SmY(MnGe)4 crystallizes in the tetragonal P4/mmm space group. Sm(1) is bonded in a 8-coordinate geometry to eight equivalent Ge(1) atoms. Y(1) is bonded in a 8-coordinate geometry to eight equivalent Ge(2) atoms. Mn(1) is bonded to two equivalent Ge(1) and two equivalent Ge(2) atoms to form a mixture of corner and edge-sharing MnGe4 tetrahedra. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to four equivalent Sm(1), four equivalent Mn(1), and one Ge(1) atom. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to four equivalent Y(1), four equivalent Mn(1), and one Ge(2) atom.
SmY(MnGe)4 crystallizes in the tetragonal P4/mmm space group. Sm(1) is bonded in a 8-coordinate geometry to eight equivalent Ge(1) atoms. All Sm(1)-Ge(1) bond lengths are 3.10 Å. Y(1) is bonded in a 8-coordinate geometry to eight equivalent Ge(2) atoms. All Y(1)-Ge(2) bond lengths are 3.09 Å. Mn(1) is bonded to two equivalent Ge(1) and two equivalent Ge(2) atoms to form a mixture of corner and edge-sharing MnGe4 tetrahedra. Both Mn(1)-Ge(1) bond lengths are 2.43 Å. Both Mn(1)-Ge(2) bond lengths are 2.43 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to four equivalent Sm(1), four equivalent Mn(1), and one Ge(1) atom. The Ge(1)-Ge(1) bond length is 2.65 Å. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to four equivalent Y(1), four equivalent Mn(1), and one Ge(2) atom. The Ge(2)-Ge(2) bond length is 2.61 Å.