NaSm3Ti2(SbO7)2 crystallizes in the monoclinic P2/c space group. Na(1) is bonded to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form distorted NaO8 hexagonal bipyramids that share edges with two equivalent Sm(1)O8 hexagonal bipyramids, edges with two equivalent Sm(2)O8 hexagonal bipyramids, edges with two equivalent Sm(3)O8 hexagonal bipyramids, edges with two equivalent Ti(1)O6 octahedra, edges with two equivalent Sb(1)O6 octahedra, and edges with two equivalent Sb(2)O6 octahedra. There are three inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to two equivalent O(1), two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms to form distorted SmO8 hexagonal bipyramids that share edges with two equivalent Na(1)O8 hexagonal bipyramids, edges with two equivalent Sm(2)O8 hexagonal bipyramids, edges with two equivalent Sm(3)O8 hexagonal bipyramids, edges with two equivalent Ti(1)O6 octahedra, edges with two equivalent Ti(2)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. In the second Sm site, Sm(2) is bonded to two equivalent O(2), two equivalent O(4), two equivalent O(6), and two equivalent O(7) atoms to form distorted SmO8 hexagonal bipyramids that share edges with two equivalent Na(1)O8 hexagonal bipyramids, edges with two equivalent Sm(1)O8 hexagonal bipyramids, edges with two equivalent Sm(3)O8 hexagonal bipyramids, edges with two equivalent Ti(2)O6 octahedra, edges with two equivalent Sb(1)O6 octahedra, and edges with two equivalent Sb(2)O6 octahedra. In the third Sm site, Sm(3) is bonded to two equivalent O(2), two equivalent O(3), two equivalent O(5), and two equivalent O(7) atoms to form distorted SmO8 hexagonal bipyramids that share edges with two equivalent Na(1)O8 hexagonal bipyramids, edges with two equivalent Sm(1)O8 hexagonal bipyramids, edges with two equivalent Sm(2)O8 hexagonal bipyramids, edges with two equivalent Ti(1)O6 octahedra, edges with two equivalent Ti(2)O6 octahedra, and edges with two equivalent Sb(2)O6 octahedra. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form TiO6 octahedra that share corners with two equivalent Ti(2)O6 octahedra, corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, edges with two equivalent Na(1)O8 hexagonal bipyramids, edges with two equivalent Sm(1)O8 hexagonal bipyramids, and edges with two equivalent Sm(3)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 43-44°. In the second Ti site, Ti(2) is bonded to two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms to form TiO6 octahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, edges with two equivalent Sm(1)O8 hexagonal bipyramids, edges with two equivalent Sm(2)O8 hexagonal bipyramids, and edges with two equivalent Sm(3)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 43-47°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms to form SbO6 octahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, edges with two equivalent Na(1)O8 hexagonal bipyramids, edges with two equivalent Sm(1)O8 hexagonal bipyramids, and edges with two equivalent Sm(2)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 44-47°. In the second Sb site, Sb(2) is bonded to two equivalent O(3), two equivalent O(4), and two equivalent O(7) atoms to form SbO6 octahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra, corners with two equivalent Sb(1)O6 octahedra, edges with two equivalent Na(1)O8 hexagonal bipyramids, edges with two equivalent Sm(2)O8 hexagonal bipyramids, and edges with two equivalent Sm(3)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 44-47°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), one Sm(1), one Ti(1), and one Sb(1) atom. In the second O site, O(2) is bonded to one Na(1), one Sm(1), one Sm(2), and one Sm(3) atom to form ONaSm3 tetrahedra that share corners with two equivalent O(4)NaSmSb2 tetrahedra, corners with four equivalent O(2)NaSm3 tetrahedra, and  an edgeedge with one O(4)NaSmSb2 tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Na(1), one Sm(3), one Ti(1), and one Sb(2) atom. In the fourth O site, O(4) is bonded to one Na(1), one Sm(2), one Sb(1), and one Sb(2) atom to form distorted ONaSmSb2 tetrahedra that share corners with two equivalent O(2)NaSm3 tetrahedra, corners with two equivalent O(4)NaSmSb2 tetrahedra,  an edgeedge with one O(2)NaSm3 tetrahedra, and  an edgeedge with one O(4)NaSmSb2 tetrahedra. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sm(1), one Sm(3), one Ti(1), and one Ti(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sm(1), one Sm(2), one Ti(2), and one Sb(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sm(2), one Sm(3), one Ti(2), and one Sb(2) atom.
NaSm3Ti2(SbO7)2 crystallizes in the monoclinic P2/c space group. Na(1) is bonded to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form distorted NaO8 hexagonal bipyramids that share edges with two equivalent Sm(1)O8 hexagonal bipyramids, edges with two equivalent Sm(2)O8 hexagonal bipyramids, edges with two equivalent Sm(3)O8 hexagonal bipyramids, edges with two equivalent Ti(1)O6 octahedra, edges with two equivalent Sb(1)O6 octahedra, and edges with two equivalent Sb(2)O6 octahedra. Both Na(1)-O(1) bond lengths are 2.71 Å. Both Na(1)-O(2) bond lengths are 2.31 Å. Both Na(1)-O(3) bond lengths are 2.72 Å. Both Na(1)-O(4) bond lengths are 2.60 Å. There are three inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to two equivalent O(1), two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms to form distorted SmO8 hexagonal bipyramids that share edges with two equivalent Na(1)O8 hexagonal bipyramids, edges with two equivalent Sm(2)O8 hexagonal bipyramids, edges with two equivalent Sm(3)O8 hexagonal bipyramids, edges with two equivalent Ti(1)O6 octahedra, edges with two equivalent Ti(2)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. Both Sm(1)-O(1) bond lengths are 2.44 Å. Both Sm(1)-O(2) bond lengths are 2.24 Å. Both Sm(1)-O(5) bond lengths are 2.76 Å. Both Sm(1)-O(6) bond lengths are 2.58 Å. In the second Sm site, Sm(2) is bonded to two equivalent O(2), two equivalent O(4), two equivalent O(6), and two equivalent O(7) atoms to form distorted SmO8 hexagonal bipyramids that share edges with two equivalent Na(1)O8 hexagonal bipyramids, edges with two equivalent Sm(1)O8 hexagonal bipyramids, edges with two equivalent Sm(3)O8 hexagonal bipyramids, edges with two equivalent Ti(2)O6 octahedra, edges with two equivalent Sb(1)O6 octahedra, and edges with two equivalent Sb(2)O6 octahedra. Both Sm(2)-O(2) bond lengths are 2.24 Å. Both Sm(2)-O(4) bond lengths are 2.51 Å. Both Sm(2)-O(6) bond lengths are 2.59 Å. Both Sm(2)-O(7) bond lengths are 2.61 Å. In the third Sm site, Sm(3) is bonded to two equivalent O(2), two equivalent O(3), two equivalent O(5), and two equivalent O(7) atoms to form distorted SmO8 hexagonal bipyramids that share edges with two equivalent Na(1)O8 hexagonal bipyramids, edges with two equivalent Sm(1)O8 hexagonal bipyramids, edges with two equivalent Sm(2)O8 hexagonal bipyramids, edges with two equivalent Ti(1)O6 octahedra, edges with two equivalent Ti(2)O6 octahedra, and edges with two equivalent Sb(2)O6 octahedra. Both Sm(3)-O(2) bond lengths are 2.24 Å. Both Sm(3)-O(3) bond lengths are 2.52 Å. Both Sm(3)-O(5) bond lengths are 2.62 Å. Both Sm(3)-O(7) bond lengths are 2.57 Å. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form TiO6 octahedra that share corners with two equivalent Ti(2)O6 octahedra, corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, edges with two equivalent Na(1)O8 hexagonal bipyramids, edges with two equivalent Sm(1)O8 hexagonal bipyramids, and edges with two equivalent Sm(3)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 43-44°. Both Ti(1)-O(1) bond lengths are 2.02 Å. Both Ti(1)-O(3) bond lengths are 1.99 Å. Both Ti(1)-O(5) bond lengths are 1.94 Å. In the second Ti site, Ti(2) is bonded to two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms to form TiO6 octahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, edges with two equivalent Sm(1)O8 hexagonal bipyramids, edges with two equivalent Sm(2)O8 hexagonal bipyramids, and edges with two equivalent Sm(3)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 43-47°. Both Ti(2)-O(5) bond lengths are 1.96 Å. Both Ti(2)-O(6) bond lengths are 2.00 Å. Both Ti(2)-O(7) bond lengths are 1.99 Å. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms to form SbO6 octahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, edges with two equivalent Na(1)O8 hexagonal bipyramids, edges with two equivalent Sm(1)O8 hexagonal bipyramids, and edges with two equivalent Sm(2)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 44-47°. Both Sb(1)-O(1) bond lengths are 1.99 Å. Both Sb(1)-O(4) bond lengths are 2.03 Å. Both Sb(1)-O(6) bond lengths are 2.01 Å. In the second Sb site, Sb(2) is bonded to two equivalent O(3), two equivalent O(4), and two equivalent O(7) atoms to form SbO6 octahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra, corners with two equivalent Sb(1)O6 octahedra, edges with two equivalent Na(1)O8 hexagonal bipyramids, edges with two equivalent Sm(2)O8 hexagonal bipyramids, and edges with two equivalent Sm(3)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 44-47°. Both Sb(2)-O(3) bond lengths are 1.99 Å. Both Sb(2)-O(4) bond lengths are 2.02 Å. Both Sb(2)-O(7) bond lengths are 2.01 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), one Sm(1), one Ti(1), and one Sb(1) atom. In the second O site, O(2) is bonded to one Na(1), one Sm(1), one Sm(2), and one Sm(3) atom to form ONaSm3 tetrahedra that share corners with two equivalent O(4)NaSmSb2 tetrahedra, corners with four equivalent O(2)NaSm3 tetrahedra, and  an edgeedge with one O(4)NaSmSb2 tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Na(1), one Sm(3), one Ti(1), and one Sb(2) atom. In the fourth O site, O(4) is bonded to one Na(1), one Sm(2), one Sb(1), and one Sb(2) atom to form distorted ONaSmSb2 tetrahedra that share corners with two equivalent O(2)NaSm3 tetrahedra, corners with two equivalent O(4)NaSmSb2 tetrahedra,  an edgeedge with one O(2)NaSm3 tetrahedra, and  an edgeedge with one O(4)NaSmSb2 tetrahedra. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sm(1), one Sm(3), one Ti(1), and one Ti(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sm(1), one Sm(2), one Ti(2), and one Sb(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sm(2), one Sm(3), one Ti(2), and one Sb(2) atom.