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Microwave dielectric properties of novel (1 − x)MgTiO3–xCa0.5Sr0.5TiO3 ceramics

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Abstract

In this work, the microstructure and microwave dielectric properties of novel (1 − x)MgTiO3–xCa0.5Sr0.5TiO3 (x = 0.035–0.045) ceramics were investigated. The samples were prepared via the solid-state sintering method using the pre-synthesized ultrafine MgTiO3 and (Ca0.5Sr0.5)TiO3 powders by molten-salt reaction. As the x value increases from 0.035 to 0.045, the quality factor (Q·f) of the samples presents an increase first and then a decrease, reaching the maximum of 70,000 with x = 0.0375. The dielectric constant (εr) increases monotonously with the increase of x, which is 20.96 when x = 0.0045. The temperature coefficient of resonant frequency (τf) progressively increases with increasing content of Ca0.5Sr0.5TiO3. When x = 0.004, the obtained 0.96MgTiO3–0.04Ca0.5Sr0.5TiO3 ceramics sintered at 1275 °C for 4 h display excellent microwave dielectric properties with an εr value of about 20.57, a relatively high Q·f value of roughly 58,000 GHz, and a near-zero τf value of approximately − 1.16 ppm/°C. Such ceramics might be a good candidate for high-performance microwave dielectric devices.

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Acknowledgements

The authors would like to thank the financial support for this work from the National Natural Science Foundation of China (Grant Nos. 11674035 and 61274015) and the Fundamental Research Funds for the Central Universities.

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Authors and Affiliations

  1. School of Science, China University of Geosciences, Beijing, 100083, People’s Republic of China

    Chuying Chen, Zhijian Peng & Luzhi Xie

  2. School of Science, Beijing University of Posts and Telecommunications, Beijing, 100876, People’s Republic of China

    Ke Bi & Xiuli Fu

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  1. Chuying Chen
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Chen, C., Peng, Z., Xie, L. et al. Microwave dielectric properties of novel (1 − x)MgTiO3–xCa0.5Sr0.5TiO3 ceramics. J Mater Sci: Mater Electron 31, 13696–13703 (2020). https://doi.org/10.1007/s10854-020-03927-1

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