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High-electric-field-resistant high-energy-density barium titanate-based relaxor ferroelectric ceramic material and preparation method thereof

A high energy storage density, ferroelectric ceramic technology, applied in the field of capacitor material preparation, can solve the problems of remanent polarization, large coercive field, low effective energy storage density and energy storage efficiency, limitations, etc., and achieve high dielectric constant. , The effect of low equipment requirements and simple operation

Active Publication Date: 2020-01-03
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Capacitors are widely used in pulse fields such as communication equipment, industrial instrument power supplies, and weapons because of their high power density. Among them, inorganic dielectric capacitors represented by ceramic dielectrics are simple in structure, high temperature resistance, corrosion resistance, low price and The preparation process is simple and has attracted much attention; and the ferroelectric ceramics typically represented by barium titanate, because of the high saturation polarization value and relative permittivity, make it a very potential matrix ceramic, but due to the ferroelectric Ceramics are generally limited by the shortcomings of remanent polarization, large coercive field, and low effective energy storage density and energy storage efficiency.

Method used

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  • High-electric-field-resistant high-energy-density barium titanate-based relaxor ferroelectric ceramic material and preparation method thereof
  • High-electric-field-resistant high-energy-density barium titanate-based relaxor ferroelectric ceramic material and preparation method thereof
  • High-electric-field-resistant high-energy-density barium titanate-based relaxor ferroelectric ceramic material and preparation method thereof

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Embodiment 1

[0037] Preparation of a Barium Titanate-based Relaxor Ferroelectric Ceramic Material with High Electric Field Resistance and High Energy Storage Density

[0038] (0.65(Ba 0.98 Li 0.04 ) Ti 0.98 o 3 -0.35 (Sr 0.7 Bi 0.2 )TiO 3 ), the specific method is as follows:

[0039] (1) Weigh the raw material SrCO with a purity of more than 99% according to the molar ratio of 7:2:10 3 、 Bi 2 o 3 and TiO 2 , put into the ball mill tank after mixing the raw materials weighed, and add the ball milling solvent absolute ethanol (dehydrated alcohol and the above-mentioned added SrCO 3 、 Bi 2 o 3 and TiO 2 The volume ratio of the total volume is 2:1) and zirconia balls (zirconia balls and the above added SrCO 3 、 Bi 2 o 3 and TiO 2 The volume ratio of the total volume is 3:2, wherein the zirconia balls are composed of zirconia balls with a diameter of 10mm and a diameter of 5mm according to the number ratio of 1:2), after ball milling at a ball milling speed of 270r / min for 24 ...

Embodiment 2

[0052] Preparation of a Barium Titanate-based Relaxor Ferroelectric Ceramic Material with High Electric Field Resistance and High Energy Storage Density

[0053] (0.65(Ba 0.98 Li 0.04 ) Ti 0.98 o 3 -0.35 (Sr 0.7 Bi 0.2 )TiO 3 ), the specific method is as follows:

[0054] (1) Weigh the raw material SrCO with a purity of more than 99% according to the molar ratio of 7:2:10 3 、 Bi 2 o 3 and TiO 2 , put into the ball mill tank after mixing the raw materials weighed, and add the ball milling solvent absolute ethanol (dehydrated alcohol and the above-mentioned added SrCO 3 、 Bi 2 o 3 and TiO 2 The volume ratio of the total volume is 2:1) and zirconia balls (zirconia balls and the above added SrCO 3 、 Bi 2 o 3 and TiO 2 The volume ratio of the total volume is 3:2, wherein the zirconia balls are composed of zirconia balls with a diameter of 10mm and a diameter of 5mm according to the number ratio of 1:2), and ball milled at a ball milling speed of 330r / min for more t...

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Abstract

The invention relates to a high-electric-field-resistant high-energy-density barium titanate-based relaxor ferroelectric ceramic material and a preparation method thereof, belonging to the technical field of capacitor material preparation. The chemical composition of the barium titanate-based relaxor ferroelectric ceramic material with high electric field resistance and high energy storage densityis 0.65 (Ba<0.98>Li<0.04>) Ti<0.98>O<3>-0.35 (Sr<0.7>Bi<0.2>)TiO<3>, and the barium titanate-based relaxor ferroelectric ceramic material with high electric field resistance and high energy storage density can resist a high electric field at room temperature and has a total energy storage density of 3.43 J / cm<3> and an effective energy storage density of 2.43 J / cm<3> at room temperature in an electric field with a density of 340 kV / cm; the energy storage efficiency of the material between 10 kV / cm and 340 kV / cm is larger than 70%; and the materials is prepared through solid-phase synthesis ata low temperature and has a high dielectric constant and a low sintering temperature, and the preparation method is easy to operate, low in equipment requirement, easily controllable in reaction conditions and good in repeatability.

Description

technical field [0001] The invention belongs to the technical field of capacitor material preparation, and in particular relates to a barium titanate-based relaxation ferroelectric ceramic material with high electric field resistance and high energy storage density and a preparation method thereof. Background technique [0002] Capacitors are widely used in pulse fields such as communication equipment, industrial instrument power supplies, and weapons because of their high power density. Among them, inorganic dielectric capacitors represented by ceramic dielectrics are simple in structure, high temperature resistance, corrosion resistance, low price and The preparation process is simple and has attracted much attention; and the ferroelectric ceramics typically represented by barium titanate, because of the high saturation polarization value and relative permittivity, make it a very potential matrix ceramic, but due to the ferroelectric Ceramics are generally limited by the s...

Claims

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Application Information

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IPC IPC(8): C04B35/468
CPCC04B35/468C04B2235/77C04B2235/96C04B2235/442C04B2235/3298
Inventor 刘岗李洋严岩
Owner SOUTHWEST UNIVERSITY