Yoon, Sung Hun Choi, Geun-Kyu Kim, Dong-Wan Cho, Seo-Yong Hong, Kug Sun 2024-01-21T01:31:36Z 2024-01-21T01:31:36Z 2021-09-05 2007-03 0955-2219 https://pubs.kist.re.kr/handle/201004/134609 The microwave dielectric characteristics and mixture behavior of (1-x)CaWO4-xTiO2 ceramics prepared with conventional solid-state route were studied using a network analyzer and X-ray power diffraction, respectively. The CaWO4 compound had good properties (low permittivity and high quality factor) for microwave applications, but it had a high negative temperature coefficient of resonant frequency (tau(f) = -53). Hence, in order to tune the dielectric properties, (1-x)CaWO4-xTiO2 were prepared for different values of x. X-ray powder diffraction and SEM analysis revealed that CaWO4 and TiO2 coexisted as a mixture. The mixture formation and dielectric properties could be explained by mixture rule. In particular, at x = 2.6, good microwave dielectric properties were obtained: Qf = 27,000, epsilon(r) = 17.48, and tau(f) = similar to 0 ppm/degrees C. (C) 2007 Published by Elsevier Ltd. English ELSEVIER SCI LTD 0-3 COMPOSITES CONSTANT SYSTEM Mixture behavior and microwave dielectric properties of (1-x)CaWO4-xTiO(2) Article 10.1016/j.jeurceramsoc.2006.11.035 1 JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, v.27, no.8-9, pp.3087 - 3091 JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 27 8-9 3087 3091 scie scopus 000246331700065 2-s2.0-34047168708 Materials Science, Ceramics Materials Science Article; Proceedings Paper 0-3 COMPOSITES CONSTANT SYSTEM mixing composites dielectric properties tungstate TiO2