MgGe3 is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. Mg(1) is bonded to four equivalent Ge(1) and eight equivalent Ge(2) atoms to form MgGe12 cuboctahedra that share corners with four equivalent Mg(1)Ge12 cuboctahedra, edges with eight equivalent Mg(1)Ge12 cuboctahedra, edges with sixteen equivalent Ge(2)Mg4Ge8 cuboctahedra, faces with four equivalent Mg(1)Ge12 cuboctahedra, and faces with eight equivalent Ge(2)Mg4Ge8 cuboctahedra. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a square co-planar geometry to four equivalent Mg(1) and eight equivalent Ge(2) atoms. In the second Ge site, Ge(2) is bonded to four equivalent Mg(1), four equivalent Ge(1), and four equivalent Ge(2) atoms to form distorted GeMg4Ge8 cuboctahedra that share corners with twelve equivalent Ge(2)Mg4Ge8 cuboctahedra, edges with eight equivalent Mg(1)Ge12 cuboctahedra, edges with eight equivalent Ge(2)Mg4Ge8 cuboctahedra, faces with four equivalent Mg(1)Ge12 cuboctahedra, and faces with ten equivalent Ge(2)Mg4Ge8 cuboctahedra.
MgGe3 is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. Mg(1) is bonded to four equivalent Ge(1) and eight equivalent Ge(2) atoms to form MgGe12 cuboctahedra that share corners with four equivalent Mg(1)Ge12 cuboctahedra, edges with eight equivalent Mg(1)Ge12 cuboctahedra, edges with sixteen equivalent Ge(2)Mg4Ge8 cuboctahedra, faces with four equivalent Mg(1)Ge12 cuboctahedra, and faces with eight equivalent Ge(2)Mg4Ge8 cuboctahedra. All Mg(1)-Ge(1) bond lengths are 2.96 Å. All Mg(1)-Ge(2) bond lengths are 3.06 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a square co-planar geometry to four equivalent Mg(1) and eight equivalent Ge(2) atoms. All Ge(1)-Ge(2) bond lengths are 3.06 Å. In the second Ge site, Ge(2) is bonded to four equivalent Mg(1), four equivalent Ge(1), and four equivalent Ge(2) atoms to form distorted GeMg4Ge8 cuboctahedra that share corners with twelve equivalent Ge(2)Mg4Ge8 cuboctahedra, edges with eight equivalent Mg(1)Ge12 cuboctahedra, edges with eight equivalent Ge(2)Mg4Ge8 cuboctahedra, faces with four equivalent Mg(1)Ge12 cuboctahedra, and faces with ten equivalent Ge(2)Mg4Ge8 cuboctahedra. All Ge(2)-Ge(2) bond lengths are 2.96 Å.