Electric-field-induced phase transition and electrocaloric effect in PMN-PT

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Electric-field-induced phase transition and electrocaloric effect in PMN-PT

Authors
Type
Published Article
Journal
Physical Review B
Publisher
American Physical Society (APS)
Publication Date
Aug 18, 2017
Accepted Date
Aug 18, 2017
Volume
96
Issue
5
Identifiers
DOI: 10.1103/physrevb.96.054116
Source
MyScienceWork
Keywords
License
Green

Abstract

Ferroelectric perovskite oxides possess a large electrocaloric (EC) effect, but usually at high temperatures near the ferroelectric/paraelectric phase transition temperature, which limits their potential application as next-generation solid-state cooling devices. We use classical molecular dynamics to study the electric-field-induced phase transitions and EC effect in PMN-PT (PbMg 1/3 Nb 2/3 O 3-PbTiO 3). We find that the maximum EC strength of PMN-PT occurs within the morphotropic phase boundary (MPB) region at 300 K. The large adiabatic temperature change is caused by easy rotation of polarization within the MPB region.

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