Field-induced phase transitions and enhanced double negative electrocaloric effects in (Pb,La)(Zr,Sn,Ti)O3 antiferroelectric single crystal

Fangping Zhuo, Qiang Li, Huimin Qiao, Qingfeng Yan, Yiling Zhang, Xiaoqing Xi, Xiangcheng Chu, Xifa Long, Wenwu Cao

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23 Scopus citations

Abstract

Field-induced phase transitions and electrocaloric effect have been studied in (Pb,La)(Zr,Sn,Ti)O3 (PLZST) antiferroelectric single crystal. Temperature dependent dielectric, Raman spectra, as well as in situ domain evolution demonstrated that the order of phase transitions during heating is in the sequence of orthorhombic antiferroelectric → tetragonal antiferroelectric → cubic paraelectric. Enhanced negative electrocaloric effect value of -3.6 °C and electrocaloric strength of 0.3 K mm/kV at 125 °C have been achieved. Double negative effects (-0.7 °C at 45 °C and -3.6 °C at 125 °C) and a relatively large positive effect (1 °C) near Curie temperature (190 °C) have been found in the PLZST single crystal. Moreover, microscopic dipoles and a phenomenological Landau-type model were employed to understand these unusual electrocaloric effects. Enhanced negative effect and the coexistence of both negative and positive effects in one material are promising for us to develop practical solid-state cooling devices with high efficiency.

Original languageEnglish (US)
Article number133901
JournalApplied Physics Letters
Volume112
Issue number13
DOIs
StatePublished - Mar 26 2018

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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