Effects of Crystallization Behavior on Microwave Dielectric Properties of CaMgSi2O6Glass-Ceramics

Dependence of microwave dielectric properties on the crystallization behaviors of CaMgSi 2 O 6 (diopside) glass-ceramics was investigated with different heat treatment methods (one and/or two-step).The crystallization behaviors of the specimens, crystallite size and degree of crystallization, were evaluated by differential thermal analysis (DTA), scanning electron microscope (SEM) and X-ray diffraction (XRD) analysis by combined Rietveld and reference intensity ratio (RIR) methods.With an increase in heattreatment temperature, the dielectric constant (K) and the quality factor (Qf) increased due to the increase of the crystallite size and degree of crystallization.The specimens heat-treated by the two-step method had a higher degree of crystallization than the specimens heat-treated by the one-step method, which induced improvement in the quality factor (Qf) of the specimens.