Di-Ab-An、Q-Lc体系非平衡结晶及枝晶结晶学方向测试研究  

Non-equilibrium Crystallization and Determination of Crystallographic Orientation of Dendrites in Di-Ab-An and Q-Lc Systems

作　　者：杨明玲[1] 赵珊茸[1] 徐海军[2] 郭颖[3] 

机构地区：[1]中国地质大学地球科学学院,武汉430074 [2]中国地质大学地质过程与矿产资源国家重点实验室,武汉430074 [3]中国科学院等离子物理研究所,合肥230031

出　　处：《人工晶体学报》2008年第2期268-275,共8页Journal of Synthetic Crystals

基　　金：国家自然科学基金资助项目(No.40472023)

摘　　要：本文对两个典型的硅酸盐体系:Di(透辉石)-Ab(钠长石)-An(钙长石)体系和Q(石英)-Lc(白榴石)体中结晶物相系进行了枝状形貌、枝体结晶学方向测试及结晶能力方面的研究。通过偏光显微镜(PL)、扫描电镜(SEM)观察发现:透辉石、低鳞石英、α-方石英都发育为枝晶,而斜长石发育成放射状球粒晶和针状晶体。通过电子背散射衍射(EBSD)测试确定出透辉石是沿<001>方向发育成枝晶的主干、低鳞石英是沿<100>和<010>方向发育成枝晶主干、α-方石英是沿两个<100>方向发育成枝晶的主干。并发现两个体系在相同降温速度下的结晶能力不同。The paper focused on two classical silicate systems： Di-Ab-An （Diopside-Albite-Anorthite） system and Q-Lc （Quartz-Leucite） system. We have studied the ramiform morphology, the crystallographic orientation of dendrite and the crystallization capacity. Based on the observation of PL （polar light microscopy） and SEM （scan electron microscopy） methods, it shows that diopside, low tridymite and α-cristobalite develop to dendrite, but plagioclase develops to spherulite and acicula. We used the EBSD（ electron backscatter diffraction） technique to determine the crystallographic orientation of . diopside dendrite,low tridymite dendrite and α-cristobalite dendrite. The result is that the main branches of diopside dendrite develop along the 〈 001 〉, and that of the low tridymite dendrite develop along the 〈 100 〉 and 〈 010 〉, and that of the α-cristobalite dendrite develop along the two 〈 100 〉. We found that crystallization capacity is diferent-between these two systems under the same cooling-rate.

关 键 词：硅酸盐 枝状形貌 EBSD 结晶学方向 

分 类 号：O79[理学—晶体学]