Sodium-bismuth-titanate-based unleaded ceramic with negative electrocaloric effect and preparing method of sodium-bismuth-titanate-based unleaded ceramic

A technology based on lead-free ceramics and sodium bismuth titanate, applied in the field of ceramic materials, can solve the problems of ecological environment and human health hazards, high requirements for the surrounding environment, etc., to improve energy collection, improve solid-state refrigeration efficiency and high Curie temperature. Effect

Inactive Publication Date: 2015-10-21
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on the negative electricity card effect is mainly concentrated on the lead-containing film. However, the lead-based materials cause serious harm to the ecological environment and human health in the process of preparation, use and disposal, and the film-making process has high requirements on the surrounding environment.

Method used

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  • Sodium-bismuth-titanate-based unleaded ceramic with negative electrocaloric effect and preparing method of sodium-bismuth-titanate-based unleaded ceramic
  • Sodium-bismuth-titanate-based unleaded ceramic with negative electrocaloric effect and preparing method of sodium-bismuth-titanate-based unleaded ceramic
  • Sodium-bismuth-titanate-based unleaded ceramic with negative electrocaloric effect and preparing method of sodium-bismuth-titanate-based unleaded ceramic

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preparation example Construction

[0026] The chemical composition of the bismuth sodium titanate base lead-free ceramics of the negative electric card effect of the present invention is: (1-x) (Na 0.5 Bi 0.5 )TiO 3 -xSrTiO 3 , wherein: 0≤x≤0.10, prepared by sol-gel powder microwave sintering method, the preparation method includes the following steps: (1) using sodium acetate, bismuth nitrate, strontium acetate and tetra-n-butyl titanate as raw materials, Ethylene glycol methyl ether or acetic acid is used as a solvent, acetylacetone or formamide is used as a chelating agent, and a precursor solution is prepared. The molar concentration of the precursor solution is controlled at 0.3-0.7mol / L; (2) dehydration to form xerogel: the precursor Put the body solution in an oven, control the temperature at 30-70°C, and dehydrate for 10-24 hours; then put it into a vacuum drying oven, keep the pressure at 60-90kPa and 30-70°C for 10-24 hours, and form a dry Gel; (3) Sintering Grind the dry gel, put it into a crucibl...

Embodiment 1

[0030] Ceramic a, the chemical composition is: (Na 0.5 Bi 0.5 )TiO 3 , ie x=0

[0031] Its preparation method is:

[0032] (1) Configure the precursor solution

[0033] Sodium acetate, bismuth nitrate, strontium acetate and tetra-n-butyl titanate are used as raw materials, ethylene glycol methyl ether is used as a solvent, and acetylacetone is used as a chelating agent. The molar ratio is: sodium acetate: bismuth nitrate: strontium acetate: tetratitanate n-butyl ester 1:1:0:1, ethylene glycol methyl ether: acetylacetone = 9:2, control the excess of sodium acetate and bismuth nitrate by 5% and 2% respectively, and control the molar concentration of the precursor solution at 0.5mol / L ;

[0034] (2) Dehydration to form xerogel

[0035] Place the precursor solution in an oven, control the temperature at 50°C, and dehydrate for 24 hours; then put it into a vacuum drying oven, keep the pressure at 80kPa and 50°C for 24 hours, and form a xerogel;

[0036] (3) Sintering conditi...

Embodiment 2

[0041] Ceramic b: 0.98 (Na 0.5 Bi 0.5 )TiO 3 -0.02SrTiO 3， , ie x=0.02

[0042] Its preparation method is:

[0043] (1) Configure the precursor solution

[0044] Sodium acetate, bismuth nitrate, strontium acetate and tetra-n-butyl titanate are used as raw materials, ethylene glycol methyl ether is used as a solvent, and acetylacetone is used as a chelating agent. The molar ratio is: sodium acetate: bismuth nitrate: strontium acetate: tetratitanate n-butyl ester 0.49:0.49:0.02:1, ethylene glycol methyl ether: acetylacetone = 9:2, control the excess of sodium acetate and bismuth nitrate by 5% and 2% respectively, and control the molar concentration of the precursor solution at 0.5mol / L ;

[0045] (2) Dehydration to form xerogel

[0046] Place the precursor solution in an oven, control the temperature at 50°C, and dehydrate for 24 hours; then put it into a vacuum drying oven, keep the pressure at 80kPa and 50°C for 24 hours, and form a xerogel;

[0047] (3) Sintering cond...

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Abstract

The invention relates to a sodium-bismuth-titanate-based unleaded ceramic with the negative electrocaloric effect and a preparing method of the sodium-bismuth-titanate-based unleaded ceramic. The chemical composition of the ceramic is (1-x)(Na0.5Bi0.5)TiO3-xSrTiO3, wherein x is larger than or equal to 0 but smaller than or equal to 0.10. The ceramic is prepared through combination of a sol-gel method and a microwave sintering method, lead is not contained in the ceramic material, the ceramic has the advantages of being environmentally friendly and nuisanceless, meanwhile, the ceramic material has the high negative refrigerating performance and also has the low dielectric loss energy, the negative electrocaloric effect near the room temperature can reach up to 0-minus 7 DEG C, and the ceramic can be widely applied to development of environment-friendly micro-refrigerators high in refrigerating efficiency and energy conversion efficiency.

Description

technical field [0001] The invention relates to a ceramic material with a negative electric card effect, in particular to a bismuth sodium titanate-based lead-free ceramic with a negative electric card effect, and belongs to the technical field of electronic functional materials and devices. Background technique [0002] In the process of further miniaturization and integration of electronic circuits, the contradiction between the characteristics of small-sized parts and a certain volume heat capacity and the high energy density of the micro-drive power supply has become increasingly prominent, and there is an urgent need for a micro-cooling system to locally cool the device. In the existing refrigeration methods, the electric card effect is more efficient and more environmentally friendly than the traditional refrigeration methods, and its application has been realized. In 2014, T.Correia and Q.Zhang proposed a negative electrocaloric effect and its role in the refrigeratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622
Inventor 郝喜红徐子盛李晓伟张奇伟杨吉春安胜利
Owner INNER MONGOLIA UNIV OF SCI & TECH
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