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Dielectric properties and nonlinear I–V electrical behavior of (Li1+, Al3+) co-doped CaCu3Ti4O12 ceramics

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Abstract

(Li1+, Al3+) co-doped CaCu3Ti4O12 ceramics (CaCu3−2xLixAlxTi4O12, x = 0.05, 0.1, 0.15) were prepared by a sol–gel method and were sintered at 1020–1080 °C for 8 h to improve the geometric microstructure, dielectric and nonlinear I–V electrical properties. Notably, very high dielectric constant of 1 × 105 with good dielectric-frequency as well as dielectric-temperature stability can be achieved in CaCu2.8Li0.1Al0.1Ti4O12 ceramic sintered at 1060 °C. The average grain sizes, resistivity and the non-Ohmic properties are also improved compared to pure CaCu3Ti4O12. These results indicate that (Li1+, Al3+) co-doping at the Cu2+ site can improve the dielectric properties of CaCu3Ti4O12, supporting the internal barrier layer capacitance effect of Schottky barriers at grain boundaries.

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  • 26 August 2019

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Acknowledgements

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

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Authors and Affiliations

  1. Key Lab of Advanced Transducers and Intelligent Control System, Ministry of Education, Taiyuan University of Technology, Taiyuan, 030024, People’s Republic of China

    Li Sun

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

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

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

    Lin Ju

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Correspondence to Li Sun or Wentao Hao.

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Sun, L., Ni, Q., Guo, J. et al. Dielectric properties and nonlinear I–V electrical behavior of (Li1+, Al3+) co-doped CaCu3Ti4O12 ceramics. Appl. Phys. A 124, 428 (2018). https://doi.org/10.1007/s00339-018-1862-4

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