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Very high thermal stability with excellent dielectric, and non-ohmics properties of Mg-doped CaCu3Ti4.2O12 ceramics

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Abstract

In this work, the nominal CaCu3−xMgxTi4.2O12 (0.00, 0.05 and 0.10) ceramics were prepared by sintering pellets of their precursor powders obtained by a polymer pyrolysis solution method at 1100 °C for different sintering time of 8 and 12 h. Very low loss tangent (tanδ) < 0.009–0.014 and giant dielectric constant (ε′) ∼ 1.1 × 104–1.8 × 104 with excellent temperature coefficient (Δε′) less than ± 15% in a temperature range of − 60 to 210 °C were achieved. These excellent performances suggested a potent application of the ceramics for high temperature X8R and X9R capacitors. It was found that tanδ values decreased with increasing Mg2+ dopants due to the increase of grain boundary resistance (Rgb) caused by the very high density of grain, resulting from the substitution of small ionic radius Mg2+ dopants in the structure. In addition, CaCu3−xMgxTi4.2O12 ceramics displayed non-linear characteristics with the significant enhancements of a non-linear coefficient (α) and a breakdown field (Eb) due to Mg2+doping. The high values of ε′ (14012), α (13.64) and Eb (5977.02 V/cm) with very low tanδ value (0.009) were obtained in a CaCu2.90Mg0.10Ti4.2O12 ceramic sintered at 1100 °C for 8 h.

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Acknowledgements

This work was financially supported by the National Research Council of Thailand (NRCT) under Rajamangala University of Technology Rattanakosin (Grant No. 2562). It was also supported by the Thailand Research Fund through the Royal Golden Jubilee Ph.D. Program (PHD/0207/2558). The Nanotec-KKU Center of Excellence on Advanced Nanomaterials for Energy Production and Storage, Khon Kaen, Thailand and Integrated Nanotechnology Research Center (INRC), Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, 40002 Thailand are also grateful for their co-financial support. The authors express their appreciation to the National Metal and Materials Technology Center (MTEC), Thailand Science Park, Pathumthani, Thailand for dielectric measurements.

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Authors and Affiliations

  1. Integrated Nanotechnology Research Center (INRC) and Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand

    Ekaphan Swatsitang & Krissana Prompa

  2. Nanotec-KKU Center of Excellence on Advanced Nanomaterials for Energy Production and Storage, Khon Kaen University, Khon Kaen, 40002, Thailand

    Ekaphan Swatsitang

  3. School of General Science, Faculty of Liberal Arts, Rajamangala University of Technology Rattanakosin, Wang Klai Kangwon Campus, Hua Hin, Prachuap Khiri Khan, 77110, Thailand

    Thanin Putjuso

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  1. Ekaphan Swatsitang
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Correspondence to Thanin Putjuso.

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Swatsitang, E., Prompa, K. & Putjuso, T. Very high thermal stability with excellent dielectric, and non-ohmics properties of Mg-doped CaCu3Ti4.2O12 ceramics. J Mater Sci: Mater Electron 29, 12639–12651 (2018). https://doi.org/10.1007/s10854-018-9381-9

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