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Enhanced Electrocaloric Effects in Spark Plasma-Sintered Ba0.65Sr0.35TiO3-Based Ceramics at Room Temperature

Authors

  • Xiao Qiang Liu,

    Corresponding author
    • Laboratory of Dielectric Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou, China
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  • Ting Ting Chen,

    1. Laboratory of Dielectric Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou, China
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  • Yong Jun Wu,

    1. Laboratory of Dielectric Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou, China
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  • Xiang Ming Chen

    1. Laboratory of Dielectric Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou, China
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    • Member, The American Ceramic Society

Author to whom correspondence should be addressed. e-mail: xqliu@zju.edu.cn

Abstract

Improvement of electrocaloric effect was investigated in the lead-free undoped and Mn-doped Ba0.65Sr0.35TiO3 ceramics prepared by spark plasma sintering process. Owing to the merit of spark plasma sintering process, a fully dense undoped and Mn-doped Ba0.65Sr0.35TiO3 ceramics with fine grain sizes could be obtained. The electrocaloric (EC) effect can be significantly enhanced from 0.83 K for conventional sintered Ba0.65Sr0.35TiO3 to 3.08 K for spark plasma-sintered Mn-doped Ba0.65Sr0.35TiO3 ceramics since the dielectric strength was dramatically increased. This work indicated an effective way to achieve the significantly enhanced EC effect in a lead-free system at room temperature.

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