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Dielectric properties and nonlinear I–V electrical behavior of (Ni2+, Zr4+) co-doping CaCu3Ti4O12 ceramics

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Abstract

Ni2+ and Zr4+ co-doped CaCu3Ti4O12 ceramics were successfully prepared by the sol–gel method. X-ray diffraction study reveals that single cubic perovskite CaCu3Ti4O12 phase was formed in all CaCu2.95Ni0.05Ti4−xZrxO12 samples. The SEM micrographs revealed that the microstructures change significantly with Ni2+/Zr4+ co-doping and sintering temperature while the average grain size grow up to 4.75 µm for CaCu2.95Ni0.05Ti3.9Zr0.1O12 sample sintered at 1100 °C for 8 h. Besides, all the samples show good nonlinear I–V electrical behavior. Further, the dielectric loss (tanδ) of CaCu2.95Ni0.05Ti3.9Zr0.1O12 sample shows the lowest value about 0.026 while the grain size reaches the maximum value. The dielectric constant (ε′) tends to be independent of temperature range from 20 to 180 °C when the measured frequency is above 20 kHz. These results indicate that Ni2+/Zr4+ co-doping can improve the dielectric and electrical properties of CaCu3Ti4O12.

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Acknowledgements

This work was supported by National Natural Science Foundation of China (NSFC) (Grant Nos. 51602214, 11604234, 11404236 and 51702226), Natural Science Foundation of Shanxi Province (Grant Nos. 201601D202010 and 201701D221078).

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Authors and Affiliations

  1. College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan, 030024, People’s Republic of China

    Jianqin Guo, Li Sun, Qing Ni, Ensi Cao, Wentao Hao, Yongjia Zhang & Yuan Tian

  2. College of Physics and Electrical Engineering, Anyang Normal University, Anyang, 455000, People’s Republic of China

    Lin Ju

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  1. Jianqin Guo
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Correspondence to Li Sun.

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Guo, J., Sun, L., Ni, Q. et al. Dielectric properties and nonlinear I–V electrical behavior of (Ni2+, Zr4+) co-doping CaCu3Ti4O12 ceramics. Appl. Phys. A 124, 635 (2018). https://doi.org/10.1007/s00339-018-2060-0

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