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BaTiO3-based electrocaloric material with good temperature stability near room temperature as well as preparation method and application of BaTiO3-based electrocaloric material

A stable, room temperature technology, applied in the field of BaTiO3-based electric card materials and its preparation, can solve the problems of weak electric card response, high response temperature of ferroelectric ceramic electric card, poor temperature stability near room temperature, etc., to avoid pollution, The effect of improving the response intensity and the preparation method is simple and efficient

Inactive Publication Date: 2022-03-01
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of BaTiO with good temperature stability around room temperature 3 Base electric card material and its preparation method and application, for solving BaTiO 3 The base ferroelectric ceramic electric card responds to the problem of high temperature, poor temperature stability and weak response of the electric card near room temperature

Method used

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  • BaTiO3-based electrocaloric material with good temperature stability near room temperature as well as preparation method and application of BaTiO3-based electrocaloric material
  • BaTiO3-based electrocaloric material with good temperature stability near room temperature as well as preparation method and application of BaTiO3-based electrocaloric material
  • BaTiO3-based electrocaloric material with good temperature stability near room temperature as well as preparation method and application of BaTiO3-based electrocaloric material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] a Ba 1-x La x Ti 0.9 sn 0.1 o 3 Electric card material, the value of x is 0, that is, the chemical formula is BaTi 0.9 sn 0.1 o 3 , its preparation method comprises the following steps:

[0035] 1) BaCO 3 , La 2 o 3 、TiO 2 and SnO 2 Raw material according to Ba 1-x La x Ti 0.9 sn 0.1 o 3 Stoichiometric weighing, using a planetary ball mill for mixed ball milling, and ball milling at a speed of 300r / min for 8 hours to obtain uniformly mixed raw material powder;

[0036] 2) The raw material powder obtained in step 1) is dried and then calcined to obtain a calcined block, wherein the calcining is carried out in a box furnace from room temperature to 1200°C at a heating rate of 5°C / min, and after holding for 2 hours, the The temperature rate was 5°C / min to cool down to 500°C, and then naturally cooled to room temperature.

[0037] 3) The calcined block obtained in step 2) is ball milled again, the ball milling process is the same as step 1), and then dried...

Embodiment 2

[0041] a Ba 1-x La x Ti 0.9 sn 0.1 o 3 Electric card material, the value of x is 0.006, that is, the chemical formula is Ba 0.994 La 0.006 Ti 0.9 sn 0.1 o 3 , its preparation method comprises the following steps:

[0042] 1) BaCO 3 , La 2 o 3 、TiO 2 and SnO 2 Raw material according to Ba 1-x La x Ti 0.9 sn 0.1 o 3 Stoichiometric weighing, using a planetary ball mill for mixed ball milling, and ball milling at a speed of 300r / min for 8 hours to obtain uniformly mixed raw material powder;

[0043] 2) The raw material powder obtained in step 1) is dried and then calcined to obtain a calcined block, wherein the calcining is carried out in a box furnace from room temperature to 1200°C at a heating rate of 5°C / min, and after holding for 2 hours, the The temperature rate was 5°C / min to cool down to 500°C, and then naturally cooled to room temperature.

[0044] 3) The calcined block obtained in step 2) is ball milled again, the ball milling process is the same as s...

Embodiment 3

[0048] a Ba 1-x La x Ti 0.9 sn 0.1 o 3 Electric card material, the value of x is 0.007, that is, the chemical formula is Ba 0.993 La 0.007 Ti 0.9 sn 0.1 o 3 , its preparation method comprises the following steps:

[0049] 1) BaCO 3 , La 2 o 3 、TiO 2 and SnO 2 Raw material according to Ba 1-x La x Ti 0.9 sn 0.1 o 3 Stoichiometric weighing, using a planetary ball mill for mixed ball milling, and ball milling at a speed of 300r / min for 8 hours to obtain uniformly mixed raw material powder;

[0050] 2) The raw material powder obtained in step 1) is dried and then calcined to obtain a calcined block, wherein the calcining is carried out in a box furnace from room temperature to 1200°C at a heating rate of 5°C / min, and after holding for 2 hours, the The temperature rate was 5°C / min to cool down to 500°C, and then naturally cooled to room temperature.

[0051] 3) The calcined block obtained in step 2) is ball milled again, the ball milling process is the same as s...

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Abstract

The invention discloses a BaTiO3-based electrocaloric material with good temperature stability near the room temperature and a preparation method and application thereof, the chemical formula of the material is Ba < 1-x > LaxTi < 0.9 > Sn < 0.1 > O3, and the value range of x is 0-0.008. According to the Ba (1-x) LaxTi0. 9Sn0. 1O3 electrocaloric material prepared by the invention, a multiphase coexisting system can be provided at room temperature by introducing the Sn element, the phase change temperature of the material is moved to be close to the room temperature, then the phase change temperature of the material is further moved to be close to the room temperature by further regulating and controlling La < 3 + >, the electrocaloric response strength of the material close to the room temperature is improved, and the electrocaloric response strength of the material close to the room temperature is improved. Meanwhile, due to the introduction of La < 3 + >, the phase-change dispersion degree is improved, and the electrocaloric response and temperature stability of the material near the room temperature are greatly improved. The Ba < 1-x > LaxTi < 0.9 > Sn < 0.1 > O < 3 > electrocaloric material provided by the invention has high electrocaloric response strength near the room temperature and can keep good temperature stability in a wide temperature range, and the preparation method of the electrocaloric refrigeration material, which is environment-friendly and has practical application value, is provided for an electrocaloric refrigeration device.

Description

technical field [0001] The invention belongs to the technical field of electric card refrigeration, and in particular relates to a BaTiO with good temperature stability around room temperature 3 Base electric card material and its preparation method and application. Background technique [0002] In recent years, the worsening of the greenhouse effect has increased the demand for low-carbon refrigeration technologies. The exploration of new solid-state refrigeration technologies has attracted extensive attention, including thermoelectric effect, magnetic card effect, spring / press card effect, and electric card effect (ECE). ECE is directly driven by electric energy, which has the advantages of high energy conversion efficiency, simple equipment, easy integration, and environmental protection. ECE has become a hot spot in solid-state refrigeration technology. [0003] ECE refers to the order-disorder transition of dipoles in a polar material during the application and remov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622
CPCC04B35/468C04B35/622C04B2235/3227C04B2235/3293
Inventor 许宁刘琦马家辉雒玉欣
Owner SHAANXI UNIV OF SCI & TECH
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