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Bond characteristics and microwave dielectric properties of temperature-stable (1-x)Mg2TiO4-xLi4/3Ti5/3O4 (0.15 ≤ x ≤ 0.9) spinel solid solutions

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Abstract

In this work, spinel-structured (1-x)Mg2TiO4-xLi4/3Ti5/3O4 (0.15 ≤ x ≤ 0.9) ceramic samples were fabricated by a conventional solid-state method. The samples exhibited a disordered-to-ordered-to-disordered structural transition with an increase in the x value. The compositional dependence of microwave dielectric properties of the samples was discussed with respect to the chemical bond characteristics. The dielectric constant (εr) was proved to be affected by the molar volume molecular polarizability and average bond ionicity (Afi). The quality factor (Q × f) was mainly dependent on the defect (i.e., Ti3+ and oxygen vacancy) population in the samples. Moreover, the temperature coefficient of the resonance frequency (τf) was confirmed to be affected by the Ti–O bond energy. The optimal microwave dielectric properties (εr = 26.0, Q × f = 36,500 GHz, and τf = 2.4 ppm/ºC) were achieved at x = 0.75.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 11774083 and 51902093).

Funding

This work was supported by the National Natural Science Foundation of China (Nos. 11774083 and 51902093).

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Authors and Affiliations

  1. Collaborative Innovation Center for Advanced Organic Chemical Materials Co-Constructed By the Province and Ministry, Ministry of Education Key Laboratory for Green Preparation and Application of Functional Materials, School of Material Science and Engineering, Hubei University, Wuhan, 430062, China

    Bing Zhang, Lin Gan, Juan Jiang, Jinzhao Wang & Tianjin Zhang

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

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Correspondence to Lin Gan or Tianjin Zhang.

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Zhang, B., Gan, L., Jiang, J. et al. Bond characteristics and microwave dielectric properties of temperature-stable (1-x)Mg2TiO4-xLi4/3Ti5/3O4 (0.15 ≤ x ≤ 0.9) spinel solid solutions. J Mater Sci: Mater Electron 35, 278 (2024). https://doi.org/10.1007/s10854-024-12056-y

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