钆钪铝石榴石单晶缺陷的微观形貌与成因研究

Morphologies and Formation Mechanisms of the Defects in Gadolinium-Scandium-Aluminum Garnet Single Crystal

采用提拉法生长了2%Dy^(3+)和1%Tb^(3+)(原子数分数)共掺的钆钪铝石榴石激光晶体(Gd_(3)Sc_(2)Al_(3)O_(12),GSAG)。研究了晶体(111)晶面的腐蚀缺陷形貌并对缺陷形成机理进行了解释,讨论了晶体缺陷的特征形貌与晶体结构之间的关系。表征并计算了晶体(111)晶面的维氏硬度和莫氏硬度,在0.2 kgf载荷和10 s保荷时间条件下,晶体(111)面的维氏硬度为1267 kg/mm^(2),对应的莫氏硬度为7.3。研究结果对揭示混晶石榴石晶体中缺陷的成因和探索高品质晶体生长与加工工艺具有一定的参考价值。

A gadolinium-scandium-aluminum garnet single crystal(Gd_(3)Sc_(2)Al_(3)O_(12),GSAG)co-doped with 2%Dy^(3+) and 1%Tb^(3+)(atomic number fraction)was grown by Czochralski method.The morphology of etched defect on the crystal surface of(111)plane was studied and the mechanism for the formation of the defects was discussed.Besides,the Vickers hardness and Mohs hardness of the(111)plane were also characterized and calculated.On the condition of 0.2 kgf loading and 10 s keeping time,the Vickers hardness for the(111)plane is 1267 kg/mm^(2),corresponding to the Mohs hardness of 7.3.The results have reference value for revealing the origin of defects in mixed garnet crystals and exploring the growth technics for high quality crystals.