Temperature induced phase transformations and negative electrocaloric effect in (Pb,La)(Zr,Sn,Ti)O3 antiferroelectric single crystal
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...
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Veröffentlicht in: | Journal of applied physics 2017-10, Vol.122 (15) |
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Hauptverfasser: | , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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. |
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ISSN: | 0021-8979 1089-7550 |
DOI: | 10.1063/1.4986849 |