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J. Korean Ceram. Soc. > Volume 47(2); 2010 > Article
Journal of the Korean Ceramic Society 2010;47(2): 163.
doi: https://doi.org/10.4191/kcers.2010.47.2.163
Evaluation of Microwave Dielectric Properties of MgO-TiO2 System by Dielectric Mixing Rules
Eung Soo Kim, Seock-No Seo
Department of Materials Engineering, Kyonggi University
ABSTRACT
Effects of compositions on the microwave dielectric properties of the MgO-$TiO_2$ system were investigated as a function of the molar ratio of MgO to $TiO_2$ ($0.9{leq}MgO/TiO_2;(x){leq}1.2$). With the compositional changes, secondary phases of $MgTi_2O_5$ and $Mg_2TiO_4$ were also detected along with $MgTiO_3$. Microwave dielectric properties of the specimens were dependent on the types of phases developed in the sintered specimens. A single phase of $MgTiO_3$ showed a dielectric constant (K) of 18.2, a quality factor (Qf) of 198,000 GHz, and a temperature coefficient of resonant frequency (TCF) of $-51;ppm/^{circ}C$. However, the dielectric properties of the specimens with a secondary phase of $MgTi_2O_5$ (K=19.9, Qf=48,000 GHz) and/or $Mg_2TiO_4$ (K=15.6, Qf=56,000 GHz) were worsened. Dependence of the microwave dielectric properties on the secondary phase of the MgO-$TiO_2$ system was also discussed in terms of dielectric mixing rules.
Key words: MgO-$TiO_2$, Microwave dielectric properties, Mixing rules, Rietveld refinement
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