Enhancement of Giant Dielectric Response in CaCu3Ti4O12 Ceramics by Zn Substitution

Authors

  • Lei Ni,

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

    Corresponding author
    1. Laboratory of Dielectric Materials, Department of Materials Science and Engineering, Zhejiang University, Zhejiang, Hangzhou 310027, China
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  • D. W. Johnson—contributing editor

  • The present work was supported by National Science Foundation of China under grant no. 50832005 and 50672083, and National Basic Research Program of China under grant no. 2009CB929503.

†Author to whom correspondence should be addressed. e-mail: xmchen59@zju.edu.cn

Abstract

Zn-substituted CaCu3Ti4O12 ceramics were synthesized by solid-state sintering. Their microstructures and dielectric properties were investigated. Ca(Cu1−xZnx)3Ti4O12 single-phase structures were obtained up to x=0.1, and the Cu+/Cu2+ and Ti3+/Ti4+ mixed-valent structure was enhanced with increasing Zn substitution. The giant dielectric response was significantly enhanced by Zn substitution. The dielectric constant increased with increasing x, and a giant dielectric constant plateau as high as ∼9 × 104 was achieved for x=0.1 at 10 kHz, while that for x=0 was ∼3 × 104. The enhanced giant dielectric response was profoundly concerned with the modified mixed-valent structure.

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