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Sintering Behavior, Crystal Structure, and Microwave Dielectric Properties of Li2Y9(SiO4)6O2F Ceramics with Near-Zero τf

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Abstract

This study delves into the microwave dielectric properties of Li2Y9(SiO4)6O2F ceramics, synthesized using the conventional solid-state method. By employing x-ray diffraction analysis and meticulous data refinement across various temperatures, we unequivocally confirm the hexagonal crystal structure of Li2Y9(SiO4)6O2F ceramics. The refined lattice parameters, observed at a sintering temperature of 1275°C, exhibit a = b = 9.33318 Å, c = 6.71725 Å, with a corresponding unit cell volume of V = 506.73529 Å3. In-depth scrutiny of the microstructure of the ceramics’ grains using scanning electron microscopy (SEM) reveals an optimal relative density of 96.2%. Subsequently, the study explores the impact of porosity, packing fraction, relative density, and Si-O bond valence (VSi-O) on the microwave dielectric properties of Li2Y9(SiO4)6O2F ceramics. Notably, the Li2Y9(SiO4)6O2F ceramic sintered at 1275°C demonstrates superior performance metrics, boasting an εr value of 14.28, a Q × f product of 16,760 GHz (at f = 9.4 GHz), and a temperature coefficient of frequency (τf) at 3.14 ppm/°C. This comprehensive investigation contributes valuable insights into optimizing the microwave dielectric characteristics of Li2Y9(SiO4)6O2F ceramics for potential applications in advanced electronic devices.

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Acknowledgments

This work was supported by the graduate scientific research innovation project of Shaoyang University (Grant No. CX2022SY035), the National Natural Science Foundation of China (Grant No. 52102123), and the Scientific Research Fund of Hunan Provincial Education Department (No. 21C0588).

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Authors and Affiliations

  1. College of Information Engineering, Shaoyang University, Shaoyang, 422000, China

    Deyin Liang, Tingting Liao, Feng Dong, Ammar Oad & Yingxiang Li

  2. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 611731, China

    Bin Tang, Feng Si, Zixuan Fang, Zitao Shi & Jingjing Chen

  3. School of Civil Engineering and Geomatics, Southwest Petroleum University, Chengdu, 610500, China

    Fei Wang

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  1. Deyin Liang
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Liang, D., Liao, T., Dong, F. et al. Sintering Behavior, Crystal Structure, and Microwave Dielectric Properties of Li2Y9(SiO4)6O2F Ceramics with Near-Zero τf. J. Electron. Mater. 53, 3223–3230 (2024). https://doi.org/10.1007/s11664-024-11045-5

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