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J. Korean Ceram. Soc. > Volume 59(6); 2022 > 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)CeO2xCaF2(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)CeO2xCaF2 (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)CeO2xCaF2 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 τf value. The optimal microwave dielectric properties of εr = 11.3, Q × f = 53,000 GHz, and τf = − 102 ppm/°C were obtained in the sample of (1 − x)CeO2xCaF2 with x = 0.6 when sintered at 1300 °C.
Key words: Microwave dielectric ceramics · Cubic fl uorite structure · CeO2
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