人工生长白宝石单晶结构的TEM衍射测定

Determination of Crystal Structure of Sapphire Single Crystal Grown by EFG Method by TEM Selected Area Diffraction

用透射电镜选区电子衍射（ＴＥＭ）方法测试了导模法生长的白宝石单晶体的晶体结构和点阵常数。测试结果表明，人工生长的白宝石单晶为六方结构，点阵常数ａ＝０．４７６ｎｍ，ｃ＝１．３０１ｎｍ，晶胞常数比ｃ／ａ＝２．７３５。

The crystal structure and its lattice parameter of sapphire single crystal grown by EFG method was determined by selected area diffraction of transmission electron micrograph (TEM). It was found that the crystal structure of sapphire single crystal grown by EFG method is hexagonal system with a =0.476nm, c =1.301nm and its c/a =2.735。