The electrocaloric effect around the orthorhombic-tetragonal first-order phase transition in BaTiO3

被引：64

作者：

Bai, Yang ^{[1
]}

Ding, Kai ^{[1
]}

Zheng, Guang-Ping ^{[2
]}

Shi, San-Qiang ^{[2
]}

Cao, Jiang-Li ^{[1
]}

Qiao, Lijie ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Minist Educ, Key Lab Environm Fracture, Beijing 100083, Peoples R China

[2] Hong Kong Polytech Univ, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China

来源：

AIP ADVANCES | 2012年 / 2卷 / 02期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1063/1.4732146

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This paper demonstrates the electrocaloric effect (ECE) around BaTiO3's orthorhombic-tetragonal first-order phase transition. By manipulating a field-induced transition of a metastable phase in the thermal hysteresis zone, a huge exothermic or endothermic peak appears after first applying or removing electric fields because of the energy change of lattice structure. A large ECE of Delta T/E = 1.4K . m/MV, equaling to latent heat, is achieved under 10kV/cm at 10 degrees C. The entropy change for polarization ordering alone induces an ECE two orders of magnitude lower under the same condition. It confirms the dominant factor to ECE of the energy flow due to the structural phase transition. Copyright 2012 Author(s). This article is distributed under a Creative Commons Attribution 3.0 Unported License. [http://dx.doi. org/10.1063/1.4732146]

引用

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