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Article: Modeling of enhanced electrocaloric effect above the Curie temperature in relaxor ferroelectrics

TitleModeling of enhanced electrocaloric effect above the Curie temperature in relaxor ferroelectrics
Authors
KeywordsDielectric stiffness
Electrocaloric effect
Pauli's master equation
Phenomenological theory
Relaxor ferroelectric
Issue Date2011
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/actamat
Citation
Acta Materialia, 2011, v. 59 n. 14, p. 5574-5583 How to Cite?
AbstractThe electrocaloric (EC) effect offers promise as a means to realize solid-state refrigeration, which requires EC materials possessing a pronounced pyroelectric effect over a broad temperature range. Pauli's master equation is adopted to investigate the recently observed phenomenon of enhanced EC effect above the Curie temperature in relaxor ferroelectrics. The proposed approach allows the EC coefficient to be determined within the framework of classic Landau-Ginzburg-Devonshire thermodynamics and the Maxwell relation, taking into account both the depolarization effect and dielectric permittivity dispersion based on the concept of superparaelectricity and the nanopolar region. We analyze three contributions of the EC effect: temperature-dependent dielectric dispersion, intrinsic pyroelectric effect and enhanced dielectric stiffness. The maximum EC coefficient is determined through the derivatives of the three components with respect to temperature. The proposed approach, in which the evolution of polarization correlation length is accounted for, cannot only provide a microscopic explanation for the thermally driven enhancement of EC responses, but also improves upon the existing models for estimating the EC effect in paraelectric phase of relaxors. Finally, some potential approaches for engineering the enhancement of EC coefficient are also suggested. © 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/157130
ISSN
2015 Impact Factor: 5.058
2015 SCImago Journal Rankings: 3.683
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorShi, YPen_US
dc.contributor.authorSoh, AKen_US
dc.date.accessioned2012-08-08T08:45:27Z-
dc.date.available2012-08-08T08:45:27Z-
dc.date.issued2011en_US
dc.identifier.citationActa Materialia, 2011, v. 59 n. 14, p. 5574-5583en_US
dc.identifier.issn1359-6454en_US
dc.identifier.urihttp://hdl.handle.net/10722/157130-
dc.description.abstractThe electrocaloric (EC) effect offers promise as a means to realize solid-state refrigeration, which requires EC materials possessing a pronounced pyroelectric effect over a broad temperature range. Pauli's master equation is adopted to investigate the recently observed phenomenon of enhanced EC effect above the Curie temperature in relaxor ferroelectrics. The proposed approach allows the EC coefficient to be determined within the framework of classic Landau-Ginzburg-Devonshire thermodynamics and the Maxwell relation, taking into account both the depolarization effect and dielectric permittivity dispersion based on the concept of superparaelectricity and the nanopolar region. We analyze three contributions of the EC effect: temperature-dependent dielectric dispersion, intrinsic pyroelectric effect and enhanced dielectric stiffness. The maximum EC coefficient is determined through the derivatives of the three components with respect to temperature. The proposed approach, in which the evolution of polarization correlation length is accounted for, cannot only provide a microscopic explanation for the thermally driven enhancement of EC responses, but also improves upon the existing models for estimating the EC effect in paraelectric phase of relaxors. Finally, some potential approaches for engineering the enhancement of EC coefficient are also suggested. © 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.en_US
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/actamaten_US
dc.relation.ispartofActa Materialiaen_US
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Acta Materialia. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Acta Materialia, 2011, v. 59 n. 14, p. 5574-5583. DOI: 10.1016/j.actamat.2011.05.030-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectDielectric stiffnessen_US
dc.subjectElectrocaloric effecten_US
dc.subjectPauli's master equationen_US
dc.subjectPhenomenological theoryen_US
dc.subjectRelaxor ferroelectricen_US
dc.titleModeling of enhanced electrocaloric effect above the Curie temperature in relaxor ferroelectricsen_US
dc.typeArticleen_US
dc.identifier.emailSoh, AK: aksoh@hkucc.hku.hken_US
dc.identifier.authoritySoh, AK=rp00170en_US
dc.description.naturepostprinten_US
dc.identifier.doi10.1016/j.actamat.2011.05.030en_US
dc.identifier.scopuseid_2-s2.0-79960385347en_US
dc.identifier.hkuros200550-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79960385347&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume59en_US
dc.identifier.issue14en_US
dc.identifier.spage5574en_US
dc.identifier.epage5583en_US
dc.identifier.eissn1873-2453-
dc.identifier.isiWOS:000294091400019-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridSoh, AK=7006795203en_US
dc.identifier.scopusauthoridShi, YP=12345267700en_US

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