Sm2AlGe3 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 11-coordinate geometry to two equivalent Al(1), one Ge(1), four equivalent Ge(2), and four equivalent Ge(3) atoms. In the second Sm site, Sm(2) is bonded in a 10-coordinate geometry to three equivalent Al(1), two equivalent Ge(2), two equivalent Ge(3), and three equivalent Ge(1) atoms. Al(1) is bonded to two equivalent Sm(1), three equivalent Sm(2), one Ge(3), and three equivalent Ge(1) atoms to form distorted face-sharing AlSm5Ge4 tetrahedra. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 7-coordinate geometry to one Sm(1), three equivalent Sm(2), and three equivalent Al(1) atoms. In the second Ge site, Ge(2) is bonded in a 8-coordinate geometry to two equivalent Sm(2), four equivalent Sm(1), and two equivalent Ge(3) atoms. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to two equivalent Sm(2), four equivalent Sm(1), one Al(1), and two equivalent Ge(2) atoms.
Sm2AlGe3 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 11-coordinate geometry to two equivalent Al(1), one Ge(1), four equivalent Ge(2), and four equivalent Ge(3) atoms. Both Sm(1)-Al(1) bond lengths are 3.43 Å. The Sm(1)-Ge(1) bond length is 3.09 Å. There are two shorter (3.04 Å) and two longer (3.35 Å) Sm(1)-Ge(2) bond lengths. There are two shorter (3.07 Å) and two longer (3.17 Å) Sm(1)-Ge(3) bond lengths. In the second Sm site, Sm(2) is bonded in a 10-coordinate geometry to three equivalent Al(1), two equivalent Ge(2), two equivalent Ge(3), and three equivalent Ge(1) atoms. There is one shorter (3.30 Å) and two longer (3.39 Å) Sm(2)-Al(1) bond lengths. Both Sm(2)-Ge(2) bond lengths are 3.03 Å. Both Sm(2)-Ge(3) bond lengths are 3.13 Å. There is one shorter (3.09 Å) and two longer (3.11 Å) Sm(2)-Ge(1) bond lengths. Al(1) is bonded to two equivalent Sm(1), three equivalent Sm(2), one Ge(3), and three equivalent Ge(1) atoms to form distorted face-sharing AlSm5Ge4 tetrahedra. The Al(1)-Ge(3) bond length is 2.59 Å. There are two shorter (2.58 Å) and one longer (2.69 Å) Al(1)-Ge(1) bond length. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 7-coordinate geometry to one Sm(1), three equivalent Sm(2), and three equivalent Al(1) atoms. In the second Ge site, Ge(2) is bonded in a 8-coordinate geometry to two equivalent Sm(2), four equivalent Sm(1), and two equivalent Ge(3) atoms. There is one shorter (2.59 Å) and one longer (2.64 Å) Ge(2)-Ge(3) bond length. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to two equivalent Sm(2), four equivalent Sm(1), one Al(1), and two equivalent Ge(2) atoms.