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Tungsten bronze monophase multiferroic ceramic material and preparation method thereof

A technology of multiferroic ceramics and tungsten bronze, applied in the field of functional ceramic materials, can solve the problems of harsh reaction conditions, complex product phase, long reaction cycle, etc., and achieves improved application value, simple preparation process, multiferroic performance. improved effect

Active Publication Date: 2018-06-12
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, multiferroic materials are mainly concentrated on multi-phase composite materials and layered materials, but these processes often have complex formulas, complex processes, long reaction cycles, harsh reaction conditions, and complex phases of products.

Method used

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  • Tungsten bronze monophase multiferroic ceramic material and preparation method thereof
  • Tungsten bronze monophase multiferroic ceramic material and preparation method thereof
  • Tungsten bronze monophase multiferroic ceramic material and preparation method thereof

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preparation example Construction

[0030] A kind of preparation method of tungsten bronze type single-phase multiferroic ceramic material, the chemical formula of this material is Ba 4 - 2x Ca 2x SM 2 Fe 2 Nb 8 o 30 , x=0.2, 0.4, 0.6 or 0.8, which includes the following steps:

[0031] (1) Weigh the corresponding mass of BaCO according to the molar ratio 3 , CaCO 3 、Sm 2 o 3 , Fe 2 o 3 and Nb 2 o 5 , to synthesize Ba 4- 2x Ca 2x SM 2 Fe 2 Nb 8 o 30 (x=0.2, 0.4, 0.6, 0.8), mix all weighed powders evenly to form a full batch;

[0032]Mix all the ingredients with zirconia balls and deionized water, then perform ball milling, drying and sieving in sequence to form a pure-phase ceramic powder after sieving;

[0033] (2) The pure-phase ceramic powder is made into a sample by cold isostatic pressing, and the prepared sample is sintered at high temperature to obtain a sintered sample;

[0034] (3) Grinding and cleaning the sintered sample obtained in step (2), uniformly coat the silver electrode s...

example 1

[0041] (1) First mix raw materials according to molar ratio to form mixture A, wherein BaCO 3 and CaCO 3 The stoichiometric ratio is 9:1, respectively, Sm 2 o 3 , Fe 2 o 3 , Nb 2 o 5 The stoichiometric ratio is 1:1:4. Take the mixture A, zirconia balls and deionized water, mix them according to the mass ratio of 1:4:0.8, use a planetary ball mill for 20 hours, then dry them at 80°C for 14 hours, briquette them, and place them in a box furnace Incubate at 1200°C for 2 hours respectively, and set aside;

[0042] Grind the dried briquette through a 120 mesh sieve to form a sieve to obtain a pure phase of Ba 9 CaS 2 Fe 2 Nb 8 o 30 Ceramic powder, the scanning electron microscope image of which is shown in figure 2 As shown in (a), short rod-shaped tungsten bronze grains can be obtained, and the compactness is good, so that the multiferroic properties of ceramics are greatly improved;

[0043] (2) The sieved material obtained in step (3) is pressed into a sample by c...

example 2

[0046] (1) First mix raw materials according to molar ratio to form mixture A, wherein BaCO 3 and CaCO 3 The stoichiometric ratio is 4:1, respectively, Sm 2 o 3 , Fe 2 o 3 , Nb 2 o 5 The stoichiometric ratio is 1:1:4. Take the mixture A, zirconia ball stone and deionized water, mix according to the mass ratio of 1:4:0.9, use planetary ball mill for 21h, then dry at 70°C for 15h, briquette, and place in a box furnace Incubate at 1200°C for 2 hours respectively, and set aside;

[0047] Grind the dried briquette through a 200-mesh sieve to form a sieve to obtain a pure phase of Ba 4 CaS 2 Fe 2 Nb 8 o 30 Ceramic powder, the scanning electron microscope image of which is shown in figure 2 Shown in (b) among, can obtain the crystal grain of short rod shape tungsten bronze type with the step of example, make the multiferroic performance of ceramics be greatly improved;

[0048] (2) Press the sieved material obtained in step (1) into a sample by cold isostatic pressing ...

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Abstract

The invention provides a tungsten bronze monophase multiferroic ceramic material and a preparation method thereof. The preparation method includes following steps: 1, preparing pure-phase ceramic powder: well mixing all weighed powder to form ingredients, subjecting the ingredients to ball milling, drying and sieving sequentially to obtain a discharged material which is the pure-phase ceramic powder; 2, subjecting the pure-phase ceramic powder to isostatic cool pressing to obtain a sample, and sintering the sample to obtain a sintered sample; 3, sequentially polishing and cleaning the sinteredsample, uniformly coating the front and the back of the sintered sample with electrode slurry, and sintering the sample coated with the electrode slurry to obtain the tungsten bronze monophase multiferroic ceramic material corresponding to the pure-phase ceramic powder. Ferroelectricity and ferromagnetism of tungsten bronze monophase ceramic can be enhanced. The tungsten bronze ceramic material prepared by the method can improve purity and grain morphology of ceramic, and multiferroic performance of the ceramic is improved greatly.

Description

technical field [0001] The invention relates to a functional ceramic material, in particular to a tungsten bronze type single-phase multiferroic ceramic material and a preparation method thereof. Background technique [0002] Multiferroic materials refer to the basic properties of two or more ferroic materials in the material. These basic properties of ferroelectricity include ferroelectricity (antiferroelectricity), ferromagnetism (antiferromagnetism, ferrimagnetism) and iron elasticity. Multiferroics are multifunctional materials that combine electrical and magnetic properties. Multiferroic materials not only have various single ferrotypes (such as ferroelectricity and ferromagnetism), but also can control electric polarization by magnetic field or magnetic polarization by electric field through the coupling and recombination of ferroicity. It also has some new effects, which greatly broaden the application range of ferrous materials. Because the tungsten bronze structu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/50C04B41/88
CPCC04B35/495C04B35/50C04B41/009C04B41/5116C04B41/88C04B2235/3272C04B2235/442C04B2235/6562C04B2235/6565C04B41/4539
Inventor 王卓肖雨佳王添念雯雯陈浩楠
Owner SHAANXI UNIV OF SCI & TECH
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