Thin film material with high electrocaloric effect near room temperature and preparation method thereof

A technology of thin film materials and electric card effect, applied in the direction of machines using electric/magnetic effects, manufacturing/processing of electromagnetic devices, material selection, etc., can solve problems such as hazards and inability to meet the practical application of electric card effect, and achieve a wide range Application prospects, widening the working temperature range, and the effect of high power card temperature change

Active Publication Date: 2021-02-23
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lead-based materials cannot meet the practical application of the electric card effect due to the fact that the Curie temperature is much higher than room temperature and the harm of Pb to the environment.

Method used

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  • Thin film material with high electrocaloric effect near room temperature and preparation method thereof
  • Thin film material with high electrocaloric effect near room temperature and preparation method thereof
  • Thin film material with high electrocaloric effect near room temperature and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～2

[0028] A (1-x)Ba(Ti 0.8 Zr 0.2 )O 3 -x(Ba 0.7 Ca 0.3 )TiO 3 Thin film, x takes the value of 0.32,0.5 respectively, and its preparation method comprises the following steps:

[0029] 1) Using barium acetate, calcium acetate, zirconium n-propoxide, and tetrabutyl titanate as raw materials, according to the x value of 0.32 and 0.5 (1-x)Ba(Ti 0.8 Zr 0.2 )O 3 -x(Ba 0.7 Ca 0.3 )TiO 3 The stoichiometric ratio, calculate and weigh the corresponding raw materials;

[0030]2) Dissolve the weighed barium acetate and calcium acetate in acetic acid, stir at 50-60°C until completely dissolved to obtain solution A, dissolve zirconium n-propoxide in ethylene glycol methyl ether, stir at room temperature until completely dissolved , and then mix the obtained zirconium n-propoxide solution with solution A, stir at 50°C for 1 hour and then cool to room temperature to obtain solution B, add tetrabutyl titanate to solution B and mix well, dilute with ethylene glycol methyl ether to (1-...

Embodiment 3～6

[0042] A 0.68Ba(Ti 0.8 Zr 0.2 )O 3 -0.32 (Ba 0.7 Ca 0.3 )TiO 3 -ySn film, the value of y is respectively 0.01, 0.02, 0.04, 0.06, and its preparation method comprises the following steps:

[0043] 1) Using barium acetate, calcium acetate, zirconium n-propoxide, tin acetate, and tetrabutyl titanate as raw materials, according to y values ​​of 0.01, 0.02, 0.04, and 0.06, 0.68Ba(Ti 0.8 Zr 0.2 )O 3 -0.32 (Ba 0.7 Ca 0.3 )TiO 3 - The stoichiometric ratio of ySn, calculate and weigh the corresponding raw materials;

[0044] 2) Dissolve the weighed tin acetate in acetic acid, stir at 70-80°C for 30-60min, then add barium acetate and calcium acetate and stir at 40-50°C until clear to obtain solution A, add zirconium n-propoxide Dissolve in ethylene glycol methyl ether, stir at room temperature until completely dissolved, then mix the obtained zirconium n-propoxide solution with solution A, stir at 50°C for 1 hour and cool to room temperature to obtain solution B, tetrabutyl t...

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Abstract

The invention relates to a thin film material with a high electrocaloric effect near room temperature and a preparation method thereof, the chemical general formula of the thin film material is (1-x)Ba(Ti0.8Zr0.2)O<3-x>(Ba0.7Ca0.3)TiO<3-y>Sn, the value range of x is 0.1-0.7, and the value range of y is 0-0.06. The (1-x)Ba(Ti0.8Zr0.2)O<3-x>(Ba0.7Ca0.3)TiO<3-y>Sn thin film material provided by the invention has multiphase coexistence near room temperature, with the introduction of Sn, the Curie temperature is reduced, so that the (1-x)Ba(Ti0.8Zr0.2)O<3-x>(Ba0.7Ca0.3)TiO<3-y>Sn thin film materialobtains large electrocaloric temperature change near room temperature, thereby facilitating the enlarging of the working temperature range; and the material is good in application prospect in the field of electric card refrigeration devices.

Description

technical field [0001] The invention belongs to the technical field of ceramic compositions with barium titanate as the base material, and in particular relates to a film material with high electric card effect near room temperature and a preparation method thereof. Background technique [0002] With the rapid development of the microelectronics industry, in order to overcome the safety problems and limitations caused by thermal failure, the design and development of high-efficiency micro-cooling devices has attracted much attention. The electric card effect means that under adiabatic conditions, when an electric field is applied or removed to a ferroelectric material, the internal dipole of the material changes between a disordered state and an ordered state, causing a change in the temperature or entropy of the material. Designing a new refrigeration device based on the electric card effect has high energy efficiency, low cost, easy miniaturization, simple equipment struct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L43/10H01L43/12F25B21/00
CPCF25B21/00F25B2321/001H10N50/01H10N50/85Y02B30/00
Inventor 戴英熊书婷裴新美刘鑫坤刘琪
Owner WUHAN UNIV OF TECH
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