Enhanced Crystallization Behaviour and Microwave Dielectric Properties of 0.9CaMgSi2O6-0.1MgSiO3 Glass-Ceramics Doped with TiO2

Jo, Hyun Jin;Sun, Gui Nam;Kim, Eung Soo

  • Received : 2016.02.01
  • Accepted : 2016.02.19
  • Published : 2016.03.31


The dependence of the microwave dielectric properties of the glass-ceramic composite $0.9CaMgSi_2O_6-0.1MgSiO_3$ on the crystallization behaviour was investigated as functions of the $TiO_2$ content and heat-treatment temperature. The crystallization behaviour of the specimens was evaluated via a combination of the Rietveld and reference-intensity ratio methods. For specimens with a $TiO_2$ content of up to 1 wt.%, a monoclinic diopside phase was formed, whereas a secondary $TiO_2$ phase was formed with further increases in the $TiO_2$ content. The quality factor (Qf) of the specimens was strongly dependent on the degree of crystallization. The highest Qf value was obtained with a $TiO_2$ content of 0.5 wt.%, which was improved by increasing the heat-treatment temperature. The dielectric constant (K) was affected by the size of the crystallites and the $TiO_2$ content. The temperature coefficient of the resonant frequency (TCF) was nearly constant for all of the specimens, regardless of the $TiO_2$ content or heattreatment temperature.


Glass-ceramics;Diopside;Enstatite;Microwave dielectric properties;Degree of crystallization


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