Mixture behavior and microwave dielectric properties of (1 - x)CaWO4-xTiO2

Sung Hun Yoon, Geun Kyu Choi, Dong Wan Kim, Seo Yong Cho, Kug Sun Hong

Research output: Contribution to journalArticlepeer-review

87 Citations (Scopus)


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 (τf = -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, εr = 17.48, and τf = ∼0 ppm/°C.

Original languageEnglish
Pages (from-to)3087-3091
Number of pages5
JournalJournal of the European Ceramic Society
Issue number8-9 SPEC. ISS.
Publication statusPublished - 2007
Externally publishedYes

Bibliographical note

Funding Information:
This research was supported by a grant from the Center for Advances Materials Processing (CAMP) of the 21st Century Frontier R&D Program funded by the Ministry of Commerce Industry and Energy (MOCIE), Republic of Korea.

Copyright 2008 Elsevier B.V., All rights reserved.


  • Composites
  • Dielectric properties
  • Mixing
  • TiO
  • Tungstate

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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