Sm2NiGe3 is hexagonal omega structure-derived structured and crystallizes in the orthorhombic Pmm2 space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to two equivalent Ni(1), two equivalent Ge(3), four equivalent Ge(1), and four equivalent Ge(2) atoms to form SmNi2Ge10 cuboctahedra that share edges with four equivalent Sm(1)Ni2Ge10 cuboctahedra, edges with eight equivalent Sm(2)Ni4Ge8 cuboctahedra, faces with four equivalent Sm(1)Ni2Ge10 cuboctahedra, and faces with four equivalent Sm(2)Ni4Ge8 cuboctahedra. In the second Sm site, Sm(2) is bonded to four equivalent Ni(1), two equivalent Ge(1), two equivalent Ge(2), and four equivalent Ge(3) atoms to form SmNi4Ge8 cuboctahedra that share edges with four equivalent Sm(2)Ni4Ge8 cuboctahedra, edges with eight equivalent Sm(1)Ni2Ge10 cuboctahedra, faces with four equivalent Sm(1)Ni2Ge10 cuboctahedra, and faces with four equivalent Sm(2)Ni4Ge8 cuboctahedra. Ni(1) is bonded in a 9-coordinate geometry to two equivalent Sm(1), four equivalent Sm(2), one Ge(3), and two equivalent Ge(2) atoms. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to two equivalent Sm(2), four equivalent Sm(1), one Ge(2), and two equivalent Ge(3) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to two equivalent Sm(2), four equivalent Sm(1), two equivalent Ni(1), and one Ge(1) atom. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to two equivalent Sm(1), four equivalent Sm(2), one Ni(1), and two equivalent Ge(1) atoms.
Sm2NiGe3 is hexagonal omega structure-derived structured and crystallizes in the orthorhombic Pmm2 space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to two equivalent Ni(1), two equivalent Ge(3), four equivalent Ge(1), and four equivalent Ge(2) atoms to form SmNi2Ge10 cuboctahedra that share edges with four equivalent Sm(1)Ni2Ge10 cuboctahedra, edges with eight equivalent Sm(2)Ni4Ge8 cuboctahedra, faces with four equivalent Sm(1)Ni2Ge10 cuboctahedra, and faces with four equivalent Sm(2)Ni4Ge8 cuboctahedra. Both Sm(1)-Ni(1) bond lengths are 3.09 Å. Both Sm(1)-Ge(3) bond lengths are 3.30 Å. All Sm(1)-Ge(1) bond lengths are 3.19 Å. All Sm(1)-Ge(2) bond lengths are 3.25 Å. In the second Sm site, Sm(2) is bonded to four equivalent Ni(1), two equivalent Ge(1), two equivalent Ge(2), and four equivalent Ge(3) atoms to form SmNi4Ge8 cuboctahedra that share edges with four equivalent Sm(2)Ni4Ge8 cuboctahedra, edges with eight equivalent Sm(1)Ni2Ge10 cuboctahedra, faces with four equivalent Sm(1)Ni2Ge10 cuboctahedra, and faces with four equivalent Sm(2)Ni4Ge8 cuboctahedra. All Sm(2)-Ni(1) bond lengths are 3.22 Å. Both Sm(2)-Ge(1) bond lengths are 3.20 Å. Both Sm(2)-Ge(2) bond lengths are 3.03 Å. All Sm(2)-Ge(3) bond lengths are 3.15 Å. Ni(1) is bonded in a 9-coordinate geometry to two equivalent Sm(1), four equivalent Sm(2), one Ge(3), and two equivalent Ge(2) atoms. The Ni(1)-Ge(3) bond length is 2.30 Å. Both Ni(1)-Ge(2) bond lengths are 2.32 Å. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to two equivalent Sm(2), four equivalent Sm(1), one Ge(2), and two equivalent Ge(3) atoms. The Ge(1)-Ge(2) bond length is 2.51 Å. Both Ge(1)-Ge(3) bond lengths are 2.52 Å. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to two equivalent Sm(2), four equivalent Sm(1), two equivalent Ni(1), and one Ge(1) atom. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to two equivalent Sm(1), four equivalent Sm(2), one Ni(1), and two equivalent Ge(1) atoms.