Sequence of structural transitions and electrocaloric properties in (Ba1-xCax)(Zr0.1Ti0.9)O-3 ceramics

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Output type: Chapter in book

UM6P affiliated Publication?: Yes

Author list: Kaddoussi, H.; Lahmar, A.; Gagou, Y.; Manoun, B.; Chotard, J. N.; Dellis, J. -L.; Kutnjak, Z.; Khemakhem, H.; Elouadi, B.; El Marssi, M.

Publication year: 2017

Volume number: 713

Start page: 164

End page: 179

Number of pages: 16

ISSN: 0925-8388

Languages: English (EN-GB)

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The influence of the incorporation of Calcium in lead-free ferroelectric Ba(Zr0.1Ti0.9)O-3 perovskite on its structural phase transition, dielectric, pyroelectric, ferroelectric, and electrocaloric effect was investigated. Room temperature X-ray diffraction study allowed the identification of a continuous solid solution in the composition range 0 <= x <= 20 mol% with a rhombohedral to orthorhombic structural transition beyond 15mol%. Structural investigation of X-ray diffraction as a function of temperature reveals four different structural regions for the compositions with low content of Ca and three regions for the compositions with high Ca-content. Using heat flow measurements and dielectric investigations, two sequences of structural phase transitions were elucidated. The tetragonal-to- orthorhombic and orthorhombic-to-rhombohedral phase transitions induced by temperature variation were found to decrease with the increase of the Ca2+ content, while the cubic-to-tetragonal phase transition temperature remained almost unchanged and exhibited a dielectric permittivity maximum observed around the composition of x = 15mol%. The electrocaloric temperature change Delta T was calculated from two methods: the thermal variation of P-E hysteresis loops and pyroelectric current. The highest electrocaloric Delta T/DE = 0.24 K mm/kV was found for the composition x = 0.05. The largest electrocaloric responsivity around 0.30 K mm/kV was observed for this composition at Curie temperature using direct method. (C) 2017 Elsevier B.V. All rights reserved.


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Last updated on 2021-17-10 at 23:16