Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/7694
Title: Electrocaloric properties of Ba0. 8Sr0. 2Ti1-xZrxO3 (0? x? 0.1) system: The balance between the nature of the phase transition and phase coexistence
Authors: Şanlı, Keriman
Adem, Umut
Şanlı, Keriman
Adem, Umut
Keywords: Electrocaloric effect
Barium titanate
Critical point
Diffuse phase transition
Polymorphic phase transition
Issue Date: Feb-2020
Publisher: Elsevier Ltd.
Source: Şanlı, K., and Adem, U. (2020). Electrocaloric properties of Ba0. 8Sr0. 2Ti1-xZrxO3 (0≤ x≤ 0.1) system: The balance between the nature of the phase transition and phase coexistence. Ceramics International, 46(2), 2213-2219. doi:10.1016/j.ceramint.2019.09.206
Abstract: We investigate the electrocaloric effect of Ba0.8Sr0.2Ti1-xZrxO3 (0 ≤ x ≤ 0.1) system by comparing the electrocaloric temperature change (ΔT) of different compositions belonging to the different regions of the phase diagram. We show that as the amount of Zr increases, electrocaloric temperature change initially decreases as the phase transition gets diffuse then increases again as the composition of the samples are located closer to the critical point where different ferroelectric phases coexist. Since the critical point is reached at relatively low Zr substitution levels (i.e. around x = 0.07), the phase transition doesn't get too diffuse and thefore the compositions between x = 0 and x = 0.10 (which contains higher Zr than the critical point composition) have comparable ΔT values. Electrocaloric efficiency of these compositions (x = 0.03, 0.05 and 0.07) is around 0.20 K mm/kV at 20 kV/cm. We discuss the results in terms of the balance between the nature of the phase transition and proximity to the critical point, based on the phase diagram.
URI: https://doi.org/10.1016/j.ceramint.2019.09.206
https://hdl.handle.net/11147/7694
ISSN: 0272-8842
0272-8842
1873-3956
Appears in Collections:Materials Science and Engineering / Malzeme Bilimi ve Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

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