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Advanced Ferroelectricity$
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Robert Blinc

Print publication date: 2011

Print ISBN-13: 9780199570942

Published to Oxford Scholarship Online: January 2012

DOI: 10.1093/acprof:oso/9780199570942.001.0001

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Electrocaloric effect in ferroelectrics and ferroelectric thin films

Electrocaloric effect in ferroelectrics and ferroelectric thin films

Chapter:
(p.203) 8 Electrocaloric effect in ferroelectrics and ferroelectric thin films
Source:
Advanced Ferroelectricity
Author(s):

Robert Blinc

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199570942.003.0008

A theory of the electrocaloric effect is presented. It is shown that the electrocaloric effect in ferroelectrics is maximal at the electric‐field‐induced first‐order phase transition, whereas it is maximal in relaxors at the electric‐field‐induced critical end point. The maximum efficiencies ΔTE and ΔSE for various samples are presented. It is shown that in relaxors a giant electrocaloric effect takes place at the critical end point where also the electromechanical response is largest. A universal expression for the maximum temperature change in the saturation regime is derived that is valid both for electrocaloric and magnetocaloric systems.

Keywords:   electrocaloric effect, ferroelectrics, relaxors, thin films, maximum efficiencies, giant electrocaloric effect, critical end point, magnetocaloric effects

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