The structure described by Na(Sm2Se3)4 crystallizes in the tetragonal I-42d space group. Na(1) is bonded to four equivalent Se(1) and four equivalent Se(2) atoms to form distorted NaSe8 hexagonal bipyramids that share corners with eight equivalent Sm(1)Se8 hexagonal bipyramids, edges with four equivalent Sm(2)Se8 hexagonal bipyramids, faces with four equivalent Sm(1)Se8 hexagonal bipyramids, and faces with four equivalent Sm(3)Se8 hexagonal bipyramids. There are three inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to two equivalent Se(2), three equivalent Se(1), and three equivalent Se(3) atoms to form distorted SmSe8 hexagonal bipyramids that share corners with two equivalent Na(1)Se8 hexagonal bipyramids, corners with two equivalent Sm(1)Se8 hexagonal bipyramids, corners with two equivalent Sm(2)Se8 hexagonal bipyramids, corners with two equivalent Sm(3)Se8 hexagonal bipyramids,  an edgeedge with one Sm(3)Se8 hexagonal bipyramid, edges with three equivalent Sm(1)Se8 hexagonal bipyramids,  a faceface with one Na(1)Se8 hexagonal bipyramid, faces with two equivalent Sm(1)Se8 hexagonal bipyramids, faces with two equivalent Sm(3)Se8 hexagonal bipyramids, and faces with three equivalent Sm(2)Se8 hexagonal bipyramids. In the second Sm site, Sm(2) is bonded to two equivalent Se(1), two equivalent Se(2), and four equivalent Se(3) atoms to form distorted SmSe8 hexagonal bipyramids that share corners with four equivalent Sm(1)Se8 hexagonal bipyramids, corners with four equivalent Sm(3)Se8 hexagonal bipyramids, edges with two equivalent Na(1)Se8 hexagonal bipyramids, edges with two equivalent Sm(2)Se8 hexagonal bipyramids, faces with two equivalent Sm(3)Se8 hexagonal bipyramids, and faces with six equivalent Sm(1)Se8 hexagonal bipyramids. In the third Sm site, Sm(3) is bonded to two equivalent Se(1), two equivalent Se(3), and four equivalent Se(2) atoms to form distorted SmSe8 hexagonal bipyramids that share corners with four equivalent Sm(1)Se8 hexagonal bipyramids, corners with four equivalent Sm(2)Se8 hexagonal bipyramids, edges with two equivalent Sm(1)Se8 hexagonal bipyramids, edges with two equivalent Sm(3)Se8 hexagonal bipyramids, faces with two equivalent Na(1)Se8 hexagonal bipyramids, faces with two equivalent Sm(2)Se8 hexagonal bipyramids, and faces with four equivalent Sm(1)Se8 hexagonal bipyramids. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded to one Na(1), one Sm(2), one Sm(3), and three equivalent Sm(1) atoms to form distorted SeNaSm5 octahedra that share corners with four equivalent Se(1)NaSm5 octahedra, corners with four equivalent Se(2)NaSm5 octahedra, corners with seven equivalent Se(3)Sm6 octahedra,  an edgeedge with one Se(3)Sm6 octahedra, edges with two equivalent Se(1)NaSm5 octahedra, edges with three equivalent Se(2)NaSm5 octahedra,  a faceface with one Se(1)NaSm5 octahedra, faces with two equivalent Se(2)NaSm5 octahedra, and faces with two equivalent Se(3)Sm6 octahedra. The corner-sharing octahedral tilt angles range from 14-52°. In the second Se site, Se(2) is bonded to one Na(1), one Sm(2), two equivalent Sm(1), and two equivalent Sm(3) atoms to form distorted SeNaSm5 octahedra that share corners with four equivalent Se(1)NaSm5 octahedra, corners with five equivalent Se(3)Sm6 octahedra, corners with six equivalent Se(2)NaSm5 octahedra, edges with three equivalent Se(1)NaSm5 octahedra, edges with three equivalent Se(3)Sm6 octahedra,  a faceface with one Se(3)Sm6 octahedra, faces with two equivalent Se(1)NaSm5 octahedra, and faces with two equivalent Se(2)NaSm5 octahedra. The corner-sharing octahedral tilt angles range from 19-50°. In the third Se site, Se(3) is bonded to one Sm(3), two equivalent Sm(2), and three equivalent Sm(1) atoms to form distorted SeSm6 octahedra that share corners with three equivalent Se(3)Sm6 octahedra, corners with five equivalent Se(2)NaSm5 octahedra, corners with seven equivalent Se(1)NaSm5 octahedra,  an edgeedge with one Se(1)NaSm5 octahedra, edges with two equivalent Se(3)Sm6 octahedra, edges with three equivalent Se(2)NaSm5 octahedra,  a faceface with one Se(2)NaSm5 octahedra, faces with two equivalent Se(1)NaSm5 octahedra, and faces with two equivalent Se(3)Sm6 octahedra. The corner-sharing octahedral tilt angles range from 16-52°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na(Sm2Se3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   14.722
_cell_length_b   14.722
_cell_length_c   14.722
_cell_angle_alpha   144.997
_cell_angle_beta   144.997
_cell_angle_gamma   50.339
_symmetry_Int_Tables_number   1
_cell_volume   1044.772
_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  0.250  0.750  0.500  1.0
  Sm  Sm2  1  0.168  0.294  0.382  1.0
  Sm  Sm3  1  0.913  0.787  0.618  1.0
  Sm  Sm4  1  0.213  0.832  0.126  1.0
  Sm  Sm5  1  0.918  0.418  0.500  1.0
  Sm  Sm6  1  0.495  0.625  0.370  1.0
  Sm  Sm7  1  0.706  0.087  0.874  1.0
  Sm  Sm8  1  0.255  0.125  0.630  1.0
  Sm  Sm9  1  0.832  0.832  0.000  1.0
  Sm  Sm10  1  0.537  0.163  0.118  1.0
  Sm  Sm11  1  0.837  0.956  0.374  1.0
  Sm  Sm12  1  0.044  0.418  0.882  1.0
  Sm  Sm13  1  0.582  0.463  0.626  1.0
  Sm  Sm14  1  0.168  0.168  0.000  1.0
  Sm  Sm15  1  0.875  0.505  0.130  1.0
  Sm  Sm16  1  0.582  0.082  0.500  1.0
  Sm  Sm17  1  0.375  0.745  0.870  1.0
  Se  Se18  1  0.406  0.158  0.597  1.0
  Se  Se19  1  0.191  0.594  0.752  1.0
  Se  Se20  1  0.842  0.439  0.248  1.0
  Se  Se21  1  0.216  0.469  0.892  1.0
  Se  Se22  1  0.578  0.324  0.108  1.0
  Se  Se23  1  0.006  0.110  0.248  1.0
  Se  Se24  1  0.561  0.809  0.403  1.0
  Se  Se25  1  0.862  0.758  0.752  1.0
  Se  Se26  1  0.744  0.492  0.604  1.0
  Se  Se27  1  0.534  0.926  0.753  1.0
  Se  Se28  1  0.172  0.781  0.247  1.0
  Se  Se29  1  0.559  0.811  0.903  1.0
  Se  Se30  1  0.908  0.656  0.097  1.0
  Se  Se31  1  0.344  0.441  0.252  1.0
  Se  Se32  1  0.888  0.140  0.396  1.0
  Se  Se33  1  0.189  0.092  0.748  1.0
  Se  Se34  1  0.074  0.828  0.608  1.0
  Se  Se35  1  0.860  0.256  0.748  1.0
  Se  Se36  1  0.508  0.112  0.252  1.0
  Se  Se37  1  0.890  0.138  0.896  1.0
  Se  Se38  1  0.242  0.994  0.104  1.0
  Se  Se39  1  0.676  0.784  0.253  1.0
  Se  Se40  1  0.219  0.466  0.392  1.0
  Se  Se41  1  0.531  0.422  0.747  1.0
[/CIF]
.
The structure described by Na(Sm2Se3)4 crystallizes in the tetragonal I-42d space group. Na(1) is bonded to four equivalent Se(1) and four equivalent Se(2) atoms to form distorted NaSe8 hexagonal bipyramids that share corners with eight equivalent Sm(1)Se8 hexagonal bipyramids, edges with four equivalent Sm(2)Se8 hexagonal bipyramids, faces with four equivalent Sm(1)Se8 hexagonal bipyramids, and faces with four equivalent Sm(3)Se8 hexagonal bipyramids. There are three inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to two equivalent Se(2), three equivalent Se(1), and three equivalent Se(3) atoms to form distorted SmSe8 hexagonal bipyramids that share corners with two equivalent Na(1)Se8 hexagonal bipyramids, corners with two equivalent Sm(1)Se8 hexagonal bipyramids, corners with two equivalent Sm(2)Se8 hexagonal bipyramids, corners with two equivalent Sm(3)Se8 hexagonal bipyramids,  an edgeedge with one Sm(3)Se8 hexagonal bipyramid, edges with three equivalent Sm(1)Se8 hexagonal bipyramids,  a faceface with one Na(1)Se8 hexagonal bipyramid, faces with two equivalent Sm(1)Se8 hexagonal bipyramids, faces with two equivalent Sm(3)Se8 hexagonal bipyramids, and faces with three equivalent Sm(2)Se8 hexagonal bipyramids. In the second Sm site, Sm(2) is bonded to two equivalent Se(1), two equivalent Se(2), and four equivalent Se(3) atoms to form distorted SmSe8 hexagonal bipyramids that share corners with four equivalent Sm(1)Se8 hexagonal bipyramids, corners with four equivalent Sm(3)Se8 hexagonal bipyramids, edges with two equivalent Na(1)Se8 hexagonal bipyramids, edges with two equivalent Sm(2)Se8 hexagonal bipyramids, faces with two equivalent Sm(3)Se8 hexagonal bipyramids, and faces with six equivalent Sm(1)Se8 hexagonal bipyramids. In the third Sm site, Sm(3) is bonded to two equivalent Se(1), two equivalent Se(3), and four equivalent Se(2) atoms to form distorted SmSe8 hexagonal bipyramids that share corners with four equivalent Sm(1)Se8 hexagonal bipyramids, corners with four equivalent Sm(2)Se8 hexagonal bipyramids, edges with two equivalent Sm(1)Se8 hexagonal bipyramids, edges with two equivalent Sm(3)Se8 hexagonal bipyramids, faces with two equivalent Na(1)Se8 hexagonal bipyramids, faces with two equivalent Sm(2)Se8 hexagonal bipyramids, and faces with four equivalent Sm(1)Se8 hexagonal bipyramids. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded to one Na(1), one Sm(2), one Sm(3), and three equivalent Sm(1) atoms to form distorted SeNaSm5 octahedra that share corners with four equivalent Se(1)NaSm5 octahedra, corners with four equivalent Se(2)NaSm5 octahedra, corners with seven equivalent Se(3)Sm6 octahedra,  an edgeedge with one Se(3)Sm6 octahedra, edges with two equivalent Se(1)NaSm5 octahedra, edges with three equivalent Se(2)NaSm5 octahedra,  a faceface with one Se(1)NaSm5 octahedra, faces with two equivalent Se(2)NaSm5 octahedra, and faces with two equivalent Se(3)Sm6 octahedra. The corner-sharing octahedral tilt angles range from 14-52°. In the second Se site, Se(2) is bonded to one Na(1), one Sm(2), two equivalent Sm(1), and two equivalent Sm(3) atoms to form distorted SeNaSm5 octahedra that share corners with four equivalent Se(1)NaSm5 octahedra, corners with five equivalent Se(3)Sm6 octahedra, corners with six equivalent Se(2)NaSm5 octahedra, edges with three equivalent Se(1)NaSm5 octahedra, edges with three equivalent Se(3)Sm6 octahedra,  a faceface with one Se(3)Sm6 octahedra, faces with two equivalent Se(1)NaSm5 octahedra, and faces with two equivalent Se(2)NaSm5 octahedra. The corner-sharing octahedral tilt angles range from 19-50°. In the third Se site, Se(3) is bonded to one Sm(3), two equivalent Sm(2), and three equivalent Sm(1) atoms to form distorted SeSm6 octahedra that share corners with three equivalent Se(3)Sm6 octahedra, corners with five equivalent Se(2)NaSm5 octahedra, corners with seven equivalent Se(1)NaSm5 octahedra,  an edgeedge with one Se(1)NaSm5 octahedra, edges with two equivalent Se(3)Sm6 octahedra, edges with three equivalent Se(2)NaSm5 octahedra,  a faceface with one Se(2)NaSm5 octahedra, faces with two equivalent Se(1)NaSm5 octahedra, and faces with two equivalent Se(3)Sm6 octahedra. The corner-sharing octahedral tilt angles range from 16-52°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na(Sm2Se3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   14.722
_cell_length_b   14.722
_cell_length_c   14.722
_cell_angle_alpha   144.997
_cell_angle_beta   144.997
_cell_angle_gamma   50.339
_symmetry_Int_Tables_number   1
_cell_volume   1044.772
_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  0.250  0.750  0.500  1.0
  Sm  Sm2  1  0.168  0.294  0.382  1.0
  Sm  Sm3  1  0.913  0.787  0.618  1.0
  Sm  Sm4  1  0.213  0.832  0.126  1.0
  Sm  Sm5  1  0.918  0.418  0.500  1.0
  Sm  Sm6  1  0.495  0.625  0.370  1.0
  Sm  Sm7  1  0.706  0.087  0.874  1.0
  Sm  Sm8  1  0.255  0.125  0.630  1.0
  Sm  Sm9  1  0.832  0.832  0.000  1.0
  Sm  Sm10  1  0.537  0.163  0.118  1.0
  Sm  Sm11  1  0.837  0.956  0.374  1.0
  Sm  Sm12  1  0.044  0.418  0.882  1.0
  Sm  Sm13  1  0.582  0.463  0.626  1.0
  Sm  Sm14  1  0.168  0.168  0.000  1.0
  Sm  Sm15  1  0.875  0.505  0.130  1.0
  Sm  Sm16  1  0.582  0.082  0.500  1.0
  Sm  Sm17  1  0.375  0.745  0.870  1.0
  Se  Se18  1  0.406  0.158  0.597  1.0
  Se  Se19  1  0.191  0.594  0.752  1.0
  Se  Se20  1  0.842  0.439  0.248  1.0
  Se  Se21  1  0.216  0.469  0.892  1.0
  Se  Se22  1  0.578  0.324  0.108  1.0
  Se  Se23  1  0.006  0.110  0.248  1.0
  Se  Se24  1  0.561  0.809  0.403  1.0
  Se  Se25  1  0.862  0.758  0.752  1.0
  Se  Se26  1  0.744  0.492  0.604  1.0
  Se  Se27  1  0.534  0.926  0.753  1.0
  Se  Se28  1  0.172  0.781  0.247  1.0
  Se  Se29  1  0.559  0.811  0.903  1.0
  Se  Se30  1  0.908  0.656  0.097  1.0
  Se  Se31  1  0.344  0.441  0.252  1.0
  Se  Se32  1  0.888  0.140  0.396  1.0
  Se  Se33  1  0.189  0.092  0.748  1.0
  Se  Se34  1  0.074  0.828  0.608  1.0
  Se  Se35  1  0.860  0.256  0.748  1.0
  Se  Se36  1  0.508  0.112  0.252  1.0
  Se  Se37  1  0.890  0.138  0.896  1.0
  Se  Se38  1  0.242  0.994  0.104  1.0
  Se  Se39  1  0.676  0.784  0.253  1.0
  Se  Se40  1  0.219  0.466  0.392  1.0
  Se  Se41  1  0.531  0.422  0.747  1.0
[/CIF]
.