The material structure described by NaSm3Ti2(SbO7)2 crystallizes in the monoclinic C2/m space group. Na(1) is bonded to two equivalent O(2), two equivalent O(5), and four equivalent O(4) atoms to form distorted NaO8 hexagonal bipyramids that share edges with two equivalent Sm(1)O8 hexagonal bipyramids, edges with four equivalent Sm(2)O8 hexagonal bipyramids, edges with two equivalent Ti(2)O6 octahedra, and edges with four equivalent Sb(1)O6 octahedra. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to two equivalent O(2), two equivalent O(5), and four equivalent O(3) atoms to form distorted SmO8 hexagonal bipyramids that share edges with two equivalent Na(1)O8 hexagonal bipyramids, edges with four equivalent Sm(2)O8 hexagonal bipyramids, edges with two equivalent Ti(1)O6 octahedra, and edges with four equivalent Sb(1)O6 octahedra. In the second Sm site, Sm(2) is bonded to two equivalent O(1), two equivalent O(3), two equivalent O(4), and two equivalent O(5) 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(1)O6 octahedra. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form TiO6 octahedra that share corners with two equivalent Ti(2)O6 octahedra, corners with four equivalent Sb(1)O6 octahedra, edges with two equivalent Sm(1)O8 hexagonal bipyramids, and edges with four equivalent Sm(2)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 44-47°. In the second Ti site, Ti(2) is bonded to two equivalent O(1) and four equivalent O(4) atoms to form TiO6 octahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with four equivalent Sb(1)O6 octahedra, edges with two equivalent Na(1)O8 hexagonal bipyramids, and edges with four equivalent Sm(2)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 44°. Sb(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) 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(1)O8 hexagonal bipyramids, and edges with two equivalent Sm(2)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 44-47°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Sm(2), one Ti(1), and one Ti(2) atom. In the second O site, O(2) is bonded to one Na(1), one Sm(1), and two equivalent Sb(1) atoms to form distorted ONaSmSb2 tetrahedra that share corners with two equivalent O(5)NaSm3 tetrahedra, corners with four equivalent O(2)NaSmSb2 tetrahedra, and  an edgeedge with one O(5)NaSm3 tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Sm(1), one Sm(2), one Ti(1), and one Sb(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Na(1), one Sm(2), one Ti(2), and one Sb(1) atom. In the fifth O site, O(5) is bonded to one Na(1), one Sm(1), and two equivalent Sm(2) atoms to form ONaSm3 tetrahedra that share corners with two equivalent O(2)NaSmSb2 tetrahedra, corners with four equivalent O(5)NaSm3 tetrahedra, and  an edgeedge with one O(2)NaSmSb2 tetrahedra. is represented by the CIF file [CIF]
data_NaSm3Ti2(SbO7)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.333
_cell_length_b   7.333
_cell_length_c   7.295
_cell_angle_alpha   60.782
_cell_angle_beta   60.782
_cell_angle_gamma   60.997
_symmetry_Int_Tables_number   1
_cell_volume   282.698
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Na  Na0  1  0.000  0.000  0.000  1.0
  Sm  Sm1  1  0.000  0.000  0.500  1.0
  Sm  Sm2  1  0.500  0.000  0.000  1.0
  Sm  Sm3  1  0.000  0.500  0.000  1.0
  Ti  Ti4  1  0.500  0.500  0.500  1.0
  Ti  Ti5  1  0.500  0.500  0.000  1.0
  Sb  Sb6  1  0.000  0.500  0.500  1.0
  Sb  Sb7  1  0.500  0.000  0.500  1.0
  O  O8  1  0.571  0.571  0.182  1.0
  O  O9  1  0.173  0.173  0.571  1.0
  O  O10  1  0.176  0.577  0.576  1.0
  O  O11  1  0.562  0.180  0.179  1.0
  O  O12  1  0.180  0.562  0.179  1.0
  O  O13  1  0.577  0.176  0.576  1.0
  O  O14  1  0.429  0.429  0.818  1.0
  O  O15  1  0.827  0.827  0.429  1.0
  O  O16  1  0.824  0.423  0.424  1.0
  O  O17  1  0.438  0.820  0.821  1.0
  O  O18  1  0.820  0.438  0.821  1.0
  O  O19  1  0.423  0.824  0.424  1.0
  O  O20  1  0.870  0.870  0.873  1.0
  O  O21  1  0.130  0.130  0.127  1.0
[/CIF]
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The material structure described by NaSm3Ti2(SbO7)2 crystallizes in the monoclinic C2/m space group. Na(1) is bonded to two equivalent O(2), two equivalent O(5), and four equivalent O(4) atoms to form distorted NaO8 hexagonal bipyramids that share edges with two equivalent Sm(1)O8 hexagonal bipyramids, edges with four equivalent Sm(2)O8 hexagonal bipyramids, edges with two equivalent Ti(2)O6 octahedra, and edges with four equivalent Sb(1)O6 octahedra. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to two equivalent O(2), two equivalent O(5), and four equivalent O(3) atoms to form distorted SmO8 hexagonal bipyramids that share edges with two equivalent Na(1)O8 hexagonal bipyramids, edges with four equivalent Sm(2)O8 hexagonal bipyramids, edges with two equivalent Ti(1)O6 octahedra, and edges with four equivalent Sb(1)O6 octahedra. In the second Sm site, Sm(2) is bonded to two equivalent O(1), two equivalent O(3), two equivalent O(4), and two equivalent O(5) 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(1)O6 octahedra. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form TiO6 octahedra that share corners with two equivalent Ti(2)O6 octahedra, corners with four equivalent Sb(1)O6 octahedra, edges with two equivalent Sm(1)O8 hexagonal bipyramids, and edges with four equivalent Sm(2)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 44-47°. In the second Ti site, Ti(2) is bonded to two equivalent O(1) and four equivalent O(4) atoms to form TiO6 octahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with four equivalent Sb(1)O6 octahedra, edges with two equivalent Na(1)O8 hexagonal bipyramids, and edges with four equivalent Sm(2)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 44°. Sb(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) 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(1)O8 hexagonal bipyramids, and edges with two equivalent Sm(2)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 44-47°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Sm(2), one Ti(1), and one Ti(2) atom. In the second O site, O(2) is bonded to one Na(1), one Sm(1), and two equivalent Sb(1) atoms to form distorted ONaSmSb2 tetrahedra that share corners with two equivalent O(5)NaSm3 tetrahedra, corners with four equivalent O(2)NaSmSb2 tetrahedra, and  an edgeedge with one O(5)NaSm3 tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Sm(1), one Sm(2), one Ti(1), and one Sb(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Na(1), one Sm(2), one Ti(2), and one Sb(1) atom. In the fifth O site, O(5) is bonded to one Na(1), one Sm(1), and two equivalent Sm(2) atoms to form ONaSm3 tetrahedra that share corners with two equivalent O(2)NaSmSb2 tetrahedra, corners with four equivalent O(5)NaSm3 tetrahedra, and  an edgeedge with one O(2)NaSmSb2 tetrahedra. is represented by the CIF file [CIF]
data_NaSm3Ti2(SbO7)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.333
_cell_length_b   7.333
_cell_length_c   7.295
_cell_angle_alpha   60.782
_cell_angle_beta   60.782
_cell_angle_gamma   60.997
_symmetry_Int_Tables_number   1
_cell_volume   282.698
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Na  Na0  1  0.000  0.000  0.000  1.0
  Sm  Sm1  1  0.000  0.000  0.500  1.0
  Sm  Sm2  1  0.500  0.000  0.000  1.0
  Sm  Sm3  1  0.000  0.500  0.000  1.0
  Ti  Ti4  1  0.500  0.500  0.500  1.0
  Ti  Ti5  1  0.500  0.500  0.000  1.0
  Sb  Sb6  1  0.000  0.500  0.500  1.0
  Sb  Sb7  1  0.500  0.000  0.500  1.0
  O  O8  1  0.571  0.571  0.182  1.0
  O  O9  1  0.173  0.173  0.571  1.0
  O  O10  1  0.176  0.577  0.576  1.0
  O  O11  1  0.562  0.180  0.179  1.0
  O  O12  1  0.180  0.562  0.179  1.0
  O  O13  1  0.577  0.176  0.576  1.0
  O  O14  1  0.429  0.429  0.818  1.0
  O  O15  1  0.827  0.827  0.429  1.0
  O  O16  1  0.824  0.423  0.424  1.0
  O  O17  1  0.438  0.820  0.821  1.0
  O  O18  1  0.820  0.438  0.821  1.0
  O  O19  1  0.423  0.824  0.424  1.0
  O  O20  1  0.870  0.870  0.873  1.0
  O  O21  1  0.130  0.130  0.127  1.0
[/CIF]
.