Addition of different amount of zirconia (ZrO 2 ) nucleating agent into MgO-CaO-SiO 2 system to enhance the quality factor (Q × f) of CaMgSi 2 O 6 diopside glass-ceramic for low sintering temperature process (from 850 to 950 °C) was carried out in this work. The microstructures, microwave dielectric properties and nucleating/growth mechanism of m-ZrO 2 added CaMgSi 2 O 6 system were analyzed using transmission electron microscopy (TEM) and electrical property measurements. Experimental results demonstrate that a solid solution of an amorphous phase MgO-CaO-SiO 2 and ZrO 2 forms after melted at 1500 °C. The t-ZrO 2 appears in the amorphous matrix first and then crystalline CaMgSi 2 O 6 particle grows up at around the boundary of t-ZrO 2 after thermal treatment at 850 °C due to heterogeneous nucleating. Formation of t-ZrO 2 is attributed to diffusion of Ca 2+ to stabilize the m-ZrO 2 . The quality factor of CaMgSi 2 O 6 was significantly enhanced by adding 3 wt.% m-ZrO 2 , indicating that the ZrO 2 nucleating agent could enhance crystallization and therefore increase the quality factor.
|頁（從 - 到）||2851-2855|
|期刊||Materials Research Bulletin|
|出版狀態||Published - 1 十月 2012|