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Effects of Li substitution on the sintering behavior, lattice vibration, bond covalence and dielectric properties of SrMgGe2O6 ceramics

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Abstract

Pyroxene structure SrMg1–xLi2xGe2O6 (x = 0.025–0.1) ceramics were prepared by a solid-state reaction method. Examines the impact of Li substitution on the sintering behavior, lattice vibration, bond covalence, and dielectric properties of SrMgGe2O6 ceramics. SrMgGe2O6 (space group: C2/c) was detected by XRD. Li+ can enter the lattice to form SrMg1–xLi2xGe2O6 solid solution. Through Rietveld refinement results, the effect of the Li+ doped content on the microwave performances of SMLG ceramics was analyzed. SEM results showed that SrMg0.925Li0.15Ge2O6 ceramics had the best surface morphology at 950 °C, and exhibited excellent microwave dielectric properties of εr = 5.91, Qf = 36,985 GHz, τf = -59 ppm/ °C. The relationship between the Qf value of SMLG ceramics and the packing fraction, and the bond valence is discussed. Calculating MgO6 octahedral distortion and bond energy can explain the change in τf value. SMLG Ceramics is a strong candidate in the LTCC.

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Acknowledgements

This study was supported by the Natural Science Foundation of China (Nos. 61761015), the Natural Science Foundation of Guangxi (Nos. 2017GXNSFFA198011, 2018GXNSFFA050001), and the High-Level Innovation Team and Outstanding Scholar Program of Guangxi Institute.

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  1. Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, School of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, China

    Yinghan He, Xiaoli Wei, Wenqian Luo, You Wu, Jianhui Yang, Xiuli Chen & Huanfu Zhou

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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by YH, XW, WL, YW, JY, XC, and HZ. The first draft of the manuscript was written by YH and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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He, Y., Wei, X., Luo, W. et al. Effects of Li substitution on the sintering behavior, lattice vibration, bond covalence and dielectric properties of SrMgGe2O6 ceramics. J Mater Sci: Mater Electron 34, 1435 (2023). https://doi.org/10.1007/s10854-023-10787-y

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