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Very low loss tangent, high dielectric and non-ohmic properties of Ca1−1.5xPrxCu3Ti4O12 ceramics prepared by the sol–gel process

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Abstract

In this work, Ca1−1.5xPrxCu3Ti4O12 (0.00, 0.02, 0.04 and 0.06) ceramics were prepared by the sol–gel process. Very low loss tangent (tanδ) ∼0.016–0.022 and high dielectric constant (ε ′) ∼6174–8469 with temperature coefficients less than ±15% over the temperature range of −75 to 135 °C were observed in all Pr3+-doped CaCu3Ti4O12 ceramics. ε ′ decreased with increasing Pr3+ ion due to the decrease of oxygen vacancies and grain size, resulting from the substitution of small ionic radius Pr3+ ion in the structure. X-ray absorption near edge spectroscopy (XANES) confirmed the decrease of Ti3+/Ti4+ and Cu+/Cu2+ ratios with increasing Pr3+ ions. In addition, all Ca1−1.5xPrxCu3Ti4O12 ceramics displayed non-linear characteristics. Non-linear coefficient (α) and breakdown field (E b) of all ceramic samples can be enhanced by Pr3+ doping with the highest α value of ~14.74 and E b of ~5640 V/cm−1 in sample with x = 0.02. Effect of Pr3+ doping on phase composition and microstructure of samples were studied using X-ray diffraction and scanning electron microscopy coupled with energy dispersive X-rays spectroscopy.

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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. 2561). The Nanotec-KKU Center of Excellence on Advanced Nanomaterials for Energy Production and Storage, Khon Kaen 40002, Thailand and Integrated Nanotechnology Research Center (INRC), Department of Physics, Faculty of Science, Khon Kaen University are also grateful for their co-financial supports. The authors express their appreciation to the National Metal and Materials Technology Center (MTEC), Thailand Science Park, Pathumthani, Thailand for dielectric measurements. The Synchrotron Light Research Institute (SLRI), Nakhon Ratchasima, Thailand is acknowledged for XANES measurements.

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Authors and Affiliations

  1. Department of Physics, Faculty of Science, Integrated Nanotechnology Research Center (INRC), Nanotec-KKU Center of Excellence on Advanced Nanomaterials for Energy Production and Storage, Khon Kaen University, Khon Kaen, 40002, Thailand

    Ekaphan Swatsitang

  2. School of General Science, Faculty of Liberal Arts, Rajamangala University of Technology Rattanakosin, Wang Klai Kangwon Campus, Hua Hin, Prachaubkerekhan, 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., Putjuso, T. Very low loss tangent, high dielectric and non-ohmic properties of Ca1−1.5xPrxCu3Ti4O12 ceramics prepared by the sol–gel process. J Mater Sci: Mater Electron 28, 18966–18976 (2017). https://doi.org/10.1007/s10854-017-7850-1

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