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Effect of non-stoichiometry on the microstructure and microwave dielectric properties of Ca5Mg4+xV6O24 (− 0.05 ≤ x ≤ 0.15) ceramics

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Abstract

Ca5Mg4+xV6O24 (− 0.05 ≤ x ≤ 0.15) ceramics were prepared via a conventional solid-state reaction route. XRD patterns and Raman spectra confirmed that a single garnet phase was formed in all samples. The full-width-at-half maximum of Raman peaks revealed that an appropriate excess of magnesium ions improves the ordering degree of cations and quality factor (Q × f) value. The dielectric constant (εr) was closely correlated with the relative density and ion polarizability. The connections among the Q × f value, lattice energy, and packing fraction were discussed. As for the variation of the temperature coefficient of resonant frequency (τf), it was explained by the bond energy of V–O. Ca5Mg4+xV6O24 (x = 0.05) ceramic sintered at 825 °C achieved optimal microwave dielectric properties: ɛr = 9.93, Q × f = 56192 GHz, and τf = − 48.3 ppm/°C.

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Authors and Affiliations

  1. School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China

    Bo Li, Wei Liu & Hansheng Leng

  2. State Key Laboratory of Electronic Thin Films and Integrated Devices, Chengdu, China

    Bo Li

  3. National Engineering Research Center of Electromagnetic Radiation Control Materials, Chengdu, China

    Bo Li

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  1. Bo Li
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  2. Wei Liu
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  3. Hansheng Leng
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Correspondence to Bo Li.

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Li, B., Liu, W. & Leng, H. Effect of non-stoichiometry on the microstructure and microwave dielectric properties of Ca5Mg4+xV6O24 (− 0.05 ≤ x ≤ 0.15) ceramics. J Mater Sci 55, 3795–3802 (2020). https://doi.org/10.1007/s10853-019-04287-w

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