Spark Plasma Sintering of Barium Zirconate Titanate/Carbon Nanotube Composites with Colossal Dielectric Constant and Low Dielectric Loss

Authors

  • Yong Jun Wu,

    Corresponding author
    1. Laboratory of Dielectric Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
      †Author to whom correspondence should be addressed. e-mail: yongjunwu@zju.edu.cn
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  • Shao Hua Su,

    1. Laboratory of Dielectric Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
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  • Ji Peng Cheng,

    1. Laboratory of Dielectric Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
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  • Xiang Ming Chen

    1. Laboratory of Dielectric Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
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    • *Member, The American Ceramic Society.


  • K. Kakegawa—contributing editor

  • This work was financially supported by the National Natural Science Foundation of China, under Grant No. 50872121 and 50832005.

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

Abstract

Ba(Zr0.2Ti0.8)O3/carbon nanotube composites were prepared by spark plasma sintering and characterized by SEM and dielectric spectrometer. The composites exhibit colossal dielectric constant up to several 105 with relatively low dielectric loss over a wide temperature range from 250 to 400 K. For composite with 0.025 wt% CNTs, the dielectric constant and dielectric loss at 50°C and 1 kHz were 6.1 × 105 and 0.074, respectively. The high dielectric constant can be explained by the Maxwell–Wagner polarization originating from the CNTs and Ba(Zr0.2Ti0.8)O3 interfaces and microcapacitance microstructure.

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