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Similar linear lead-free relaxor ferroelectric ceramic material and preparation method thereof

A ferroelectric ceramic, linear-like technology, applied in circuits, capacitors, electrical components, etc., can solve the problems of effective energy storage efficiency disclosure, large remanent polarization, and low energy storage density, and achieve easy control of reaction conditions and preparation Simple method and good repeatability

Inactive Publication Date: 2020-02-07
SOUTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ferroelectric ceramics also generally have some shortcomings, such as large coercive field, large remanent polarization, effective energy storage efficiency, and low energy storage density.

Method used

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  • Similar linear lead-free relaxor ferroelectric ceramic material and preparation method thereof
  • Similar linear lead-free relaxor ferroelectric ceramic material and preparation method thereof
  • Similar linear lead-free relaxor ferroelectric ceramic material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0037] The prepared chemical composition is 0.82Na 0.5 Bi 0.5 TiO 3 -0.18CaTiO 3The quasi-linear lead-free relaxor ferroelectric ceramic material, its preparation method is as follows:

[0038] (1) Na with a purity of not less than 99% 2 CO 3 、 Bi 2 o 3 , CaCO 3 and TiO 2 The raw materials are mixed according to the molar ratio of 41:41:18:100 and then put into the ball milling tank. At the same time, absolute ethanol (the volume ratio of absolute ethanol to the raw materials participating in the ball milling is 2:1) and zirconia balls are added to the ball milling tank. (The volume ratio of zirconia balls to the raw materials participating in ball milling is 3:2), carry out ball milling for 24 hours at a speed of 270r / min, and dry the mixture obtained after drying (the temperature during the drying process is 70°C);

[0039] (2) Grinding and briquetting the mixture obtained in step (1), pre-burning at 950°C and keeping it warm for 2 hours, and then ball milling (the ...

Embodiment 2

[0046] The prepared chemical composition is 0.82Na 0.5 Bi 0.5 TiO 3 -0.18CaTiO 3 The quasi-linear lead-free relaxor ferroelectric ceramic material, its preparation method is as follows:

[0047] (1) Na with a purity of not less than 99% 2 CO 3 、 Bi 2 o 3 , CaCO 3 and TiO 2 The raw materials are mixed according to the molar ratio of 41:41:18:100 and then put into the ball milling tank. At the same time, absolute ethanol (the volume ratio of absolute ethanol to the raw materials participating in the ball milling is 2:1) and zirconia balls are added to the ball milling tank. (The volume ratio of zirconia balls to the raw materials participating in the ball milling is 3:2), carry out ball milling at a speed of 330r / min for 24 hours, and dry the mixture obtained after drying (the temperature during the drying process is 70°C);

[0048] (2) Grinding and briquetting the mixture obtained in step (1), pre-burning at 950°C and keeping it warm for 2 hours, and then ball milling ...

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Abstract

The invention relates to a similar linear lead-free relaxor ferroelectric ceramic material and a preparation method thereof, and belongs to the field of dielectric capacitor material preparation. Thesimilar linear lead-free relaxor ferroelectric ceramic material has a chemical composition being 0.82Na0.5Bi0.5TiO3-0.18CaTiO3; when the electric field intensity of the material is 180kV / cm at the room temperature, the effective energy storage density is 2.34J / cm<3>, the total energy storage density is 2.87J / cm<3>, and the energy storage efficiency is larger than 80 percent; in addition, when a temperature stability test is conducted at 30 to 150 DEG C, the energy storage efficiency is maintained to be above 80 percent and is relatively stable, so that the similar linear lead-free relaxor ferroelectric ceramic material becomes an ideal material applied to high energy storage density; and meanwhile, the material is prepared and synthesized by adopting a traditional solid-phase reaction method, the preparation method is simple, the requirement on equipment is low, the sintering temperature is relatively lower (below 1180 DEG C), the reaction conditions are easily controlled, and the repeatability is good.

Description

technical field [0001] The invention belongs to the field of preparation of dielectric capacitor materials, and in particular relates to a linear lead-free relaxation ferroelectric ceramic material and a preparation method thereof. Background technique [0002] Compared with other energy storage devices, dielectric capacitors have become the core components of many pulse power supply systems due to their high power density, fast charge and discharge rates, and their miniaturization and integration. However, the low energy storage density is characterized by the fact that dielectric capacitors cannot meet the needs of modern industrialization, thus limiting the further application of dielectric capacitors, so the energy storage density of capacitors needs to be significantly improved. [0003] Dielectric materials should have the characteristics of high dielectric constant, low dielectric loss and temperature stability, among which sodium bismuth titanate (Na 0.5 Bi 0.5 TiO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622C04B41/88H01G4/12
CPCC04B35/475C04B35/622C04B41/5116C04B41/88C04B2235/3201C04B2235/3208C04B2235/3236C04B2235/656H01G4/1209C04B41/4539C04B41/0072
Inventor 刘岗董佳严岩李洋
Owner SOUTHWEST UNIV
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