Phenomenological modeling of phase transitions and electrocaloric effect in Ba(Zr0.2Ti0.8)O3-(Ba0.7Ca0.3)TiO3

被引：9
|
作者：
Du, Bingfeng [1 ]
Ma, Wenhui [1 ]
机构：
[1] Shantou Univ, Dept Phys, Shantou, Peoples R China
来源：
JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2019年 / 102卷 / 05期
关键词：
TEMPERATURE; CERAMICS; PIEZOELECTRICITY; POLARIZATION;
D O I：
10.1111/jace.16111
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Ba(Zr0.2Ti0.8)O-3-x(Ba0.7Ca0.3)TiO3 (BZT-xBCT) is a promising lead-free ferroelectric system. In this paper, we present two sets of free energy coefficients and carry out phenomenological modeling to study the phase transition and electrocaloric effect. The calculated phase diagram is in excellent quantitative agreement with experiments. Furthermore, we propose a new method based on effective internal electric field to simulate polarization in the macroscopic paraelectric state of ferroelectric relaxor. The computed composition and temperature-dependent entropy and temperature change induced by electrocaloric effect are in good agreement with the measured data available for single crystal.
引用
收藏
页码：2604 / 2610
页数：7
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