Crystal structure of the ScMGe compounds where M=Mn,Fe,Co,Ni,Cu

Results are presented of the X-ray diffraction study of the crystal structure of ScMGe germanides, where M=Mn, Fe, Co, Ni, Cu. The unit cell parameters and interplanar distances are determined. The existence of the ScCuGe compound with the ZrNiAl type structure in the Sc-Cu-Ge system has been proved. The ternary ScFeGe and ScMnGe compounds also have the ZrNiAl type structure. The ScFeGe structure is clarified from 40 possible reflections of diffractogram and it has divergence factor equal to R=0.127. The atom coordinates are determined. The ScNiGe and ScCoGe compounds have the TiNiSi type structure. For ScNiGe R equals 0.139 (from 92 reflections). The morphotropy of ScMSi and ScMGe compounds has been investigated.