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Title of article :
Microwave dielectric properties of scheelite (A = Ca, Sr, Ba) and wolframite (A = Mg, Zn, Mn) AMoO4 compounds
Author/Authors :
Choi، نويسنده , , Geun-Kyu and Kim، نويسنده , , Jeong-Ryeol and Yoon، نويسنده , , Sung Hun and Hong، نويسنده , , Kug Sun، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2007
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Abstract :
The microwave dielectric properties of scheelite (A = Ca, Sr, Ba) and wolframite (A = Mg, Mn, Zn) AMoO4 compounds and their relations with structure have been examined using a network analyzer and X-ray powder diffraction. The Mo ion polarizability has been also investigated from AMoO4 compounds using a least square refinement technique in conjunction with the Clausius–Mosotti equation. It was found that dielectric properties such as dielectric constant, temperature coefficient of resonant frequency, and quality factor were found to be correlated with the size of A-cations and the structure of compounds. The well sintered AMoO4 samples (>95% of theoretical density) exhibited dielectric constant of 7–11, quality factor of 37,000–90,000 GHz and temperature coefficient of resonant frequency of −57 to −87 ppm/°C, respectively. These investigations showed that AMoO4 ceramic could be selected as a possible candidate for microwave dielectric ceramics because of its low dielectric constant and high quality factor.
Keywords :
X-ray methods , polarizability , dielectric properties , Sintering
Journal title :
Journal of the European Ceramic Society
Journal title :
Journal of the European Ceramic Society
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