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.