Novel high-Q×f (1 − x)CeO2–xCaF2(0.2 ≤ x ≤ 0.6) microwave dielectric ceramics sintered at medium temperatures

Gao, Yufeng; Jiang, Juan; Wang, Jinzhao; Gan, Lin; Zhang, Tianjin; Gao, Yufeng; Jiang, Juan; Wang, Jinzhao; Gan, Lin; Zhang, Tianjin

doi:2022.59.6.929

J. Korean Ceram. Soc. > Volume 59(6); 2022 > Article

Original Article

Journal of the Korean Ceramic Society 2022;59(6): 929-935.
doi: https://doi.org/10.1007/s43207-022-00223-y

Novel high-Q×f (1 − x)CeO₂–xCaF₂(0.2 ≤ x ≤ 0.6) microwave dielectric ceramics sintered at medium temperatures

Yufeng Gao, Juan Jiang, Jinzhao Wang, Lin Gan

, Tianjin Zhang

Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed By the Province and Ministry, Ministry of Education Key Laboratory for Green Preparation and Application of Functional Materials, School of Material Science and Engineering, Hubei University, 368 Youyi Avenue, Wuhan 430062, Hubei, China

Correspondence

Lin Gan ,Email: ganlin@hubu.edu.cn
Tianjin Zhang ,Email: zhangtj@hubu.edu.cn

Received: March 20, 2022; Revised: May 17, 2022 Accepted: June 7, 2022. Published online: July 1, 2022.

ABSTRACT

In this work, a new binary microwave dielectric ceramic system of (1 − x)CeO₂–xCaF₂ (0.2 ≤ x ≤ 0.6) was fabricated at medium sintering temperatures. The compositional effects of on the sintering behavior, phase compositions, microstructures, and microwave dielectric properties of the samples were studied. High relative density levels (> 95%) were achieved in the (1 − x)CeO₂–xCaF₂ samples at the sintering temperatures ranging from 1100 to 1350 °C. An increase in the content of CaF₂ resulted in a decrease in the dielectric constant, an increase in the Q × f level, and a negative shift of the τ_f value. The optimal microwave dielectric properties of ε_r = 11.3, Q × f = 53,000 GHz, and τ_f = − 102 ppm/°C were obtained in the sample of (1 − x)CeO₂–xCaF₂ with x = 0.6 when sintered at 1300 °C.

Key words: Microwave dielectric ceramics · Cubic fl uorite structure · CeO₂