熔体过冷度对透辉石晶体形貌、成分及过渡层性质的影响

Effects of Undercooling Degree on the Morphology,Composition and Transition Layer of the Diopside Crystal

在不同过冷度条件下,硅酸盐熔体结晶得到了透辉石晶体含量合适的样品。实验结果表明透辉石晶体形貌的自形程度随过冷度增加而降低。拉曼光谱分析显示晶体的特征谱峰半高宽随过冷度增加而变宽,拉曼光谱还显示出晶体结构继承玻璃结构的特征。运用电子探针详细分析了透辉石晶体及其生长界面附近成分变化的特点,发现存在约几到十几微米厚的过渡层,并且透辉石晶体成分随过冷度增大Al元素进入到晶体的含量也增加,同时Al元素与Mg元素在结晶过程中的协同作用较强。

The samples were prepared at different undercooling degrees,which diopsite crystallized in an appropriate content.The results show that the crystal integralities of dioposide decrease with the increase of undercooling degree.The studies of Raman spectroscopy show that the full width at half maximum(FWHM) of the character peaks increase with the increase of undercooling degree.By comparing the crystal and glass spectra,it is found that the crystal has inherited some features from silicate melt.From the elect...