Electrocaloric Effect in Different Oriented BaZr0.15Ti0.85O3 Single Crystals

Yun Ou; Chihou Lei; Dongliang Shan

doi:10.3390/ma15197018

Electrocaloric Effect in Different Oriented BaZr_0.15Ti_0.85O₃ Single Crystals

Materials (Basel). 2022 Oct 10;15(19):7018. doi: 10.3390/ma15197018.

Authors

Yun Ou¹, Chihou Lei², Dongliang Shan³

Affiliations

¹ School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, China.
² Department of Aerospace and Mechanical Engineering, Saint Louis University, Saint Louis, MI 63103-1110, USA.
³ Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education, School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China.

Abstract

The electrocaloric effect of ferroelectrics is promising for new solid-state refrigeration. However, the current research on the electrocaloric effect of bulk ferroelectrics mainly focuses on (001) orientation. Thus, we studied the electrocaloric effect of BaZr_0.15Ti_0.85O₃ single crystals with different orientations through the nonlinear thermodynamic approach and entropy analysis. The results show that the dipolar entropy of (111)-oriented BaZr_0.15Ti_0.85O₃ single crystals exhibits a greater change after applying an external electric field, compared with (001)- and (110)-orientations, and the (001)-oriented electrocaloric responses are consistent with experimental observations. The (111)-oriented BaZr_0.15Ti_0.85O₃ single crystals have a more significant electrocaloric response, resulting in a broader work temperature range with a large electrocaloric effect. These insights offer an alternative way to enhance the electrocaloric response of ferroelectric single crystals.

Keywords: barium zirconate titanate; broad work temperature range; electrocaloric effect; oriented single crystal.

Abstract

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