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A novel sol–gel route to synthesize (Sr $_{0.5}$ Ba $_{0.5}$ )Nb₂O₆ ceramics with enhanced electrocaloric effect

Laboratory of Dielectric Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China

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Shu Ya Wu

Laboratory of Dielectric Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China

E-mail Address: wushuya@zju.edu.cn

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Xiao Qiang Liu

Laboratory of Dielectric Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China

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, and

Xiang Ming Chen

Laboratory of Dielectric Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China

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https://doi.org/10.1142/S2010135X17500126Cited by:4 (Source: Crossref)

Abstract

(Sr $_{0.5}$ Ba $_{0.5}$ )Nb₂O₆ ultra-fine powders were synthesized by a novel sol–gel route, and the mechanism of the reaction was discussed. SrCO₃, BaCO₃, oxalate niobium and citric acid were used to initiate the sol–gel process, and ethylene glycol (EG) was added to further polymerize the cross-linking structure. The evolution of the (Sr $_{0.5}$ Ba $_{0.5}$ )Nb₂O₆ phase, the reaction process and the microstructures were investigated by X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy, DSC-TG and scanning electron microscopy. The synthesis temperature of the (Sr $_{0.5}$ Ba $_{0.5}$ )Nb₂O₆ powders reached as low as 1200 $^{\circ}$ C, and the size and morphology of the powders were controlled by temperature. By adjusting the calcination temperature, we obtained (Sr $_{0.5}$ Ba $_{0.5}$ )Nb₂O₆ powders with uniform sizes of 20nm to 500nm. Then, dense (Sr $_{0.5}$ Ba $_{0.5}$ )Nb₂O₆ ceramics were successfully prepared using these ultrafine powders. Finally, an enhanced electrocaloric effect (ECE) value of 0.35 $^{\circ}$ C was obtained at 100kV/cm.

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Vol. 07, No. 02

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History

Received 15 February 2017

Revised 3 April 2017

Accepted 4 April 2017

Published: 2 May 2017

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This is an Open Access article published by World Scientific Publishing Company. It is distributed under the terms of the Creative Commons Attribution 4.0 (CC-BY) License. Further distribution of this work is permitted, provided the original work is properly cited.

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