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Title: Unification of the negative electrocaloric effect in Bi1/2Na1/2TiO3-BaTiO3 solid solutions by Ba1/2Sr1/2TiO3 doping
Authors: Uddin, S
Zheng, GP 
Iqbal, Y
Ubic, R
Yang, J
Issue Date: 2013
Source: Journal of applied physics, 2013, v. 114, no. 21, 213519, p. 213519-1-213519-8
Abstract: The microscopic mechanisms of the negative electrocaloric effect (ECE) of the single-phase (1-x)(0.94Bi(1/2)Na(1/2)TiO(3)-0.06BaTiO(3))-xBa(1/2)Sr(1/2)TiO(3) (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 (Delta T) to only negative values. The origin of the uniform negative ECE of BNT-BT-BST is discussed.
Publisher: American Institute of Physics
Journal: Journal of applied physics 
ISSN: 0021-8979
EISSN: 1089-7550
DOI: 10.1063/1.4842935
Rights: © 2013 AIP Publishing LLC.
This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in S. Uddin et al., J. Appl. Phys. 114, 213519 (2013) and may be found at https://dx.doi.org/10.1063/1.4842935
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