tevis
第7楼2012/05/03
I am not convinced those are stair-rod dislocations. The HREM you posted isn't that informative.
Did you see ZnS/NaCl phases?
[quote]原文由 perpetualcat68(perpetualcat68) 发表:MBE制备方估计是少量MgS析出时发生了相变,从'ZnS'结构转换到'NaCl'结构.HRTEM上的'stair rods'很明确,但其根源并不在电镜像上,得顺着两个rods延伸找下去.后来他们加以改进,降低了MgS的比例,并在GaAs-substrate上先增长一层ZnSe,以降低strain.改进后的样品从明,暗场,HRTEM上看好多了.