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

Fangping Zhuo, Qiang Li, Qingfeng Yan, Yiling Zhang, Hong Hui Wu, Xiaoqing Xi, Xiangcheng Chu, Wenwu Cao

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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.

Original languageEnglish (US)
Article number154101
JournalJournal of Applied Physics
Volume122
Issue number15
DOIs
StatePublished - Oct 21 2017

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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