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

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

来源：Journal of the European Ceramic Society, 2022, 42(11): 4580-4586.

DOI：10.1016/j.jeurceramsoc.2022.04.032

• Ceramics
• Dielectric properties
• Wireless communication
• Low-permittivit

High-speed signal propagation systems require dielectric ceramics with low relative permittivity (epsilon r) and a highquality 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 degrees C with comprehensive microwave dielectric properties: a low relative permittivity (epsilon r) of 5.3, a moderate quality factor (Qxf) of 18,200 GHz at 16.3 GHz, and a temperature coefficient of resonant frequency (tau f) of - 66.2 ppm/degrees C. Good chemical compatibility with Ag electrode and thermal expansion coefficient of 25.4 ppm/degrees C was achieved demonstrating the potential applications as dielectric resonances in wireless communications and substrates in low-temperature cofired ceramics.

• 单位
  Huazhong University of Science and Technology; Guilin University Of Technology; 1