CsSm2Ti2NbO10 crystallizes in the monoclinic Cm space group. Cs(1) is bonded in a body-centered cubic geometry to four equivalent O(5) and four equivalent O(6) atoms. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 10-coordinate geometry to two equivalent O(7), four equivalent O(1), and four equivalent O(3) atoms. In the second Sm site, Sm(2) is bonded to four equivalent O(2), four equivalent O(4), and four equivalent O(7) atoms to form distorted SmO12 cuboctahedra that share corners with four equivalent Sm(2)O12 cuboctahedra, faces with four equivalent Sm(2)O12 cuboctahedra, and faces with four equivalent Ti(1)O6 octahedra. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(3), one O(4), and four equivalent O(7) atoms to form TiO6 octahedra that share corners with four equivalent Ti(1)O6 octahedra and faces with four equivalent Sm(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 14°. In the second Ti site, Ti(2) is bonded in a 5-coordinate geometry to one O(5) and four equivalent O(1) atoms. Nb(1) is bonded in a 6-coordinate geometry to one O(4), one O(6), and four equivalent O(2) atoms. There are seven inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sm(1) and two equivalent Ti(2) atoms to form a mixture of distorted corner and edge-sharing OSm2Ti2 tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Sm(2) and two equivalent Nb(1) atoms. In the third O site, O(3) is bonded in a distorted single-bond geometry to four equivalent Sm(1) and one Ti(1) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to four equivalent Sm(2), one Ti(1), and one Nb(1) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to four equivalent Cs(1) and one Ti(2) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to four equivalent Cs(1) and one Nb(1) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one Sm(1), two equivalent Sm(2), and two equivalent Ti(1) atoms.
CsSm2Ti2NbO10 crystallizes in the monoclinic Cm space group. Cs(1) is bonded in a body-centered cubic geometry to four equivalent O(5) and four equivalent O(6) atoms. There are a spread of Cs(1)-O(5) bond distances ranging from 3.11-3.17 Å. There are a spread of Cs(1)-O(6) bond distances ranging from 3.26-3.34 Å. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 10-coordinate geometry to two equivalent O(7), four equivalent O(1), and four equivalent O(3) atoms. Both Sm(1)-O(7) bond lengths are 3.05 Å. There are two shorter (2.36 Å) and two longer (2.43 Å) Sm(1)-O(1) bond lengths. There are a spread of Sm(1)-O(3) bond distances ranging from 2.58-3.02 Å. In the second Sm site, Sm(2) is bonded to four equivalent O(2), four equivalent O(4), and four equivalent O(7) atoms to form distorted SmO12 cuboctahedra that share corners with four equivalent Sm(2)O12 cuboctahedra, faces with four equivalent Sm(2)O12 cuboctahedra, and faces with four equivalent Ti(1)O6 octahedra. There are two shorter (2.54 Å) and two longer (2.80 Å) Sm(2)-O(2) bond lengths. There are a spread of Sm(2)-O(4) bond distances ranging from 2.41-3.08 Å. There are two shorter (2.46 Å) and two longer (2.93 Å) Sm(2)-O(7) bond lengths. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(3), one O(4), and four equivalent O(7) atoms to form TiO6 octahedra that share corners with four equivalent Ti(1)O6 octahedra and faces with four equivalent Sm(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 14°. The Ti(1)-O(3) bond length is 1.87 Å. The Ti(1)-O(4) bond length is 2.02 Å. There are two shorter (1.88 Å) and two longer (2.02 Å) Ti(1)-O(7) bond lengths. In the second Ti site, Ti(2) is bonded in a 5-coordinate geometry to one O(5) and four equivalent O(1) atoms. The Ti(2)-O(5) bond length is 1.70 Å. There are two shorter (2.00 Å) and two longer (2.03 Å) Ti(2)-O(1) bond lengths. Nb(1) is bonded in a 6-coordinate geometry to one O(4), one O(6), and four equivalent O(2) atoms. The Nb(1)-O(4) bond length is 2.36 Å. The Nb(1)-O(6) bond length is 1.79 Å. There are two shorter (1.98 Å) and two longer (2.03 Å) Nb(1)-O(2) bond lengths. There are seven inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sm(1) and two equivalent Ti(2) atoms to form a mixture of distorted corner and edge-sharing OSm2Ti2 tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Sm(2) and two equivalent Nb(1) atoms. In the third O site, O(3) is bonded in a distorted single-bond geometry to four equivalent Sm(1) and one Ti(1) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to four equivalent Sm(2), one Ti(1), and one Nb(1) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to four equivalent Cs(1) and one Ti(2) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to four equivalent Cs(1) and one Nb(1) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one Sm(1), two equivalent Sm(2), and two equivalent Ti(1) atoms.