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A kind of tungsten bronze pure phase room temperature multiferroic ceramics and its preparation method

A technology of room temperature multiferroic and multiferroic ceramics, applied in the field of tungsten bronze pure-phase room temperature multiferroic ceramics and its preparation, can solve the problems of poor ferromagnetism, difficulty in obtaining pure phase, and unfavorable improvement of ferromagnetism , to achieve the effect of short sintering time, low cost, uniform and fine grain

Active Publication Date: 2021-03-30
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved in the present invention is, for current Ba 4 SM 2 Fe 2 Nb 8 o 30 (BSFN) ceramic preparation is difficult to obtain pure phase, poor ferromagnetism, etc.; and the microstructure of BSFN ceramics obtained by the current sintering method is mostly columnar grains, which is not conducive to improving ferromagnetism.

Method used

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  • A kind of tungsten bronze pure phase room temperature multiferroic ceramics and its preparation method
  • A kind of tungsten bronze pure phase room temperature multiferroic ceramics and its preparation method
  • A kind of tungsten bronze pure phase room temperature multiferroic ceramics and its preparation method

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Effect test

Embodiment 1

[0022] Chemical composition expression Ba 4 SM 2 Fe 2 Nb 8 o 30 (BSFN). with BaCO 3 、Sm 2 o 3 , Nb 2 o 5 , Fe 2 o 3 Electronic-grade powder is the raw material for preparing ceramics. The ingredients are weighed according to the molecular formula, and they are milled with high-energy balls in deionized water for 4 hours. After drying, they are heated at 1150 o C for 4 hours to synthesize tungsten bronze single-phase BSFN powder; the BSFN powder was again high-energy ball milled in deionized water for 2 hours, after drying, 1wt% polyvinyl alcohol binder was added for granulation, and the granulated powder The body was pressed into a BSFN green body under 100MPa. After debinding the BSFN body, at 1250 o C microwave sintering method (2.45GHz) heat preservation for 30 minutes, then cool to room temperature with the furnace.

[0023] The obtained BSFN multiferroic single-phase ceramics has a tungsten bronze crystal structure and a microstructure composed of equiaxed g...

Embodiment 2

[0025] Chemical composition expression Ba 4 SM 2 Fe 2 Nb 8 o 30 (BSFN). with BaCO 3 、Sm 2 o 3 , Nb 2 o 5 , Fe 2 o 3 Electronic-grade powder is the raw material for preparing ceramics. The ingredients are weighed according to the molecular formula, and they are high-energy ball milled in alcohol for 6 hours. After drying, they are heated at 1150 o C for 2 hours to synthesize tungsten bronze single-phase BSFN powder; the BSFN powder was again high-energy ball milled in alcohol for 2 hours, after drying, 1wt% polyvinyl alcohol binder was added for granulation, and the granulated powder was Pressed into BSFN body under 150MPa. After debinding the BSFN body, at 1250 o C microwave sintering method (2.45GHz) heat preservation for 30 minutes, then cool to room temperature with the furnace.

[0026] The obtained BSFN multiferroic single-phase ceramics has a tungsten bronze crystal structure and a microstructure composed of equiaxed grains with a size not exceeding 2 micro...

Embodiment 3

[0028] Chemical composition expression Ba 4 SM 2 Fe 2 Nb 8 o 30 (BSFN). with BaCO 3 、Sm 2 o 3 , Nb 2 o 5 , Fe 2 o 3 The electronic grade powder is the raw material for preparing ceramics. The ingredients are weighed according to the molecular formula, and the high-energy ball milling in deionized water is carried out for 16 hours. o C for 4 hours to synthesize tungsten bronze single-phase BSFN powder; the BSFN powder was again high-energy ball milled in deionized water for 4 hours, after drying, 1wt% polyvinyl alcohol binder was added for granulation, and the granulated powder The body was pressed into a BSFN green body under 100MPa. After debinding the BSFN body, at 1250 o C Microwave sintering method (2.45GHz) heat preservation for 15 minutes, and cool to room temperature with the furnace. The obtained BSFN multiferroic single-phase ceramics has a tungsten bronze crystal structure and a microstructure composed of equiaxed grains with a size not exceeding 2 micr...

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Abstract

The invention discloses a tungsten bronze pure-phase room-temperature multiferroic ceramic and a preparation method thereof. The tungsten bronze pure-phase room-temperature multiferroic ceramic is quickly prepared by microwave sintering, and has the advantages that the ferroelectric property and ferromagnetic property are excellent, and the magnetoelectric coupling effect is strong; the sources ofraw materials are wide, the price is low, and the environment-friendly effect is realized; the preparation technology is simple, the property is excellent, and the larger industrialized application value is realized.

Description

technical field [0001] The invention relates to a tungsten bronze pure-phase room temperature multiferroic ceramic and a preparation method thereof. Background technique [0002] Multiferroic materials refer to a class of important functional materials that have two or more of the three properties of ferroelectricity, ferromagnetism and ferroelasticity at the same time, and there is mutual coupling between the basic ferroic properties to produce new effects. Its basic characteristics are ferroelectricity and ferromagnetism, and it has various physical effects such as piezoelectric effect, ferroelectric effect, pyroelectric effect, nonlinear optical effect, and magnetoelectric coupling effect under the condition of an external electric field. These specific properties make multiferroic materials widely used in piezoelectric sonar, ferroelectric thin film memory, sensors, electro-optic light valves and other important materials. [0003] At present, multiferroic materials mai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/634C04B35/638
CPCC04B35/495C04B35/622C04B35/63416C04B35/638C04B2235/3215C04B2235/3224C04B2235/3272C04B2235/786C04B2235/96
Inventor 郑兴华罗国仕
Owner FUZHOU UNIV
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