红宝石晶体光学浮区法生长及其缺陷研究

Floating Zone Growth and Defect Study on Ruby Single Crystals

采用光学浮区法生长了Φ7 mm×70 mm的红宝石晶体。晶体的生长界面为凸界面,生长方向为<001>方向。X射线双晶摇摆曲线表明晶体具有良好的质量。研究了生长温度、旋转速率、生长速率对晶体质量的影响,确定了合理的工艺条件。通过扫描电镜、能量散射光谱仪、X射线衍射、化学腐蚀结合偏光显微镜对红宝石晶体中气泡、位错、胞状组织和溶质尾迹等缺陷进行了分析。

Ruby single crystals with a diameter of 7 mm and a length of 70 mm were successfully produced by the floating zone technique.The solid-liquid interface is convex to the melt,and growth direction was determined as 001.The X-ray rocking curve of the crystal has a FWMH of 0.089°,proving the excellent quality of the crystal.The as-grown crystals were characterized by polarized optical microscopy,X-ray diffraction,chemical etch,scanning electron microscopy,as well as energy dispersive spectroscopy.The primary crystal defects observed were bubbles,dislocations,cellular Structure and solute trails.The relationship between crystal quality and growth condition was also discussed,and the optimum method was obtained.