Unification of the Negative Electrocaloric Effect in Bi_1/2Na_1/2TiO₃-BaTiO₃ Solid Solutions by Ba_1/2Sr_1/2TiO₃ Doping

Authors

Sarir Uddin, Hong Kong Polytechnic University
Guang-Ping Zheng, Hong Kong Polytechnic University
Yaseen Iqbal, University of Peshawar
Rick Ubic, Boise State UniversityFollow
Junhe Yang, University of Shanghai for Science and Technology

Document Type

Article

Publication Date

12-2013

Abstract

The microscopic mechanisms of the negative electrocaloric effect (ECE) of the single-phase (1−x)(0.94Bi_1/2Na_1/2TiO₃-0.06BaTiO₃)-xBa_1/2Sr_1/2TiO₃ (BNT-BT-BST) perovskite solid solutions fabricated via the sol-gel technique are explored in this study. Dielectric and mechanical relaxation analyses are employed to investigate the ferroelectric and structural transitions of the samples. The electrocaloric properties of the samples were measured by thermodynamics Maxwell relations. The difference between the depolarization temperature (T_d) and the maximum dielectric constant temperature (T_m) was found to decrease with increasing BST content. Doping with BST stabilized the ferroelectric phase along with unifying the EC temperature changes (ΔT) to only negative values. The origin of the uniform negative ECE of BNT-BT-BST is discussed.

Copyright Statement

Copyright 2013 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in AIP Journal of Applied Physics, 114(21), 213519 and may be found at doi: 10.1063/1.4842935

Publication Information

Uddin, Sarir; Zheng, Guang-Ping; Iqbal, Yaseen; Ubic, Rick; and Yang, Junhe. (2013). "Unification of the Negative Electrocaloric Effect in Bi_1/2Na_1/2TiO₃-BaTiO₃ Solid Solutions by Ba_1/2Sr_1/2TiO₃ Doping". Journal of Applied Physics, 114(21), 213519-1 - 213519-8. https://doi.org/10.1063/1.4842935