Electrocaloric Effect in Ba(Zr,Ti)O3-( Ba,Ca)TiO3 Ceramics Measured Directly

被引：64
作者：
Sanlialp, Mehmet [1 ,2 ]
Shvartsman, Vladimir V. [1 ,2 ]
Acosta, Matias [3 ]
Lupascu, Doru C. [1 ,2 ]
机构：
[1] Univ Duisburg Essen, Inst Mat Sci, Univ Str 15, D-45141 Essen, Germany
[2] Univ Duisburg Essen, Ctr Nanointegrat Duisburg Essen CENIDE, Univ Str 15, D-45141 Essen, Germany
[3] Tech Univ Darmstadt, Inst Mat Sci, Alarich Weiss Str 2, D-64287 Darmstadt, Germany
来源：
JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2016年 / 99卷 / 12期
关键词：
ferroelectricity/ferroelectric materials; dielectric materials/properties; differential scanning calorimetry; barium titanate; lead-free ceramics; SOLID-SOLUTIONS; TEMPERATURE;
D O I：
10.1111/jace.14456
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：
In this paper, we report on studies of the electrocaloric (EC) effect in lead-free (1 - x) Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 ceramics with compositions range between 0.32 <= x <= 0.45. The EC effect was measured directly using a modified differential scanning calorimeter. The maximum EC temperature change, Delta T-direct = 0.33 K under an electric field of 2 kV/mm, was observed for the composition with x = 0.32 at similar to 63 degrees C. We found that the EC effect peaks not only around the Curie temperature but also at the transition between the ferroelectric phases with different symmetries. A strong discrepancy observed between the results of the direct measurements and indirect estimations points out that using Maxwell's equations is invalid for the thermodynamic nonequilibrium conditions that accompany only partial (incomplete) poling of ceramics. We also observe a nonlinearity of the EC effect above the Curie temperature and in the temperature range corresponding to the tetragonal ferroelectric phase.
引用
收藏
页码：4022 / 4030
页数：9
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