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Research Article | Open Access

Sintering behavior, phase composition, microstructure, and dielectric characteristics of garnet-type Ca3Fe2Ge3O12 microwave ceramics

Guoqiang He,,1, Yanjun Liu,1, Huanfu Zhou( ), Xiuli Chen
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

Peer review under responsibility of The Chinese Ceramic Society.

1 These authors contributed equally to this work.

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Graphical Abstract

Abstract

This paper describes the solid-state production of a unique yellowish-grey microwave dielectric ceramic, Ca3Fe2Ge3O12 (CFG). Rietveld refinement demonstrated that CFG corresponds to a cubic system (space group 230: Ia 3 d). The relative density of the ceramic initially increased and then decreased with the sintering temperature, reaching a maximum of 96.92% at 1330 ℃. According to scanning electron microscopy and energy-dispersive spectroscopy results, the CFG ceramic grains are spherical and consistent in size; furthermore, they have distinct grain boundaries and a uniform distribution of the four constituent elements. The CFG ceramic has a superior crystal structure and a high crystallinity, according to transmission electron microscopy. Raman spectroscopy revealed that the Q×f value of the ceramic and the full width at half maximum of the Raman peak are negatively correlated. The ceramic possesses the best overall dielectric characteristics after sintering at 1330 ℃ for 4 h: εr = 10.31, Q×f = 82636 GHz, and τf = −45.66 × 10−6 ℃−1, showing that it is a promising candidate for use in mobile devices.

Keywords

Microwave dielectric propertiesLow permittivityGarnet-type structureCa3Fe2Ge3O12

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Journal of Materiomics
Volume 9 Issue 3,
May 2023
Pages 472-481
DOI: 10.1016/j.jmat.2022.12.005
Cite this article:
He G, Liu Y, Zhou H, et al. Sintering behavior, phase composition, microstructure, and dielectric characteristics of garnet-type Ca3Fe2Ge3O12 microwave ceramics. Journal of Materiomics, 2023, 9(3): 472-481. https://doi.org/10.1016/j.jmat.2022.12.005

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Received: 29 September 2022
Revised: 11 December 2022
Accepted: 20 December 2022
Published: 23 January 2023
© 2023 The Authors.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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