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A bismuth sodium titanate-based transparent ceramic material and its preparation method and application

A bismuth sodium titanate-based, transparent ceramic technology, applied in the direction of ceramics, inorganic insulators, etc., can solve the problems of difficult to achieve anti-breakdown electric field, limited energy storage density, low anti-breakdown electric field, etc., and achieve excellent cycle stability and density The effect of high and excellent energy storage characteristics

Active Publication Date: 2021-09-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrical conductivity of BNT-based ceramics is often high, resulting in a low breakdown electric field, which severely limits the further improvement of energy storage density.
BNT-based piezoelectric ceramics prepared by conventional solid-state sintering are difficult to achieve a breakthrough in the resistance to breakdown electric field

Method used

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  • A bismuth sodium titanate-based transparent ceramic material and its preparation method and application
  • A bismuth sodium titanate-based transparent ceramic material and its preparation method and application
  • A bismuth sodium titanate-based transparent ceramic material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Preparation of transparent ceramic material BNT-BT-0.125BZN fine crystals

[0048] According to 0.825Bi 0.5 NA 0.5 TIO 3 -0.05BaTiO 3 -0.125Bi (Zn 2 / 3 NB 1 / 3 ) O 3 The molar stoichiometric ratio of Bi weighed raw materials 2 O 3 NA 2 CO 3 , Baco 3 , ZnO, Nb 2 O 5 TiO 2 Mixed, with a good material into a nylon pot in ethanol as a medium, zirconia balls as the ball milling for 8h at a speed of 250r / min is. The milled slurry was then dried at 80 deg.] C. After drying the powder through a 200 mesh screen was placed in an alumina crucible, calcined at 800 deg.] C 5h, to obtain a calcined powder. Was added 1wt.% Of the calcined powder B of 2 O 3 -Sio 2 Sintering Aid -ZnO glass powder (average particle diameter 0.7 m), and then placed in ethanol as medium zirconia balls as grinding balls in a nylon pot milling for 24h at a speed of 250r / min, and then in drying 80 ℃. After the above powder was sieved, added 1% of the mass fraction of polyvinyl butyral (PVA), sufficiently milled...

Embodiment 2

[0060] Other conditions were the same as in Example 1, only the sintering temperature is 920 ℃. This sintering temperature to obtain a ceramic density was 92%, the porous ceramic, the electric field which puncture 12kV / mm.

Embodiment 3

[0062] Other conditions were the same as in Example 1, only the sintering temperature is 980 ℃. This sintering temperature, the ceramic density was 90%, the porous ceramic, the electric field which puncture 10kV / mm.

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Abstract

The invention discloses a bismuth sodium titanate-based transparent ceramic material and a preparation method thereof, the general chemical formula of which is (0.95-x)Bi 0.5 Na 0.5 TiO 3 ‑0.05 BaTiO 3 ‑xBi(Zn 2 / 3 Nb 1 / 3 )O 3 , x=0.05~0.15 (abbreviated as (0.95-x)BNT-BT-xBZN). The traditional solid-state method is used to pre-fire once and sinter once. By adding sintering aids and adjusting the sintering process, transparent fine-grained ceramics are successfully prepared at a lower sintering temperature, with an average grain size of about 400nm. The ceramic sheet prepared by the invention shows strong dielectric relaxation, slender ferroelectric hysteresis loop and high breakdown resistance electric field, and is an excellent dielectric energy storage ceramic material. The highest discharge energy density of 2.83J / cm was obtained under the applied electric field of 18kV / mm 3 , the energy storage density is 4.23J / cm 3 , the energy storage efficiency is 67%. In addition, the cycle stability of its energy storage performance is also very good, after 10 5 In the second cycle test, the loss of discharge energy density is less than 2%.

Description

Technical field [0001] The present invention relates to a preparation method and application thereof, which is a preparation method and application thereof, which is a preparation method and application thereof. Background technique [0002] Dielectric ceramics have always been an excellent candidate material for preparing pulse power dielectric storage capacitors due to its advantages such as its temperature stability and long cycle life. Ceramic energy storage capacitors can achieve transient large currents, high voltage discharge, is an important electronic component, which has an irreplaceable position in the field of renewable power energy equipment. However, ceramic energy storage capacitors are currently limited by its low storage density, far from meeting people's requirements for energy storage devices, integratedization. In recent years, the research of ceramic energy storage capacitors has been widely concerned. The main direction of operation includes increasing its e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B3/12C04B35/475C04B41/88
Inventor 张斗周学凡祁核罗行
Owner CENT SOUTH UNIV
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