Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 44, Issue 37, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/44/37/375404
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Funding
- EPSRC [EP/G060940/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G060940/1] Funding Source: researchfish
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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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