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Temperature induced phase transformations and negative electrocaloric effect in (Pb,La)(Zr,Sn,Ti)O3 antiferroelectric single crystal
- 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.
- Subjects :
- Phase transition
Materials science
Condensed matter physics
General Physics and Astronomy
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Ferroelectricity
Pyroelectricity
Phase (matter)
0103 physical sciences
Electrocaloric effect
Curie temperature
Orthorhombic crystal system
010306 general physics
0210 nano-technology
Phase diagram
Subjects
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