Sodium bismuth titanate-based ferroelectric ceramic as well as preparation method and application thereof

A bismuth sodium titanate-based, ferroelectric ceramic technology, applied in ceramic molding machines, manufacturing tools, fixed capacitor dielectrics, etc. Low polarization value, low energy storage density and energy storage efficiency, etc., to achieve the effect of facilitating development and application, increasing saturation polarization value, and increasing energy storage density

Inactive Publication Date: 2017-09-08
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the breakdown field strength and saturation polarization value of ferroelectric ceramics currently produced are low, resulting in low energy storage density and energy storage efficiency, and their ferroelectric properties are easily affected by the ground interface, surface, etc., and the driving force is relatively low. Small, with low sensitivity and narrow operating frequency

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  • Sodium bismuth titanate-based ferroelectric ceramic as well as preparation method and application thereof
  • Sodium bismuth titanate-based ferroelectric ceramic as well as preparation method and application thereof

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preparation example Construction

[0025] The present invention also provides a preparation method of the above bismuth sodium titanate-based ferroelectric ceramics, comprising the following steps:

[0026] S1: prepare each raw material component according to the stoichiometric ratio in the general chemical formula of bismuth sodium titanate-based ferroelectric ceramics, and then mix them uniformly to obtain a mixed powder;

[0027] Preferably, the uniform mixing specifically includes the following steps: S101: Put all raw material components and alcohol in a ball mill containing zirconium balls for ball milling to obtain a powder alcohol suspension; wherein, the total mass of all raw material components, zirconium The ratio of ball mass to alcohol mass is 1:(1~3):(0.5~1.5), the rotating speed of ball milling is 400~600r / min, and the time of ball milling is 20~28h; S102: Put the powder alcohol suspension in Dry at 90-110°C for 3-5 hours to obtain a mixed powder.

[0028] S2: Grinding the mixed powder in advanc...

Embodiment 1

[0041] This embodiment provides a bismuth sodium titanate-based ferroelectric ceramic, the chemical general formula of bismuth sodium titanate-based ferroelectric ceramic is: 0.9(0.94Na 0.5 Bi 0.5 TiO 3 -0.06BaTiO 3 )-0.1NaNbO 3 , The structure of bismuth sodium titanate-based ferroelectric ceramics is a single perovskite structure.

[0042] Adopt the preparation method of bismuth sodium titanate-based ferroelectric ceramics provided by the present invention to prepare bismuth sodium titanate-based ferroelectric ceramics:

[0043] S1: prepare each raw material component according to the stoichiometric ratio in the general chemical formula of bismuth sodium titanate-based ferroelectric ceramics, and then mix them uniformly to obtain a mixed powder;

[0044] The uniform mixing specifically includes the following steps: S101: Put all raw material components and alcohol in a planetary ball mill containing zirconium balls for ball milling to obtain a powder alcohol suspension; ...

Embodiment 2

[0057] This embodiment provides a bismuth sodium titanate-based ferroelectric ceramic. The general chemical formula of the bismuth sodium titanate-based ferroelectric ceramic is: 0.995[0.9(0.94Na 0.5 Bi 0.5 TiO 3 -0.06BaTiO 3 )-0.1NaNbO 3 ]-0.005Zn, the structure of bismuth sodium titanate-based ferroelectric ceramics is a single perovskite structure.

[0058] Adopt the preparation method of bismuth sodium titanate-based ferroelectric ceramics provided by the present invention to prepare bismuth sodium titanate-based ferroelectric ceramics:

[0059] S1: prepare each raw material component according to the stoichiometric ratio in the general chemical formula of bismuth sodium titanate-based ferroelectric ceramics, and then mix them uniformly to obtain a mixed powder;

[0060] The uniform mixing specifically includes the following steps: S101: Put all raw material components and alcohol in a planetary ball mill containing zirconium balls for ball milling to obtain a powder a...

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Abstract

The invention relates to a sodium bismuth titanate-based ferroelectric ceramic as well as a preparation method and the application thereof. A general chemical formula of the sodium bismuth titanate-based ferroelectric ceramic is (1-x)[0.9(0.94Na0.5Bi0.5TiO3-0.06BaTiO3)-0.1NaNbO3]-xZn, wherein x in the formula is greater than or equal to 0 and less than or equal to 0.01. The preparation method comprises the following steps: firstly, preparing all raw material components according to the stoichiometric ratio, then uniformly mixing all the raw material components and carrying out pre-sintering and grinding in sequence to obtain a ground powder body; secondly, carrying out granulating to obtain a granulated powder body; thirdly, carrying out dry pressing and cold isostatic pressing to obtain a densified ceramic green body, carrying out adhesive removal on the densified ceramic green body, and then sintering to obtain the sodium bismuth titanate-based ferroelectric ceramic. According to the preparation method disclosed by the invention, by doping zinc in the sodium bismuth titanate-based ferroelectric ceramic, the breakdown strength and a saturation polarization value of the sodium bismuth titanate-based ferroelectric ceramic are improved, the energy storage density and the stability are improved, leakage current is reduced, growth orientation of crystals is benefited as well as development and application of high-power and high-capacity storage capacitors are facilitated.

Description

technical field [0001] The invention relates to the technical field of electronic functional materials and devices, in particular to a bismuth sodium titanate-based ferroelectric ceramic and its preparation method and application. Background technique [0002] Ferroelectric material is a kind of energy storage material with excellent dielectric properties. It has been widely studied by researchers from various countries and its application has been realized. However, in the process of preparation or application of ferroelectric materials, lead-based materials are usually required, and lead-based materials cause serious harm to the ecological environment and human health in the process of preparation, use and disposal. Therefore, the development of lead-free ferroelectric materials, It is one of the urgent tasks related to the sustainable development of electronic technology in our country. Sodium bismuth titanate Na 0.5 Bi 0.5 TiO 3 (abbreviated as NBT) is a type of pero...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622C04B35/626H01G4/12B28B3/00
CPCC04B35/475B28B3/003C04B35/622C04B35/6261C04B2235/3201C04B2235/3215C04B2235/3232C04B2235/3236C04B2235/3255C04B2235/40C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/768H01G4/1227
Inventor 郝喜红姚远孙宁宁李雍张奇伟
Owner INNER MONGOLIA UNIV OF SCI & TECH
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