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Published in: Journal of Materials Science: Materials in Electronics 15/2019

04-07-2019

Structural, dielectric and electrocaloric properties of (Ba0.85Ca0.15)(Ti0.9Zr0.1−xSnx)O3 ceramics elaborated by sol–gel method

Authors: S. Belkhadir, A. Neqali, M. Amjoud, D. Mezzane, A. Alimoussa, E. Choukri, Y. Gagou, I. Raevski, M. El Marssi, Igor A. Luk’yanchuk, B. Rožič, Z. Kutnjak

Published in: Journal of Materials Science: Materials in Electronics | Issue 15/2019

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Abstract

Ferroelectric ceramics (Ba0.85Ca0.15)(Ti0.9Zr0.1−xSnx)O3 (x = 0.00, 0.02, 0.04, 0.06) were elaborated by sol–gel method. Structural investigation revealed co-existence of tetragonal (P4mm) and orthorhombic (Pmm2) symmetries at room temperature for the undoped ceramic, while only a tetragonal structure (P4mm) was observed for the doped ceramics. Dielectric measurements indicate a dielectric relaxation process at high temperatures which is essentially related to the hopping of oxygen vacancies \({\text{V}}_{\ddot{O}}\). Furthermore, a down shifting of the Curie temperature (TC) with increasing Sn4+ doping rate has been revealed. The temperature profiles of the Raman spectra unveiled the existence of polar nanoregions above the Curie temperature in all ceramics. The ferroelectric properties were found to be related to the microstructure. Electrocaloric effect was investigated in this system that revealed an electrocaloric responsivity of 0.225 × 10−6 K m/V for the composition with x = 0.04 Sn doping, where other remarkable physical properties were also observed.

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Metadata
Title
Structural, dielectric and electrocaloric properties of (Ba0.85Ca0.15)(Ti0.9Zr0.1−xSnx)O3 ceramics elaborated by sol–gel method
Authors
S. Belkhadir
A. Neqali
M. Amjoud
D. Mezzane
A. Alimoussa
E. Choukri
Y. Gagou
I. Raevski
M. El Marssi
Igor A. Luk’yanchuk
B. Rožič
Z. Kutnjak
Publication date
04-07-2019
Publisher
Springer US
Published in
Journal of Materials Science: Materials in Electronics / Issue 15/2019
Print ISSN: 0957-4522
Electronic ISSN: 1573-482X
DOI
https://doi.org/10.1007/s10854-019-01776-1

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