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Relationship between crystal structure and dielectric properties of non-stoichiometric Mg2 +xAl4 +ySi5 +zO18-based microwave ceramics

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Abstract

The effects of non-stoichiometry on the phase composition, crystal structure, and dielectric properties of Mg2 + xAl4 + ySi5 + zO18 ceramics were systematically studied. The stoichiometry deviation of Mg2 + xAl4 + ySi5 + zO18 ceramics leads to a change in the [MgO6] oxygen octahedron and symmetry of crystal structure, which has a significant impact on their dielectric properties. The theoretical polarizability improves linearly with the increase of stoichiometric ratio deviation, resulting in a slight increase of permittivity from 4.93 to 5.08. The center symmetry of the [(Si4Al2)O18] hexagonal ring in Mg2 + xAl4 + ySi5 + zO18 ceramics plays a crucial role in determining the Q×f value. The enhanced center symmetry of [(Si4Al2)O18] hexagonal ring from asymmetric structure to centrosymmetric structure improves the Q×f values of Mg2 + xAl4 + ySi5 + zO18 ceramics. The reduction of τf value is correlated to the decrease of Mg–O bond value and the increase of [MgO6] oxygen octahedral distortion. The Mg2.2Al4Si5O18 ceramic presents excellent dielectric properties at 1440 °C for 4h: εr = 4.97, Q×f = 100,268 GHz, and τf = −12.07ppm/ °C.

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Acknowledgements

This work was financial supported by the Natural Science Foundation of Hunan Province (Grant Nos. 2021JJ30831). The use of facilities in the State Key Laboratory for Powder Metallurgy at Central South University is acknowledged. The authors would also like to thank Chinese Academy of Science, Sharing Service Platform of CAS Large Research Infrastructure, Hefei National Synchrotron Radiation Laboratory.

Funding

This work was financial supported by the Natural Science Foundation of Hunan Province (Grant Nos. 2021JJ30831).

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Authors and Affiliations

  1. State Key Laboratory for Powder Metallurgy, Central South University, Changsha, 410083, China

    Fan Liu, Wen Ran, Hao Li, Fei Liu & Shaojun Liu

  2. Shenzhen Research Institute, Central South University, Shenzhen, 518057, China

    Shaojun Liu

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

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Liu, F., Ran, W., Li, H. et al. Relationship between crystal structure and dielectric properties of non-stoichiometric Mg2 +xAl4 +ySi5 +zO18-based microwave ceramics. J Mater Sci: Mater Electron 34, 152 (2023). https://doi.org/10.1007/s10854-022-09500-2

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