A kind of tungsten bronze type single-phase multiferroic ceramic material and preparation method thereof

A technology of multiferroic ceramics and tungsten bronze, which is applied in the field of functional ceramic materials, can solve the problems of harsh reaction conditions, complex product phases, long reaction cycles, etc., and achieve improved application value, simple preparation process, and multiferroic properties. Improved effect

Active Publication Date: 2021-04-06
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of tungsten bronze type single-phase multiferroic ceramic material and preparation method thereof
  • A kind of tungsten bronze type single-phase multiferroic ceramic material and preparation method thereof
  • A kind of tungsten bronze type single-phase multiferroic ceramic material and preparation method thereof

Examples

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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 sl...

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 3.6 Ca 0.4 SM 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 sa...

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 briquettes through a 200-mesh sieve to form a sieve to obtain a pure phase of Ba 3.2 Ca 0.8 SM 2 Fe 2 Nb 8 o 30 Ceramic powder, the scanning electron microscope image of which is shown in figure 2 As shown in (b), the steps of examples can be used to obtain short rod-shaped tungsten bronze grains, which greatly improves the multiferroic properties of ceramics;

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

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Abstract

The invention provides a tungsten bronze type single-phase multiferroic ceramic material and a preparation method thereof, comprising the following steps: 1. Preparation of a pure-phase ceramic powder, mixing all weighed powders uniformly to form a full batch; mixing the full batch Carry out ball milling, drying and sieving in sequence to form a pure-phase ceramic powder after sieving; 2. Make a sample of the pure-phase ceramic powder by cold isostatic pressing, and prepare 3. Grinding and cleaning the sintered samples in sequence, coating the electrode slurry evenly on both sides of the sintered sample after grinding and cleaning, and sintering the sample coated with the electrode to obtain the The pure-phase ceramic powder corresponds to the tungsten bronze type single-phase multiferroic ceramic material. The invention can enhance the ferroelectricity and ferromagnetism of tungsten bronze single-phase ceramics. The tungsten bronze type ceramic material prepared by the invention can improve the purity of the ceramic, improve the grain shape of the ceramic, and greatly improve the multiferroic performance of the ceramic.

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 Patents(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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