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Dielectric response mechanism and suppressing high-frequency dielectric loss in Y2O3 grafted CaCu3Ti4O12 ceramics

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Abstract

Ca1−3x/2Y x Cu3Ti4O12 (0 ≤ x ≤ 0.67) ceramics were fabricated by a conventional solid-state reaction method. Lattice parameter of the system increases linearly with increasing x. The high-frequency dielectric loss of Ca1−3x/2Y x Cu3Ti4O12 is suppressed significantly while the dielectric constant decreases slightly. The dielectric, impedance and modulus spectra reveals that the giant dielectric response associates with the Maxwell–Wagner effect. The decrease of dielectric constant is just related to the capacitance of grain boundaries. The dielectric relaxation behavior of the system is independent of Y substitution while the correlation between conductivity and frequency becomes stronger in Y substituted CaCu3Ti4O12. It suggests that space charge and long-range hopping of carriers play important roles on the low-frequency dielectric properties. The decrease of grain-boundary activation energy with Y substitution indicates that the concentration of oxygen vacancies increases in grain boundaries. The mechanisms of depressing low-frequency dielectric constant and high-frequency dielectric loss was discussed.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 11264010, 11564010, 51402196), the Natural Science Foundation of Guangxi (GA139008, 2016GXNSFDA380027), and the China Postdoctoral Science Foundation (Grants 2014M552229 and 2015T80915).

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Authors and Affiliations

  1. Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, College of Materials Science and Engineering, Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, Guilin University of Technology, Guilin, 541004, People’s Republic of China

    Feifei Han, Shaokai Ren, Jianming Deng, Tianxiang Yan, Xing Ma & Laijun Liu

  2. School of Physical Science & Technology and Guangxi Key Laboratory for Relativistic Astrophysics, Guangxi University, Nanning, 530004, People’s Republic of China

    Biaolin Peng

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  1. Feifei Han
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  2. Shaokai Ren
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Correspondence to Biaolin Peng or Laijun Liu.

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Han, F., Ren, S., Deng, J. et al. Dielectric response mechanism and suppressing high-frequency dielectric loss in Y2O3 grafted CaCu3Ti4O12 ceramics. J Mater Sci: Mater Electron 28, 17378–17387 (2017). https://doi.org/10.1007/s10854-017-7671-2

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  • DOI: https://doi.org/10.1007/s10854-017-7671-2

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