Effect of sintering temperature and oxygen atmosphere on electrocaloric effect of BaTiO 3 ceramics

Xue-Chong Ren, Wei-Li Nie, Yang Bai () and Li-Jie Qiao

The European Physical Journal B: Condensed Matter and Complex Systems, 2015, vol. 88, issue 9, 1-5

Abstract: This paper demonstrates the effect of sintering parameters on the electrocaloric effect (ECE) in BaTiO 3 ferroelectric ceramics, especially the sintering temperature and atmosphere. The samples were prepared by solid-state reaction method. With the rise of sintering temperature from 1200 °C to 1350 °C, the grain size increases remarkably and the densification is improved. The 1350 °C sintered sample has better ferroelectricity and higher latent heat for ferroelectric-paraelectric phase transition than those of the 1200 °C sintered sample. Correspondingly, it exhibits much better ECE. If the sample is sintered in pure oxygen, instead of in air, all ferroelectricity, dielectric strength and ECE are further enhanced. The sample sintered at 1350 °C in oxygen exhibits an excellent ECE performance with ΔT max =1.37 K and ΔS max =1.75 J/kg K. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2015

Date: 2015
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DOI: 10.1140/epjb/e2015-60445-2

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