| 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 |
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| ABSTRACT |
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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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