CN113105227A - Textured Z-shaped Ba0.52Sr2.48Co2Fe24O41Preparation method of hexagonal ferrite - Google Patents
Textured Z-shaped Ba0.52Sr2.48Co2Fe24O41Preparation method of hexagonal ferrite Download PDFInfo
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- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title description 2
- 239000002002 slurry Substances 0.000 claims abstract description 47
- 239000000463 material Substances 0.000 claims abstract description 44
- 239000000843 powder Substances 0.000 claims abstract description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 23
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 23
- 239000008367 deionised water Substances 0.000 claims abstract description 22
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 22
- 238000000227 grinding Methods 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 17
- 239000000956 alloy Substances 0.000 claims abstract description 17
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000000137 annealing Methods 0.000 claims abstract description 15
- 238000002360 preparation method Methods 0.000 claims abstract description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 13
- BDAGIHXWWSANSR-NJFSPNSNSA-N hydroxyformaldehyde Chemical compound O[14CH]=O BDAGIHXWWSANSR-NJFSPNSNSA-N 0.000 claims abstract description 13
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 13
- 239000001301 oxygen Substances 0.000 claims abstract description 13
- 229910000018 strontium carbonate Inorganic materials 0.000 claims abstract description 13
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 238000003825 pressing Methods 0.000 claims abstract description 10
- 235000015895 biscuits Nutrition 0.000 claims abstract description 7
- 238000005245 sintering Methods 0.000 claims abstract description 5
- 229910000428 cobalt oxide Inorganic materials 0.000 claims abstract description 3
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000002131 composite material Substances 0.000 claims abstract description 3
- 238000003837 high-temperature calcination Methods 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims abstract description 3
- 239000002994 raw material Substances 0.000 claims abstract description 3
- 238000001354 calcination Methods 0.000 claims description 24
- UBEWDCMIDFGDOO-UHFFFAOYSA-N cobalt(2+);cobalt(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Co+2].[Co+3].[Co+3] UBEWDCMIDFGDOO-UHFFFAOYSA-N 0.000 claims description 20
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 10
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 claims description 4
- 230000035484 reaction time Effects 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- 230000008878 coupling Effects 0.000 abstract description 11
- 238000010168 coupling process Methods 0.000 abstract description 11
- 238000005859 coupling reaction Methods 0.000 abstract description 11
- 238000001816 cooling Methods 0.000 description 8
- 239000013078 crystal Substances 0.000 description 8
- 230000003993 interaction Effects 0.000 description 4
- 230000010287 polarization Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000001808 coupling effect Effects 0.000 description 2
- 230000005302 magnetic ordering Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005621 ferroelectricity Effects 0.000 description 1
- 230000005307 ferromagnetism Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
- C04B35/2608—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead
- C04B35/2633—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead containing barium, strontium or calcium
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- B28—WORKING CEMENT, CLAY, OR STONE
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Abstract
The invention discloses a textured Z-shaped Ba0.52Sr2.48Co2Fe24O41The preparation method of the hexagonal ferrite comprises the steps of uniformly mixing, grinding and tabletting raw materials of barium carbonate, strontium carbonate, cobalt oxide and iron oxide in a certain stoichiometric ratio, and then placing the mixture in a box-type furnace for high-temperature calcination to obtain a composite phase A; placing the phase A in a tube furnace, and annealing in a flowing oxygen atmosphere to obtain a sample B; grinding the sample B into powder, and taking a certain amount of powder to disperse in polyvinyl alcohol andpreparing slurry in a premixed solution of deionized water, transferring the slurry into an alloy mold, and after treating for a period of time under the condition of a magnetic field, applying pressure to mold the slurry to obtain a biscuit sample C; removing the magnetic field, taking out the sample C, and sintering at high temperature in a box furnace to obtain textured Ba0.52Sr2.48Co2Fe24O41A material. Textured Ba prepared by the invention0.52Sr2.48Co2Fe24O41When the material is used for a single-phase multiferroic material, the material has the remarkable advantages of high magnetoelectric coupling temperature and high coupling strength.
Description
Technical Field
The invention relates to a textured Z-shaped Ba0.52Sr2.48Co2Fe24O41A preparation method of hexagonal ferrite belongs to the technical field of magnetoelectric multiferroic materials.
Background
Professor Schmid, geneva university, switzerland, refers to materials that have two or more basic ferrosofacies (e.g., ferromagnetism, ferroelectricity, and ferroelasticity) simultaneously as multiferroics. In the multiferroic material, the regulation and control of sample magnetization by an electric field or sample electric polarization by a magnetic field, namely, the magnetoelectric coupling effect, is a basic guarantee for developing a new concept magnetic storage technology, a four-state logic memory and other multifunctional devices. For example, magnetic recording has a fast reading speed and a slow writing speed, while ferroelectric recording has a complex reading speed and a fast writing speed, and if a multiferroic material is used as a recording storage medium, the electric writing and magnetic reading of data storage can be realized, and the sub-nanosecond overturning speed and the writing operation driven by ultra-low power voltage can be achieved, so that the energy consumption of the device is reduced, and the miniaturization of the device is realized. In the aspect of basic research, the microscopic mechanism of coexistence of magnetic order and ferroelectric order and mutual coupling between two order parameters in the multiferroic material is always a hot spot of condensed state physical and material scientific research.
In strongly related oxide systems, multiple competing interactions complicate the physical problem, often involving magnetic interactions. Competition for magnetic interactions will lead to various odd spin structures, such as those that can break the symmetry of the spatial inversion, including collinear spin sequences and non-collinear spin sequences arranged as dominant in ↓ ↓ ↓ ↓ ↓ ↓. The competition of magnetic interactions leads on the one hand to the generation of special spin orders and on the other hand also to spin frustration. The ferroelectric polarization thus produced is also weak and the magnetic ordering temperature is unlikely to be very high, given that the non-collinear spin ordering results from the mutual competition of spin artefacts. If the stability of the non-collinear spin order can be greatly improved, strong polarization and high Curie temperature can be expected. The hexagonal ferrite has a long-wavelength spiral magnetic structure, a magnetic ordering temperature higher than room temperature, an electric polarization behavior regulated by a low magnetic field, and even a room-temperature magnetoelectric coupling effect is found in some systems, so that the hexagonal ferrite is a multiferroic material with very high application potential.
The Z-type hexaferrite Ba currently involved0.52Sr2.48Co2Fe24O41Multiferroic studies are mainly in single crystal materials. However, the preparation of the Z-type hexaferrite single crystal material is difficult and expensive, and is not suitable for large-scale production and application.
Disclosure of Invention
Aiming at the problems, the invention researches a textured Z-type Ba0.52Sr2.48Co2Fe24O41The preparation method of the hexagonal ferrite enables original disordered crystal grains in the polycrystalline material to be rearranged in a reorientation mode, achieves high texturing, obtains performance similar to single crystal, and remarkably reduces the preparation cost of the material, thereby being beneficial to the practical application of the material.
In order to achieve the above object, the present invention provides a textured Z-type Ba0.52Sr2.48Co2Fe24O41The preparation method of the hexagonal ferrite comprises the following steps:
step one, uniformly mixing, grinding and tabletting raw materials of barium carbonate, strontium carbonate, cobalt oxide and iron oxide in a certain stoichiometric ratio, and then placing the mixture in a box-type furnace for high-temperature calcination to obtain a composite phase A;
step two, placing the phase A in a tube furnace, and annealing in a flowing oxygen atmosphere to obtain a sample B;
grinding the sample B into powder, dispersing a certain amount of powder in a premixed solution of polyvinyl alcohol and deionized water to prepare slurry, transferring the slurry into an alloy die, and after the slurry is treated for a period of time under the condition of a magnetic field, applying pressure to mold the slurry to obtain a biscuit sample C;
step four, removing the magnetic field, taking out the sample C, and placing the sample C in a box furnace for high-temperature sintering treatment to obtain the textureDissolving Ba0.52Sr2.48Co2Fe24O41A material.
Further, in the first step, the ratio of barium carbonate: strontium carbonate: cobaltosic oxide: the molar ratio of ferric oxide is 0.078: 0.372: 0.1: 1.8.
further, in the first step, the calcining temperature after tabletting is 1000-1300 ℃, and the calcining time is 16-20 h.
Further, in the second step, the annealing temperature is 800-950 ℃ in an oxygen atmosphere, and the annealing time is 24-72 hours.
Further, in the third step, the mass ratio of the polyvinyl alcohol to the deionized water in the premixed liquid is 1:1 to 10.
Furthermore, in the third step, the alloy mold can rotate along the central axis thereof under a magnetic field, the direction of the external magnetic field is kept to be always vertical to the central axis of the mold, the magnetic field intensity is 0.5-2T, and the reaction time of the slurry under the magnetic field is 1-15 min.
Further, in the third step, the alloy mold is fixed in a magnetic field environment, the direction of an external magnetic field is always perpendicular to the central axis of the mold, the magnetic field strength is 0.5-2T, and the reaction time of slurry under the magnetic field is 1-15 min.
Further, in the fourth step, the sintering temperature of the biscuit is 1000-1200 ℃, and the calcination time is 10-24 h.
The invention has the beneficial effects that: adopting magnetic field biscuit molding, and preparing textured Ba by controlling the calcining temperature and time, the mass ratio of polyvinyl alcohol to deionized water in the premixed solution, the rotation degree of the mold in a magnetic field, the magnetic field intensity and the processing time0.52Sr2.48Co2Fe24O41A material; when the textured material is used for a single-phase multiferroic material, the textured material has the remarkable advantages of high magnetoelectric coupling temperature and high coupling strength; has more prominent preferred orientation and higher crystal orientation factor, and the multiferroic performance of the material is comparable to that of a single crystal material. Therefore, when the textured material is used for room-temperature multiferroic materials, the textured material has the advantages of easiness in synthesis, low cost, high magnetoelectric coupling strength and high coupling temperature.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 shows the preparation of textured Z-type Ba in the present invention0.52Sr2.48Co2Fe24O41Flow chart of hexaferrite.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Uniformly mixing 0.00078 mol of barium carbonate, 0.00372 mol of strontium carbonate, 0.001 mol of cobaltosic oxide and 0.018 mol of ferric oxide, grinding, tabletting, and calcining at 1300 ℃ in a high-temperature box furnace for 16 h; then placing the sintered sample in a tubular furnace, and carrying out annealing treatment at 900 ℃ for 48 h in a flowing oxygen atmosphere; grinding the annealed block into powder, taking 3g of the powder, dispersing the powder in a premixed solution of polyvinyl alcohol and deionized water, wherein the mass ratio of the polyvinyl alcohol to the deionized water is 1:1, preparing slurry, pouring the slurry into an alloy mold, wherein the mold can rotate along the central axis of the mold under a magnetic field, and the magnetic field intensity is 0.5T; after the slurry reacts for 10 min under the magnetic field, applying pressure to form the slurry; finally removing the magnetic field, demoulding, calcining at 1100 ℃ for 16 h in a box-type furnace, and cooling to room temperature to obtain Ba0.52Sr2.48Co2Fe24O41A material.
Example 2
Uniformly mixing 0.00078 mol of barium carbonate, 0.00372 mol of strontium carbonate, 0.001 mol of cobaltosic oxide and 0.018 mol of ferric oxide, grinding, tabletting, and calcining at 1300 ℃ in a high-temperature box furnace for 16 h; then placing the sintered sample in a tubular furnace, and carrying out annealing treatment at 800 ℃ for 72 h in a flowing oxygen atmosphere; grinding the annealed block into powder, taking 3g of the powder, dispersing the powder in a premixed solution of polyvinyl alcohol and deionized water, wherein the mass ratio of the polyvinyl alcohol to the deionized water is 1:2, preparing slurry, pouring the slurry into an alloy mold, wherein the mold can rotate along the central axis of the mold under a magnetic field, and the magnetic field intensity is 1T; after the slurry reacts for 15 min under the magnetic field, applying pressure to form the slurry; finally removing the magnetic field, demoulding, calcining at 1000 ℃ for 24h in a box-type furnace, cooling to room temperature to obtain Ba0.52Sr2.48Co2Fe24O41A material.
Example 3
Uniformly mixing 0.00078 mol of barium carbonate, 0.00372 mol of strontium carbonate, 0.001 mol of cobaltosic oxide and 0.018 mol of ferric oxide, grinding, tabletting, and calcining at 1200 ℃ in a high-temperature box type furnace for 20 hours; then placing the sintered sample in a tubular furnace, and carrying out annealing treatment at 800 ℃ for 48 h in a flowing oxygen atmosphere; grinding the annealed block into powder, taking 3g of the powder, dispersing the powder in a premixed solution of polyvinyl alcohol and deionized water, wherein the mass ratio of the polyvinyl alcohol to the deionized water is 1:4, preparing slurry, pouring the slurry into an alloy mold, wherein the mold can rotate along the central axis of the mold under a magnetic field, and the magnetic field intensity is 2T; after the slurry reacts for 1 min under the magnetic field, applying pressure to form the slurry; finally removing the magnetic field, demoulding, calcining at 1200 ℃ for 10 h in a box-type furnace, cooling to room temperature to obtain Ba0.52Sr2.48Co2Fe24O41A material.
Example 4
Uniformly mixing 0.00078 mol of barium carbonate, 0.00372 mol of strontium carbonate, 0.001 mol of cobaltosic oxide and 0.018 mol of ferric oxide, grinding, tabletting, and calcining at 1200 ℃ in a high-temperature box type furnace for 16 ℃ treatmenth; then placing the sintered sample in a tubular furnace, and carrying out annealing treatment at 950 ℃ for 24 hours in a flowing oxygen atmosphere; grinding the annealed block into powder, taking 3g of the powder, dispersing the powder into a premixed solution of polyvinyl alcohol and deionized water, wherein the mass ratio of the polyvinyl alcohol to the deionized water is 1:10, preparing slurry, pouring the slurry into an alloy mold, wherein the mold can rotate along the central axis of the mold under a magnetic field, and the magnetic field intensity is 2T; after the slurry reacts for 5 min under the magnetic field, applying pressure to form the slurry; finally removing the magnetic field, demoulding, calcining at 1100 ℃ for 24h in a box-type furnace, cooling to room temperature to obtain Ba0.52Sr2.48Co2Fe24O41A material.
Example 5
Uniformly mixing 0.00078 mol of barium carbonate, 0.00372 mol of strontium carbonate, 0.001 mol of cobaltosic oxide and 0.018 mol of ferric oxide, grinding, tabletting, and calcining at 1000 ℃ in a high-temperature box furnace for 20 hours; then placing the sintered sample in a tubular furnace, and carrying out annealing treatment at 950 ℃ for 72 h in a flowing oxygen atmosphere; grinding the annealed block into powder, taking 3g of the powder, dispersing the powder into a premixed solution of polyvinyl alcohol and deionized water, wherein the mass ratio of the polyvinyl alcohol to the deionized water is 1:3, preparing slurry, pouring the slurry into an alloy mold, wherein the mold can rotate along the central axis of the mold under a magnetic field, and the magnetic field intensity is 2T; after the slurry reacts for 15 min under the magnetic field, applying pressure to form the slurry; finally removing the magnetic field, demoulding, calcining at 1150 ℃ for 16 h in a box-type furnace, cooling to room temperature to obtain Ba0.52Sr2.48Co2Fe24O41A material.
Example 6
Uniformly mixing 0.00078 mol of barium carbonate, 0.00372 mol of strontium carbonate, 0.001 mol of cobaltosic oxide and 0.018 mol of ferric oxide, grinding, tabletting, and calcining at 1200 ℃ in a high-temperature box type furnace for 20 hours; then placing the sintered sample in a tubular furnace, and carrying out annealing treatment at 900 ℃ for 24 hours in a flowing oxygen atmosphere; then grinding the annealed block into powder, taking 3g of the powder to disperse in the premix of polyvinyl alcohol and deionized waterIn the liquid, wherein the mass ratio of polyvinyl alcohol to deionized water is 1:1, preparing slurry, pouring the slurry into an alloy mold, fixing the mold in a magnetic field environment, and controlling the magnetic field intensity to be 0.5T; after the slurry reacts for 15 min under the magnetic field, applying pressure to form the slurry; finally removing the magnetic field, demoulding, calcining at 1000 ℃ for 16 h in a box-type furnace, cooling to room temperature to obtain Ba0.52Sr2.48Co2Fe24O41A material.
Example 7
Uniformly mixing 0.00078 mol of barium carbonate, 0.00372 mol of strontium carbonate, 0.001 mol of cobaltosic oxide and 0.018 mol of ferric oxide, grinding, tabletting, and calcining at 1300 ℃ in a high-temperature box furnace for 16 h; then placing the sintered sample in a tubular furnace, and carrying out annealing treatment at 950 ℃ for 48 h in a flowing oxygen atmosphere; grinding the annealed block into powder, taking 3g of the powder, dispersing the powder in a premixed solution of polyvinyl alcohol and deionized water, wherein the mass ratio of the polyvinyl alcohol to the deionized water is 1:5, preparing slurry, pouring the slurry into an alloy mold, fixing the mold in a magnetic field environment, and keeping the magnetic field intensity at 1T; after the slurry reacts for 10 min under the magnetic field, applying pressure to form the slurry; finally removing the magnetic field, demoulding, calcining at 1150 ℃ for 24h in a box-type furnace, cooling to room temperature to obtain Ba0.52Sr2.48Co2Fe24O41A material.
Example 8
Uniformly mixing 0.00078 mol of barium carbonate, 0.00372 mol of strontium carbonate, 0.001 mol of cobaltosic oxide and 0.018 mol of ferric oxide, grinding, tabletting, and calcining at 1100 ℃ in a high-temperature box furnace for 20 hours; then placing the sintered sample in a tubular furnace, and carrying out annealing treatment at 800 ℃ for 72 h in a flowing oxygen atmosphere; grinding the annealed block into powder, taking 3g of the powder, dispersing the powder in a premixed solution of polyvinyl alcohol and deionized water, wherein the mass ratio of the polyvinyl alcohol to the deionized water is 1:8, preparing slurry, pouring the slurry into an alloy mold, fixing the mold in a magnetic field environment, and keeping the magnetic field intensity at 2T; after the slurry reacts for 1 min under the magnetic field, pressure is applied to form the slurry(ii) a Finally removing the magnetic field, demoulding, calcining at 1200 ℃ for 10 h in a box-type furnace, cooling to room temperature to obtain Ba0.52Sr2.48Co2Fe24O41A material.
It can be seen from the above examples that the textured Ba is prepared by using magnetic field biscuit molding and controlling the calcination temperature and time, the mass ratio of the polyvinyl alcohol and the deionized water in the premixed solution, the rotation degree of the mold in the magnetic field, the magnetic field strength and the processing time0.52Sr2.48Co2Fe24O41A material; when the textured material is used for a single-phase multiferroic material, the textured material has the remarkable advantages of high magnetoelectric coupling temperature and high coupling strength; has more prominent preferred orientation and higher crystal orientation factor, and the multiferroic performance of the material is comparable to that of a single crystal material. Therefore, when the textured material is used for room-temperature multiferroic materials, the textured material has the advantages of easiness in synthesis, low cost, high magnetoelectric coupling strength and high coupling temperature.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (8)
1. Textured Z-shaped Ba0.52Sr2.48Co2Fe24O41The preparation method of the hexagonal ferrite is characterized by comprising the following steps:
step one, uniformly mixing, grinding and tabletting raw materials of barium carbonate, strontium carbonate, cobalt oxide and iron oxide in a certain stoichiometric ratio, and then placing the mixture in a box-type furnace for high-temperature calcination to obtain a composite phase A;
step two, placing the phase A in a tube furnace, and annealing in a flowing oxygen atmosphere to obtain a sample B;
grinding the sample B into powder, dispersing a certain amount of powder in a premixed solution of polyvinyl alcohol and deionized water to prepare slurry, transferring the slurry into an alloy die, and after the slurry is treated for a period of time under the condition of a magnetic field, applying pressure to mold the slurry to obtain a biscuit sample C;
step four, removing the magnetic field, taking out the sample C, and placing the sample C in a box furnace for high-temperature sintering treatment to obtain textured Ba0.52Sr2.48Co2Fe24O41A material.
2. The textured Z-type Ba of claim 10.52Sr2.48Co2Fe24O41The preparation method of the hexagonal ferrite is characterized by comprising the following steps: in the first step, the calcination temperature after tabletting is 1000-1300 ℃, and the calcination time is 16-20 h.
3. The textured Z-type Ba of claim 10.52Sr2.48Co2Fe24O41The preparation method of the hexagonal ferrite is characterized by comprising the following steps: in the second step, the annealing temperature is 800-950 ℃ in an oxygen atmosphere, and the annealing time is 24-72 h.
4. The textured Z-type Ba of claim 10.52Sr2.48Co2Fe24O41The preparation method of the hexagonal ferrite is characterized by comprising the following steps: in the third step, the mass ratio of the polyvinyl alcohol to the deionized water in the premixed liquid is 1:1 to 10.
5. The textured Z-type Ba of claim 10.52Sr2.48Co2Fe24O41The preparation method of the hexagonal ferrite is characterized by comprising the following steps: in the third step, the alloy mold can rotate along the central axis of the alloy mold under a magnetic field, the direction of an external magnetic field is kept to be always vertical to the central axis of the alloy mold, the intensity of the magnetic field is 0.5-2T, and the reaction time of slurry under the magnetic field is 1-15 min.
6. The textured Z-type Ba of claim 10.52Sr2.48Co2Fe24O41The preparation method of the hexagonal ferrite is characterized by comprising the following steps: in the third step, the alloy mold is fixed in a magnetic field environment, the direction of an external magnetic field is always kept perpendicular to the central axis of the mold, the magnetic field intensity is 0.5-2T, and the reaction time of slurry under the magnetic field is 1-15 min.
7. The textured Z-type Ba of claim 10.52Sr2.48Co2Fe24O41The preparation method of the hexagonal ferrite is characterized by comprising the following steps: in the fourth step, the sintering temperature of the biscuit is 1000-1200 ℃, and the calcination time is 10-24 h.
8. The textured Z-type Ba of claim 10.52Sr2.48Co2Fe24O41The preparation method of the hexagonal ferrite is characterized by comprising the following steps: in the first step, barium carbonate: strontium carbonate: cobaltosic oxide: the molar ratio of ferric oxide is 0.078: 0.372: 0.1: 1.8.
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