The Fabrication and Electrocaloric Effect of Bimodal-Grain Structure (Ba 0.60 Sr 0.40 )TiO 3 Using the Induced Abnormal Grain Growth Method

Bimodal-grain structure (Ba 0.6 Sr 0.4 )TiO 3 ceramics had been prepared using induced abnormal grain growth method (IAGG). Two grain size distributions, between 10 ∼ 20 μm and 100 ∼ 300 μm, were found during the sintering temperature of 1250 ∼ 1350°C. Our results suggested that the ultra-large grai...

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Published in:IOP conference series. Materials Science and Engineering 2019-11, Vol.678 (1), p.12138
Main Authors: Zhang, H F, Chen, X, Gao, J, Lam, K H, Liang, S D, Fei, L F, Mak, C L, Chen, J F
Format: Article
Language:English
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Summary:Bimodal-grain structure (Ba 0.6 Sr 0.4 )TiO 3 ceramics had been prepared using induced abnormal grain growth method (IAGG). Two grain size distributions, between 10 ∼ 20 μm and 100 ∼ 300 μm, were found during the sintering temperature of 1250 ∼ 1350°C. Our results suggested that the ultra-large grain exhibited the high dielectric and ferroelectric properties comparable to the single crystal. At the same time, the fine-grain caused a phase diffusion transition at the Curie temperature about 20°C. The direct measured electrocaloric effect showed that the best performance is achieved with Δ T of 0.6 K, and Δ S of 1.02 J kg −1 K −1 near room temperature and electric field strength of 2 MV/m.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/678/1/012138