星光宝石中星线和沉积物的关系

On the Relation Between the Asterism and the Precipitates of Star Sapphire

星光宝石中的星线是由于在宝石基平面中存在着互成60°的针状沉淀物。研究了含钛刚玉宝石在1100—1450℃范围内的析品行为;测量了针状晶体的尺寸随星化时间的变化。用扫描电镜研究了沉淀物的组成,沉淀物是含钛、铝的固溶体。

The asterism of star sapphire are due to the existence ofthree groups of mutrually intercrossed(60°)needle-like particles in the surfa-ce of sapphire.We have studied the crystallizing behavior of the titanium-doped sapphire in the temperature range 1100℃-1450℃,measured the dimen-tional variations of the needle-like particles with the duration of heat treat-ment,and analysed the component of the precipitation by SEM.It is confir-med that the precipitation is a kind of solid solution containing titanium andaluminium.