Li8Sm7Ge10 crystallizes in the orthorhombic Cmmm space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one Sm(1), two equivalent Sm(3), one Ge(2), one Ge(4), and two equivalent Ge(3) atoms to form distorted LiSm3Ge4 tetrahedra that share corners with five equivalent Li(1)Sm3Ge4 tetrahedra, edges with two equivalent Sm(4)Ge6 octahedra, edges with two equivalent Li(1)Sm3Ge4 tetrahedra, edges with four equivalent Li(2)Sm3Ge4 tetrahedra, faces with two equivalent Li(1)Sm3Ge4 tetrahedra, and faces with two equivalent Li(2)Sm3Ge4 tetrahedra. In the second Li site, Li(2) is bonded to one Sm(3), two equivalent Sm(1), one Ge(1), one Ge(3), and two equivalent Ge(2) atoms to form distorted LiSm3Ge4 tetrahedra that share  a cornercorner with one Sm(4)Ge6 octahedra, corners with four equivalent Li(2)Sm3Ge4 tetrahedra, edges with two equivalent Li(2)Sm3Ge4 tetrahedra, edges with four equivalent Li(1)Sm3Ge4 tetrahedra, faces with two equivalent Li(1)Sm3Ge4 tetrahedra, and faces with two equivalent Li(2)Sm3Ge4 tetrahedra. The corner-sharing octahedral tilt angles are 52°. There are four inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 12-coordinate geometry to two equivalent Li(1), four equivalent Li(2), two equivalent Ge(3), and four equivalent Ge(1) atoms. In the second Sm site, Sm(2) is bonded in a 9-coordinate geometry to one Ge(2) and eight equivalent Ge(1) atoms. In the third Sm site, Sm(3) is bonded in a 12-coordinate geometry to two equivalent Li(2), four equivalent Li(1), two equivalent Ge(2), and four equivalent Ge(4) atoms. In the fourth Sm site, Sm(4) is bonded to two equivalent Ge(3) and four equivalent Ge(4) atoms to form SmGe6 octahedra that share corners with four equivalent Li(2)Sm3Ge4 tetrahedra, edges with two equivalent Sm(4)Ge6 octahedra, and edges with eight equivalent Li(1)Sm3Ge4 tetrahedra. There are four inequivalent Ge sites. In the first Ge site, Ge(2) is bonded in a 6-coordinate geometry to two equivalent Li(1), four equivalent Li(2), one Sm(2), and two equivalent Sm(3) atoms. In the second Ge site, Ge(3) is bonded in a 9-coordinate geometry to two equivalent Li(2), four equivalent Li(1), one Sm(4), and two equivalent Sm(1) atoms. In the third Ge site, Ge(4) is bonded in a 9-coordinate geometry to two equivalent Li(1), two equivalent Sm(4), four equivalent Sm(3), and one Ge(4) atom. In the fourth Ge site, Ge(1) is bonded in a 9-coordinate geometry to one Li(2), two equivalent Sm(1), four equivalent Sm(2), and two equivalent Ge(1) atoms.
Li8Sm7Ge10 crystallizes in the orthorhombic Cmmm space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one Sm(1), two equivalent Sm(3), one Ge(2), one Ge(4), and two equivalent Ge(3) atoms to form distorted LiSm3Ge4 tetrahedra that share corners with five equivalent Li(1)Sm3Ge4 tetrahedra, edges with two equivalent Sm(4)Ge6 octahedra, edges with two equivalent Li(1)Sm3Ge4 tetrahedra, edges with four equivalent Li(2)Sm3Ge4 tetrahedra, faces with two equivalent Li(1)Sm3Ge4 tetrahedra, and faces with two equivalent Li(2)Sm3Ge4 tetrahedra. The Li(1)-Sm(1) bond length is 3.18 Å. Both Li(1)-Sm(3) bond lengths are 3.11 Å. The Li(1)-Ge(2) bond length is 2.71 Å. The Li(1)-Ge(4) bond length is 2.62 Å. Both Li(1)-Ge(3) bond lengths are 2.64 Å. In the second Li site, Li(2) is bonded to one Sm(3), two equivalent Sm(1), one Ge(1), one Ge(3), and two equivalent Ge(2) atoms to form distorted LiSm3Ge4 tetrahedra that share  a cornercorner with one Sm(4)Ge6 octahedra, corners with four equivalent Li(2)Sm3Ge4 tetrahedra, edges with two equivalent Li(2)Sm3Ge4 tetrahedra, edges with four equivalent Li(1)Sm3Ge4 tetrahedra, faces with two equivalent Li(1)Sm3Ge4 tetrahedra, and faces with two equivalent Li(2)Sm3Ge4 tetrahedra. The corner-sharing octahedral tilt angles are 52°. The Li(2)-Sm(3) bond length is 3.16 Å. Both Li(2)-Sm(1) bond lengths are 3.13 Å. The Li(2)-Ge(1) bond length is 2.53 Å. The Li(2)-Ge(3) bond length is 2.68 Å. Both Li(2)-Ge(2) bond lengths are 2.62 Å. There are four inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 12-coordinate geometry to two equivalent Li(1), four equivalent Li(2), two equivalent Ge(3), and four equivalent Ge(1) atoms. Both Sm(1)-Ge(3) bond lengths are 3.18 Å. All Sm(1)-Ge(1) bond lengths are 3.09 Å. In the second Sm site, Sm(2) is bonded in a 9-coordinate geometry to one Ge(2) and eight equivalent Ge(1) atoms. The Sm(2)-Ge(2) bond length is 3.15 Å. There are four shorter (3.08 Å) and four longer (3.33 Å) Sm(2)-Ge(1) bond lengths. In the third Sm site, Sm(3) is bonded in a 12-coordinate geometry to two equivalent Li(2), four equivalent Li(1), two equivalent Ge(2), and four equivalent Ge(4) atoms. Both Sm(3)-Ge(2) bond lengths are 3.21 Å. All Sm(3)-Ge(4) bond lengths are 3.17 Å. In the fourth Sm site, Sm(4) is bonded to two equivalent Ge(3) and four equivalent Ge(4) atoms to form SmGe6 octahedra that share corners with four equivalent Li(2)Sm3Ge4 tetrahedra, edges with two equivalent Sm(4)Ge6 octahedra, and edges with eight equivalent Li(1)Sm3Ge4 tetrahedra. Both Sm(4)-Ge(3) bond lengths are 3.12 Å. All Sm(4)-Ge(4) bond lengths are 3.06 Å. There are four inequivalent Ge sites. In the first Ge site, Ge(2) is bonded in a 6-coordinate geometry to two equivalent Li(1), four equivalent Li(2), one Sm(2), and two equivalent Sm(3) atoms. In the second Ge site, Ge(3) is bonded in a 9-coordinate geometry to two equivalent Li(2), four equivalent Li(1), one Sm(4), and two equivalent Sm(1) atoms. In the third Ge site, Ge(4) is bonded in a 9-coordinate geometry to two equivalent Li(1), two equivalent Sm(4), four equivalent Sm(3), and one Ge(4) atom. The Ge(4)-Ge(4) bond length is 2.56 Å. In the fourth Ge site, Ge(1) is bonded in a 9-coordinate geometry to one Li(2), two equivalent Sm(1), four equivalent Sm(2), and two equivalent Ge(1) atoms. There is one shorter (2.49 Å) and one longer (2.53 Å) Ge(1)-Ge(1) bond length.