Entropy-change measurement of electrocaloric effect of BaTiO3 single crystal

被引：91

作者：

Bai, Yang ^{[1
]}

Ding, Kai ^{[1
]}

Zheng, Guang-Ping ^{[2
]}

Shi, San-Qiang ^{[2
]}

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：

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE | 2012年 / 209卷 / 05期

基金：

美国国家科学基金会;

关键词：

electrocaloric effect; entropy change; ferroelectrics; phase transitions;

D O I：

10.1002/pssa.201127695

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We demonstrated a characterization method of entropy-change measurement for the study of the electrocaloric effect (ECE). After the specific heat capacity was measured under different applied fields using a differential scanning calorimeter (DSC) accompanied with DC power supply, the electrocaloric Delta S was calculated from the temperature integral of specific heat capacities based on the basic definition of entropy. The Delta S-T curve of BaTiO3 single crystal showed a sharp peak around T-c, which increased gradually and shifted to higher temperature with the rise of applied field. A high ECE with Delta S=1.9 J/kg K and Delta T=1.6 K is achieved under a quite low field of 10 kV/cm. The results agreed with the thermodynamic calculation. It provides a direct, precise, and time-efficient method for the electrocaloric studies. (c) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：941 / 944

页数：4

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