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

doi:10.1016/j.jeurceramsoc.2006.11.035

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 journal › Article › peer-review

77 Citations (Scopus)

Abstract

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 (τ_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, ε_r = 17.48, and τ_f = ∼0 ppm/°C.

Original language	English
Pages (from-to)	3087-3091
Number of pages	5
Journal	Journal of the European Ceramic Society
Volume	27
Issue number	8-9 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2006.11.035
Publication status	Published - 2007
Externally published	Yes

Keywords

Composites
Dielectric properties
Mixing
TiO
Tungstate

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

Access to Document

10.1016/j.jeurceramsoc.2006.11.035

Cite this

@article{d6c1440934fb4034a223c39e0ebaead4,

title = "Mixture behavior and microwave dielectric properties of (1 - x)CaWO4-xTiO2",

abstract = "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.",

keywords = "Composites, Dielectric properties, Mixing, TiO, Tungstate",

author = "Yoon, {Sung Hun} and Choi, {Geun Kyu} and Kim, {Dong Wan} and Cho, {Seo Yong} and Hong, {Kug Sun}",

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

year = "2007",

doi = "10.1016/j.jeurceramsoc.2006.11.035",

language = "English",

volume = "27",

pages = "3087--3091",

journal = "Journal of the European Ceramic Society",

issn = "0955-2219",

publisher = "Elsevier BV",

number = "8-9 SPEC. ISS.",

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TY - JOUR

T1 - Mixture behavior and microwave dielectric properties of (1 - x)CaWO4-xTiO2

AU - Yoon, Sung Hun

AU - Choi, Geun Kyu

AU - Kim, Dong Wan

AU - Cho, Seo Yong

AU - Hong, Kug Sun

N1 - 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: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2007

Y1 - 2007

N2 - 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.

AB - 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.

KW - Composites

KW - Dielectric properties

KW - Mixing

KW - TiO

KW - Tungstate

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