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Temperature induced phase transformations and negative electrocaloric effect in (Pb,La)(Zr,Sn,Ti)O3 antiferroelectric single crystal

Authors :
Qiang Li
Fangping Zhuo
Qingfeng Yan
Hong-Hui Wu
Wenwu Cao
Xiaoqing Xi
Xiangcheng Chu
Yiling Zhang
Source :
Journal of Applied Physics. 122:154101
Publication Year :
2017
Publisher :
AIP Publishing, 2017.

Abstract

Temperature induced phase transitions and electrocaloric effect (ECE) of (Pb,La)(Zr,Sn,Ti)O3 (PLZST) single crystals have been comprehensively studied. Based on the in situ evolution of domain structures and dielectric properties of the PLZST crystals, the phase transitions during heating are in the sequence of orthorhombic antiferroelectric → rhombohedral ferroelectric → cubic paraelectric. Coexistence of the negative and positive ECEs has been achieved in the PLZST single crystals. A negative ECE value of −1.26 °C and enhanced electrocaloric strength of −0.21 K mm/kV near the Curie temperature have been obtained. A modified Landau model gives a satisfactory description of the experimentally observed unusual ECE. Moreover, a temperature–electric field phase diagram is also established based on theoretical analysis. Our results will help people understand better the electrocaloric family, particularly on the negative and/or positive effect in antiferroelectrics and ferroelectrics.

Details

ISSN :
10897550 and 00218979
Volume :
122
Database :
OpenAIRE
Journal :
Journal of Applied Physics
Accession number :
edsair.doi...........c6449e664e9fc5f527cb858aa9b9751c
Full Text :
https://doi.org/10.1063/1.4986849