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Improved microwave dielectric properties of the (Sr1−3x/2Lax)2Ti1−yCeyO4 ceramics

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Abstract

(Sr1 − 3x/2Lax)2TiO4 ceramics (0 ≤ x ≤ 0.02) with the tetragonal Ruddlesden-Popper structure (I4/mmm) were synthesized through the conventional solid-state methods. The phase composition, chemical structure and the microwave dielectric properties of the (Sr1 − 3x/2Lax)2TiO4 ceramics were investigaed. The single phase was obtained for x < 0.02. The substitution of La3+ for Sr2+ could decrease the ionic polarizability and the cell volume, Which slightly decrease the dielectric constant (εr), the quality factor (Q × f) were closely related to the packing fraction, while the temperature coefficient of resonant frequency (τf) is correlated to the tolerance factor. Which attributed to the increase of the Q × f value and the decrease of the τf value. The optimum microwave dielectric properties for (Sr1-3x/2Lax)2TiO4 were obtained in x = 0.015 (εr = 34.07, Q × f = 86,450 GHz and τf =  + 91.8 ppm/oC). Besides, in order to further decrease the τf value, the Sr1.955La0.03Ti1 − yCeyO4 ceramics were also synthesized through the conventional solid-state methods. A near-zero τf value was achieved in y = 0.7 (εr = 20.18, Q × f = 87651 GHz and τf =  − 0.2 ppm/°C).

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (NSFC-51772107), the Major Technological Innovation Projects in Hubei Province (2018AAA039), the Research Projects Supported by the Equipment Development Department (1807WM0004), and the Innovation Team Program of Hubei Province, China (2019CFA004). The authors are grateful to the Analytical and Testing Center, Huazhong University of Science and Technology, for SEM analyses.

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Authors and Affiliations

  1. School of Optical and Electronic Information, Key Lab of Functional Materials for Electronic Information (B) of MOE, Huazhong University of Science and Technology, Wuhan, 430074, People’s Republic of China

    Meng-Qi Xie, Xiao-Qiang Song, Kang Du, Zheng-Yu Zou, Wen-Zhong Lu & Wen Lei

  2. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, People’s Republic of China

    Wen-Zhong Lu & Wen Lei

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  1. Meng-Qi Xie
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Xie, MQ., Song, XQ., Du, K. et al. Improved microwave dielectric properties of the (Sr1−3x/2Lax)2Ti1−yCeyO4 ceramics. J Mater Sci: Mater Electron 31, 13541–13548 (2020). https://doi.org/10.1007/s10854-020-03910-w

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