Thorium Transition Metals Ternary Germanides

New ternary germanides of the general compo sition ThM2Ge2 were found to exist in the systems Th-Cr-Ge, Th-Mn-Ge, Th-Fe -Ge, Th-Co- Ge, Th-Ni- Ge and Th- Cu-Ge. The crystal structure analysis by means of the x - ray powder diffraction method showed that these compounds are isostructural with the compounds ThM2Si2 (M = Cr, Mn, Fe, Co, Ni and Cu), discdvered in this labo.ratory,, The tetragonal unit cell contains two formula units. Space group is !4/mmm. The atomic positions of thorium and the transition metal are defined by special position 2(a) and 4(d), respectively, while the variabl e 2arameter z determining the position 4(e) of the germanium atoms was obtained by computing the ele ctroi;i. density distribution along the c-axis