Novel low-εr and lightweight LiBO2 microwave dielectric ceramics with good chemical compatibility with silver

Yin, Changzhi, Du, Kang, Zhang, Meng, Yang, Jiaqing, Wang, Fei, Guo, Yanbo, Cheng, Mingfei, Cai, Yiyang, Song, Xiaoqiang, Khaliq, Jibran, Li, Chunchun, Lei, Wen and Lu, Wenzhong (2022) Novel low-εr and lightweight LiBO2 microwave dielectric ceramics with good chemical compatibility with silver. Journal of the European Ceramic Society, 42 (11). pp. 4580-4586. ISSN 0955-2219

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Abstract

High-speed signal propagation systems require dielectric ceramics with low relative permittivity (εr) and a high-quality factor (Qxf). In this paper, a novel low-permittivity borate ceramic (LiBO2) was synthesized using a conventional solid-state reaction method. Based on the X-ray diffraction and Rietveld refinement, the LiBO2 crystallized into a monoclinic structure with a space group of P21/c. Dense and single-phase ceramic was obtained at 640 °C with comprehensive microwave dielectric properties: a low relative permittivity (εr) of 5.3, a moderate quality factor (Q×f) of 18,200 GHz at 16.3 GHz, and a temperature coefficient of resonant frequency (τf) of − 66.2 ppm/°C. Good chemical compatibility with Ag electrode and thermal expansion coefficient of 25.4 ppm/°C was achieved demonstrating the potential applications as dielectric resonances in wireless communications and substrates in low-temperature cofired ceramics.

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