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

Changzhi Yin, Kang Du, Meng Zhang, Jiaqing Yang, Fei Wang, Yanbo Guo, Mingfei Cheng, Yiyang Cai, Xiaoqiang Song, Jibran Khaliq, Chunchun Li*, Wen Lei, Wenzhong Lu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)4580-4586
Number of pages7
JournalJournal of the European Ceramic Society
Volume42
Issue number11
Early online date20 Apr 2022
DOIs
Publication statusE-pub ahead of print - 20 Apr 2022

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