The material described by NaNd3Ti2(SbO7)2 crystallizes in the monoclinic P2/c space group. Na(1) is bonded to two equivalent O(1), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms to form distorted NaO8 hexagonal bipyramids that share edges with two equivalent Nd(1)O8 hexagonal bipyramids, edges with two equivalent Nd(2)O8 hexagonal bipyramids, edges with two equivalent Nd(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. There are three inequivalent Nd sites. In the first Nd site, Nd(1) is bonded to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form distorted NdO8 hexagonal bipyramids that share edges with two equivalent Na(1)O8 hexagonal bipyramids, edges with two equivalent Nd(2)O8 hexagonal bipyramids, edges with two equivalent Nd(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(2)O6 octahedra. In the second Nd site, Nd(2) is bonded to two equivalent O(1), two equivalent O(3), two equivalent O(4), and two equivalent O(7) atoms to form distorted NdO8 hexagonal bipyramids that share edges with two equivalent Na(1)O8 hexagonal bipyramids, edges with two equivalent Nd(1)O8 hexagonal bipyramids, edges with two equivalent Nd(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. In the third Nd site, Nd(3) is bonded to two equivalent O(1), two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form distorted NdO8 hexagonal bipyramids that share edges with two equivalent Na(1)O8 hexagonal bipyramids, edges with two equivalent Nd(1)O8 hexagonal bipyramids, edges with two equivalent Nd(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(2), two equivalent O(3), and two equivalent O(4) 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 Nd(1)O8 hexagonal bipyramids, edges with two equivalent Nd(2)O8 hexagonal bipyramids, and edges with two equivalent Nd(3)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 42-46°. In the second Ti site, Ti(2) is bonded to two equivalent O(2), two equivalent O(5), and two equivalent O(6) 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 Na(1)O8 hexagonal bipyramids, edges with two equivalent Nd(1)O8 hexagonal bipyramids, and edges with two equivalent Nd(3)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 42-43°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent O(4), two equivalent O(6), 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(2)O6 octahedra, edges with two equivalent Na(1)O8 hexagonal bipyramids, edges with two equivalent Nd(2)O8 hexagonal bipyramids, and edges with two equivalent Nd(3)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 43-47°. In the second Sb site, Sb(2) is bonded to two equivalent O(3), two equivalent O(5), 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 Nd(1)O8 hexagonal bipyramids, and edges with two equivalent Nd(2)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 43-47°. There are seven inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Nd(1), one Nd(2), and one Nd(3) atom to form ONaNd3 tetrahedra that share corners with two equivalent O(7)NaNdSb2 tetrahedra, corners with four equivalent O(1)NaNd3 tetrahedra, and  an edgeedge with one O(7)NaNdSb2 tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Nd(1), one Nd(3), one Ti(1), and one Ti(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Nd(1), one Nd(2), one Ti(1), and one Sb(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Nd(2), one Nd(3), one Ti(1), and one Sb(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Na(1), one Nd(1), one Ti(2), and one Sb(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Na(1), one Nd(3), one Ti(2), and one Sb(1) atom. In the seventh O site, O(7) is bonded to one Na(1), one Nd(2), one Sb(1), and one Sb(2) atom to form distorted ONaNdSb2 tetrahedra that share corners with two equivalent O(1)NaNd3 tetrahedra, corners with two equivalent O(7)NaNdSb2 tetrahedra,  an edgeedge with one O(1)NaNd3 tetrahedra, and  an edgeedge with one O(7)NaNdSb2 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_NaNd3Ti2(SbO7)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.382
_cell_length_b   7.433
_cell_length_c   12.805
_cell_angle_alpha   54.873
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   574.688
_cell_formula_units_Z   2
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  0.500  0.500  0.000  1.0
  Na  Na1  1  0.500  0.500  0.500  1.0
  Nd  Nd2  1  0.271  0.000  0.750  1.0
  Nd  Nd3  1  0.258  0.500  0.750  1.0
  Nd  Nd4  1  0.742  0.500  0.250  1.0
  Nd  Nd5  1  0.000  0.500  0.000  1.0
  Nd  Nd6  1  0.729  0.000  0.250  1.0
  Nd  Nd7  1  0.000  0.500  0.500  1.0
  Ti  Ti8  1  0.000  0.000  0.500  1.0
  Ti  Ti9  1  0.000  0.000  0.000  1.0
  Ti  Ti10  1  0.762  0.000  0.750  1.0
  Ti  Ti11  1  0.238  0.000  0.250  1.0
  Sb  Sb12  1  0.245  0.500  0.250  1.0
  Sb  Sb13  1  0.755  0.500  0.750  1.0
  Sb  Sb14  1  0.500  0.000  0.000  1.0
  Sb  Sb15  1  0.500  0.000  0.500  1.0
  O  O16  1  0.249  0.629  0.873  1.0
  O  O17  1  0.053  0.072  0.122  1.0
  O  O18  1  0.250  0.076  0.924  1.0
  O  O19  1  0.751  0.629  0.373  1.0
  O  O20  1  0.046  0.678  0.123  1.0
  O  O21  1  0.555  0.056  0.631  1.0
  O  O22  1  0.947  0.072  0.622  1.0
  O  O23  1  0.046  0.322  0.377  1.0
  O  O24  1  0.768  0.681  0.819  1.0
  O  O25  1  0.750  0.076  0.424  1.0
  O  O26  1  0.232  0.319  0.181  1.0
  O  O27  1  0.250  0.924  0.576  1.0
  O  O28  1  0.549  0.673  0.628  1.0
  O  O29  1  0.053  0.928  0.378  1.0
  O  O30  1  0.954  0.678  0.623  1.0
  O  O31  1  0.549  0.327  0.872  1.0
  O  O32  1  0.445  0.056  0.131  1.0
  O  O33  1  0.954  0.322  0.877  1.0
  O  O34  1  0.768  0.319  0.681  1.0
  O  O35  1  0.232  0.681  0.319  1.0
  O  O36  1  0.249  0.371  0.627  1.0
  O  O37  1  0.750  0.924  0.076  1.0
  O  O38  1  0.555  0.944  0.869  1.0
  O  O39  1  0.451  0.673  0.128  1.0
  O  O40  1  0.947  0.928  0.878  1.0
  O  O41  1  0.451  0.327  0.372  1.0
  O  O42  1  0.751  0.371  0.127  1.0
  O  O43  1  0.445  0.944  0.369  1.0
[/CIF]
.
The material described by NaNd3Ti2(SbO7)2 crystallizes in the monoclinic P2/c space group. Na(1) is bonded to two equivalent O(1), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms to form distorted NaO8 hexagonal bipyramids that share edges with two equivalent Nd(1)O8 hexagonal bipyramids, edges with two equivalent Nd(2)O8 hexagonal bipyramids, edges with two equivalent Nd(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. There are three inequivalent Nd sites. In the first Nd site, Nd(1) is bonded to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form distorted NdO8 hexagonal bipyramids that share edges with two equivalent Na(1)O8 hexagonal bipyramids, edges with two equivalent Nd(2)O8 hexagonal bipyramids, edges with two equivalent Nd(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(2)O6 octahedra. In the second Nd site, Nd(2) is bonded to two equivalent O(1), two equivalent O(3), two equivalent O(4), and two equivalent O(7) atoms to form distorted NdO8 hexagonal bipyramids that share edges with two equivalent Na(1)O8 hexagonal bipyramids, edges with two equivalent Nd(1)O8 hexagonal bipyramids, edges with two equivalent Nd(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. In the third Nd site, Nd(3) is bonded to two equivalent O(1), two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form distorted NdO8 hexagonal bipyramids that share edges with two equivalent Na(1)O8 hexagonal bipyramids, edges with two equivalent Nd(1)O8 hexagonal bipyramids, edges with two equivalent Nd(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(2), two equivalent O(3), and two equivalent O(4) 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 Nd(1)O8 hexagonal bipyramids, edges with two equivalent Nd(2)O8 hexagonal bipyramids, and edges with two equivalent Nd(3)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 42-46°. In the second Ti site, Ti(2) is bonded to two equivalent O(2), two equivalent O(5), and two equivalent O(6) 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 Na(1)O8 hexagonal bipyramids, edges with two equivalent Nd(1)O8 hexagonal bipyramids, and edges with two equivalent Nd(3)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 42-43°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent O(4), two equivalent O(6), 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(2)O6 octahedra, edges with two equivalent Na(1)O8 hexagonal bipyramids, edges with two equivalent Nd(2)O8 hexagonal bipyramids, and edges with two equivalent Nd(3)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 43-47°. In the second Sb site, Sb(2) is bonded to two equivalent O(3), two equivalent O(5), 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 Nd(1)O8 hexagonal bipyramids, and edges with two equivalent Nd(2)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 43-47°. There are seven inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Nd(1), one Nd(2), and one Nd(3) atom to form ONaNd3 tetrahedra that share corners with two equivalent O(7)NaNdSb2 tetrahedra, corners with four equivalent O(1)NaNd3 tetrahedra, and  an edgeedge with one O(7)NaNdSb2 tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Nd(1), one Nd(3), one Ti(1), and one Ti(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Nd(1), one Nd(2), one Ti(1), and one Sb(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Nd(2), one Nd(3), one Ti(1), and one Sb(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Na(1), one Nd(1), one Ti(2), and one Sb(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Na(1), one Nd(3), one Ti(2), and one Sb(1) atom. In the seventh O site, O(7) is bonded to one Na(1), one Nd(2), one Sb(1), and one Sb(2) atom to form distorted ONaNdSb2 tetrahedra that share corners with two equivalent O(1)NaNd3 tetrahedra, corners with two equivalent O(7)NaNdSb2 tetrahedra,  an edgeedge with one O(1)NaNd3 tetrahedra, and  an edgeedge with one O(7)NaNdSb2 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_NaNd3Ti2(SbO7)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.382
_cell_length_b   7.433
_cell_length_c   12.805
_cell_angle_alpha   54.873
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   574.688
_cell_formula_units_Z   2
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  0.500  0.500  0.000  1.0
  Na  Na1  1  0.500  0.500  0.500  1.0
  Nd  Nd2  1  0.271  0.000  0.750  1.0
  Nd  Nd3  1  0.258  0.500  0.750  1.0
  Nd  Nd4  1  0.742  0.500  0.250  1.0
  Nd  Nd5  1  0.000  0.500  0.000  1.0
  Nd  Nd6  1  0.729  0.000  0.250  1.0
  Nd  Nd7  1  0.000  0.500  0.500  1.0
  Ti  Ti8  1  0.000  0.000  0.500  1.0
  Ti  Ti9  1  0.000  0.000  0.000  1.0
  Ti  Ti10  1  0.762  0.000  0.750  1.0
  Ti  Ti11  1  0.238  0.000  0.250  1.0
  Sb  Sb12  1  0.245  0.500  0.250  1.0
  Sb  Sb13  1  0.755  0.500  0.750  1.0
  Sb  Sb14  1  0.500  0.000  0.000  1.0
  Sb  Sb15  1  0.500  0.000  0.500  1.0
  O  O16  1  0.249  0.629  0.873  1.0
  O  O17  1  0.053  0.072  0.122  1.0
  O  O18  1  0.250  0.076  0.924  1.0
  O  O19  1  0.751  0.629  0.373  1.0
  O  O20  1  0.046  0.678  0.123  1.0
  O  O21  1  0.555  0.056  0.631  1.0
  O  O22  1  0.947  0.072  0.622  1.0
  O  O23  1  0.046  0.322  0.377  1.0
  O  O24  1  0.768  0.681  0.819  1.0
  O  O25  1  0.750  0.076  0.424  1.0
  O  O26  1  0.232  0.319  0.181  1.0
  O  O27  1  0.250  0.924  0.576  1.0
  O  O28  1  0.549  0.673  0.628  1.0
  O  O29  1  0.053  0.928  0.378  1.0
  O  O30  1  0.954  0.678  0.623  1.0
  O  O31  1  0.549  0.327  0.872  1.0
  O  O32  1  0.445  0.056  0.131  1.0
  O  O33  1  0.954  0.322  0.877  1.0
  O  O34  1  0.768  0.319  0.681  1.0
  O  O35  1  0.232  0.681  0.319  1.0
  O  O36  1  0.249  0.371  0.627  1.0
  O  O37  1  0.750  0.924  0.076  1.0
  O  O38  1  0.555  0.944  0.869  1.0
  O  O39  1  0.451  0.673  0.128  1.0
  O  O40  1  0.947  0.928  0.878  1.0
  O  O41  1  0.451  0.327  0.372  1.0
  O  O42  1  0.751  0.371  0.127  1.0
  O  O43  1  0.445  0.944  0.369  1.0
[/CIF]
.