中文摘要：

通过偏光显微镜（PL）、扫描电镜（SEM）对Li[AlSiO4]-SiO2体系进行枝晶形貌、枝体结晶学方向测试及结晶能力方面的观察发现：十字状枝晶为四方晶系的凯石英固溶体,六枝雪花状枝晶为六方晶系的β-石英固溶体。电子背散射衍射（EBSD）测试确定凯石英固溶体是沿〈001〉和〈100〉或〈110〉方向发育成枝晶的主干。对比Li[AlSiO4]-SiO2体系与K[AlSi3O8]-SiO2体系,证实两个体系的结晶能力不同,其中Li[AlSiO4]-SiO2体系的晶体含量远远多于K[AlSi3O8]-SiO2体系的晶体含量,枝晶的枝体也比K[AlSi3O8]-SiO2体系的枝晶粗,因此,Li离子比K离子更容易使架状硅酸盐熔体结晶。

英文摘要：

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.Electron backscattered diffraction（EBSD） technique is used to determine the crystallographic orientation of dendrite of keatite solid solution.It reveals that the main branches of keatite solid solution dendrite develop along the 001 and 100 or 110.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.