Giant electrocaloric effect at the antiferroelectric-to-ferroelectric phase boundary in Pb(ZrxTi1–x)O3

Molecular dynamics simulations predict a giant electrocaloric effect at the ferroelectric-antiferroelectric phase boundary in PZT (PbTiO3-PbZrO3). These large-scale simulations also give insights into the atomistic mechanisms of the electrocaloric effect in Pb(ZrxTi1–x)O3. We predict a positive elec...

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Published in:Applied physics letters 2019-07, Vol.115 (2)
Main Authors: Kimmel, A. V., Gindele, O. T., Duffy, D. M., Cohen, R. E.
Format: Article
Language:English
Subjects:
Antiferroelectricity
Applied physics
Crossovers
Electric fields
Ferroelectric materials
Lead titanates
Molecular dynamics
Phase boundaries
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description Molecular dynamics simulations predict a giant electrocaloric effect at the ferroelectric-antiferroelectric phase boundary in PZT (PbTiO3-PbZrO3). These large-scale simulations also give insights into the atomistic mechanisms of the electrocaloric effect in Pb(ZrxTi1–x)O3. We predict a positive electrocaloric effect in ferroelectric PZT, but antiferroelectric PZT exhibits a negative-to-positive crossover with the increasing temperature or electric field. At the antiferroelectric-to-ferroelectric phase boundary, we find complex domain patterns. We demonstrate that the origin of the giant electrocaloric change of temperature is related to the easy structural response of the dipolar system to external stimuli in the transition region.
doi_str_mv 10.1063/1.5096592
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subjects Antiferroelectricity
Applied physics
Crossovers
Electric fields
Ferroelectric materials
Lead titanates
Molecular dynamics
Phase boundaries
title Giant electrocaloric effect at the antiferroelectric-to-ferroelectric phase boundary in Pb(ZrxTi1–x)O3
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