077015203A patent/KR100883228B1/ko active IP Right Grant
- 2005-12-28 WO PCT/JP2005/024027 patent/WO2006070855A1/ja not_active Application Discontinuation
- 2005-12-28 CN CN2005800453528A patent/CN101094940B/zh active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06305887A (ja) * | 1993-04-23 | 1994-11-01 | Kurosaki Refract Co Ltd | MgO単結晶基板 |
JP2000086400A (ja) * | 1998-09-09 | 2000-03-28 | Inst Of Physical & Chemical Res | 酸化物単結晶基板の製造方法、及び電子デバイス |
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KR100883228B1 (ko) | 2009-02-18 |
US7544345B2 (en) | 2009-06-09 |
CN101094940B (zh) | 2010-05-26 |
US20080081767A1 (en) | 2008-04-03 |
JP4686181B2 (ja) | 2011-05-18 |
JP2006182620A (ja) | 2006-07-13 |
KR20070098841A (ko) | 2007-10-05 |
CN101094940A (zh) | 2007-12-26 |
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