Imperfections in the crystal structure of Cd1−xMnxTe

We have made x-ray diffraction and etching studies of Cd1−xMnxTe samples with x≥0.05, and optical transmission studies when x≥0.45. We found that samples with x=0.05 and x=0.57 were zinc-blende-structured monocrystals, but that those with x=0.20 and 0.35 lacked four-fold symmetry and were heavily twinned. Those with 0.45 and 0.65 showed 6-mm symmetry which is most likely due to multiple twinning, but could be due to the presence of hexagonal crystallites with a c/a ratio of (6)1/2.