Giant Electrocaloric Response Over A Broad Temperature Range in Modified BaTiO3 Ceramics

Authors

  • Xiao-Shi Qian,

    1. Department of Electrical Engineering and Materials Research Institute, The Pennsylvania State University, PA, USA
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  • Hui-Jian Ye,

    1. Materials Research Institute, The Pennsylvania State University, PA, USA
    2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, PR China
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  • Ying-Tang Zhang,

    1. Materials Research Institute, The Pennsylvania State University, PA, USA
    2. School of Material Science and Engineering, Institute of Functional Material, Shaanxi University of Technology, Hanzhong, PR China
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  • Haiming Gu,

    1. Department of Electrical Engineering and Materials Research Institute, The Pennsylvania State University, PA, USA
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  • Xinyu Li,

    1. Department of Electrical Engineering and Materials Research Institute, The Pennsylvania State University, PA, USA
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  • C. A. Randall,

    1. Materials Research Institute, The Pennsylvania State University, PA, USA
    2. Department of Materials Science and Engineering, The Pennsylvania State University, PA, USA
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  • Q. M. Zhang

    Corresponding author
    1. Department of Electrical Engineering and Materials Research Institute, The Pennsylvania State University, PA, USA
    2. Tsinghua University, Beijing, PR China
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Abstract

A giant electrocaloric effect (ECE) near room temperature is reported in a lead-free bulk inorganic material. By tuning Ba(ZrxTi1–x)O3 compositions which also exhibit relaxor ferroelectric response to near the invariant critical point, the Ba(ZrxTi1–x)O3 bulk ceramics at x ∼ 0.2 exhibit a large adiabatic temperature drop of 4.5 K, a large isothermal entropy change of 8 J kg−1 K−1, and a large EC coefficient (|ΔTc/ΔE| = 0.52 × 10−6 KmV−1 and ΔS/ΔE = 0.93 × 10−6 J m kg−1 K−1 V−1) over a 30 K temperature range. These properties added together indicate a general solution of the electrocaloric materials with high performance for practical cooling applications.

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