Volumetric effects in electrocaloric response of ferroelectric thin films

Arlı, Cihan and Atılgan, Ali Rana and Mısırlıoğlu, Burç (2023) Volumetric effects in electrocaloric response of ferroelectric thin films. Journal of Materials Chemistry C, 11 (3). pp. 1134-1143. ISSN 2050-7526 (Print) 2050-7534 (Online)

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We theoretically analyze the contribution of volumetric changes to the caloric response of ferroelectric thin films on misfitting substrates. A self-consistent formalism employing the appropriate thermodynamic relations accounting for the elastic boundary conditions is developed, allowing for the calculation of the volumetric contribution to the caloric temperature changes, similar to the elastocaloric effect. The latter stems from the strain response of a ferroelectric film to an applied electric field. We apply the formalism to tetragonal BaTiO3 (BT) in film form constrained on a cubic substrate. It is found that, contrary to the electrocaloric response, the elastocaloric-like response is negative and precedes the transition temperature where the intrinsic electrocaloric response reaches its maximum. Such a behaviour is predicted to cause a reduction in the total caloric temperature change before the transition, revealing a competition between the two effects. Larger misfit strains reduce the elastocaloric-like contribution and the intrinsic electrocaloric contribution governs the caloric temperature change. Overall our findings point out the importance of the volumetric changes in the caloric response of ferroelectric thin films.
Item Type: Article
Divisions: Faculty of Engineering and Natural Sciences
Depositing User: Ali Rana Atılgan
Date Deposited: 14 Apr 2023 15:05
Last Modified: 14 Apr 2023 15:05
URI: https://research.sabanciuniv.edu/id/eprint/45362

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