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J. Korean Ceram. Soc. > Volume 45(5); 2008 > Article
Journal of the Korean Ceramic Society 2008;45(5): 251.
doi: https://doi.org/10.4191/kcers.2008.45.5.251
Effects of Crystal Structure on Microwave Dielectric Properties of Ceramics
Eung Soo Kim, Chang-Jun Jeon, Sung-Joo Kim, Su-Jung Kim
Department of Materials Engineering, Kyonggi University
Microwave dielectric properties of $MgTiO_3,;MgWO_4,;MgNb_2O_6$, and $MgTa_2O_6$ were investigated based on the structural characteristics. The dielectric constant (K) was dependent on the dielectric polarizabilities of the specimens, and the deviation of the observed dielectric polarizabilities (${alpha}_{obs.}$) from the theoretical dielectric polarizabilities (${alpha}_{theo.}$) were decreased with increasing of Mg-site bond valence. Quality factors (Qf) were affected by the sharing type of $MgO_6$ and $BO_6$ octahedra. Temperature coefficient of resonant frequency (TCF) was decreased with increasing of average octahedral distortion.
Key words: Microwave dielectric properties, Octahedral distortion, Dielectric polarizabilities, Bond valence
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