Negative/positive electrocaloric effect in antiferroelectric squaric acid

Using the previously developed model, we study the electrocaloric effect (ECE) in antiferroelectric crystals of squaric acid, where the low-temperature polarization reorientation by the external electric field has been earlier predicted to be a two-stage process with the intermediate ferrielectric p...

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Bibliographic Details
Published in:Journal of applied physics 2023-03, Vol.133 (9)
Main Author: Moina, A. P.
Format: Article
Language:English
Subjects:
Antiferroelectricity
Applied physics
Electric fields
Ferroelectric materials
Gruneisen parameter
Low temperature
Mathematical models
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Summary:Using the previously developed model, we study the electrocaloric effect (ECE) in antiferroelectric crystals of squaric acid, where the low-temperature polarization reorientation by the external electric field has been earlier predicted to be a two-stage process with the intermediate ferrielectric phase. The T- E landscape of the model entropy is explored. The ECE, characterized by the electric Grüneisen parameter, is found to be negative in the antiferroelectric phase. In the ferrielectric phase, it is positive at low fields but becomes slightly negative below the transition to the ferroelectric phase. In the ferroelectric phase, the ECE is positive at all temperatures and fields. The negative EC temperature shift Δ T of the largest magnitude is predicted to be around − 2.7 K at 200 kV/cm. The supercritical behavior of the Grüneisen parameter in the crossover region between two bicritical end points is studied.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0136590