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Publication Detail
Statistical mechanical lattice model of the dual-peak electrocaloric effect in ferroelectric relaxors and the role of pressure
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Dunne LJ, Valant M, Axelsson AK, Manos G, Alford NM
  • Publisher:
    IOP PUBLISHING LTD
  • Publication date:
    21/09/2011
  • Journal:
    J PHYS D APPL PHYS
  • Volume:
    44
  • Issue:
    37
  • Print ISSN:
    0022-3727
  • Language:
    EN
  • Keywords:
    GLASSY POLARIZATION BEHAVIOR, ROOM-TEMPERATURE, PHASE, PEROVSKITES
  • Addresses:
    Dunne, LJ
    Univ London Imperial Coll Sci Technol & Med
    Dept Mat
    London
    SW7 2AZ
    England

    London S Bank Univ
    Dept Syst Engn
    London
    SE1 0AA
    England
Abstract
Despite considerable effort, the microscopic origin of the electrocaloric (EC) effect in ferroelectric relaxors is still intensely discussed. Ferroelectric relaxors typically display a dual-peak EC effect, whose origin is uncertain. Here we present an exact statistical mechanical matrix treatment of a lattice model of polar nanoregions forming in a neutral background and use this approach to study the characteristics of the EC effect in ferroelectric relaxors under varying electric field and pressure. The dual peaks seen in the EC properties of ferroelectric relaxors are due to the formation and ordering of polar nanoregions. The model predicts significant enhancement of the EC temperature rise with pressure which may have some contribution to the giant EC effect.
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