Determination of Dendrite Morphology and Its Crystallographic Orientation in Li[AlSiO4]-SiO2 Systems
The dendrite morphology, the crystallographic orientation of dendrite and the crystallization capacity of Li[AlSiO4]-SiO2 system are studied on the basis of observation of polar light microscopy( PL)and scanning electron microscopy (SEM). It is shown that cross-shaped dendrite belongs to keatite solid solution and the snow-shaped dendrite belongs to β-quartz solid solution. In comparison of Li[AlSiO4]-SiO2 system with K[AlSi3O8]-SiO2 system, it is found that crystallization capacity is different between these two systems. The crystalline content of Li[AlSiO4]-SiO2 system is bigger than that of the K[AlSi3O8]-SiO2 system, and the dendrite branch is also thicker. Therefore, Li-ion is more effective than K-ion in the crystallization of framework silicate melt.