The structure described by Na(Nd2Se3)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 Nd(1)Se8 hexagonal bipyramids, edges with four equivalent Nd(3)Se8 hexagonal bipyramids, faces with four equivalent Nd(1)Se8 hexagonal bipyramids, and faces with four equivalent Nd(2)Se8 hexagonal bipyramids. There are three inequivalent Nd sites. In the first Nd site, Nd(1) is bonded to two equivalent Se(2), three equivalent Se(1), and three equivalent Se(3) atoms to form distorted NdSe8 hexagonal bipyramids that share corners with two equivalent Na(1)Se8 hexagonal bipyramids, corners with two equivalent Nd(1)Se8 hexagonal bipyramids, corners with two equivalent Nd(2)Se8 hexagonal bipyramids, corners with two equivalent Nd(3)Se8 hexagonal bipyramids,  an edgeedge with one Nd(2)Se8 hexagonal bipyramid, edges with three equivalent Nd(1)Se8 hexagonal bipyramids,  a faceface with one Na(1)Se8 hexagonal bipyramid, faces with two equivalent Nd(1)Se8 hexagonal bipyramids, faces with two equivalent Nd(2)Se8 hexagonal bipyramids, and faces with three equivalent Nd(3)Se8 hexagonal bipyramids. In the second Nd site, Nd(2) is bonded to two equivalent Se(1), two equivalent Se(3), and four equivalent Se(2) atoms to form distorted NdSe8 hexagonal bipyramids that share corners with four equivalent Nd(1)Se8 hexagonal bipyramids, corners with four equivalent Nd(3)Se8 hexagonal bipyramids, edges with two equivalent Nd(1)Se8 hexagonal bipyramids, edges with two equivalent Nd(2)Se8 hexagonal bipyramids, faces with two equivalent Na(1)Se8 hexagonal bipyramids, faces with two equivalent Nd(3)Se8 hexagonal bipyramids, and faces with four equivalent Nd(1)Se8 hexagonal bipyramids. In the third Nd site, Nd(3) is bonded to two equivalent Se(1), two equivalent Se(2), and four equivalent Se(3) atoms to form distorted NdSe8 hexagonal bipyramids that share corners with four equivalent Nd(1)Se8 hexagonal bipyramids, corners with four equivalent Nd(2)Se8 hexagonal bipyramids, edges with two equivalent Na(1)Se8 hexagonal bipyramids, edges with two equivalent Nd(3)Se8 hexagonal bipyramids, faces with two equivalent Nd(2)Se8 hexagonal bipyramids, and faces with six equivalent Nd(1)Se8 hexagonal bipyramids. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded to one Na(1), one Nd(2), one Nd(3), and three equivalent Nd(1) atoms to form distorted SeNaNd5 octahedra that share corners with four equivalent Se(1)NaNd5 octahedra, corners with four equivalent Se(2)NaNd5 octahedra, corners with seven equivalent Se(3)Nd6 octahedra,  an edgeedge with one Se(3)Nd6 octahedra, edges with two equivalent Se(1)NaNd5 octahedra, edges with three equivalent Se(2)NaNd5 octahedra,  a faceface with one Se(1)NaNd5 octahedra, faces with two equivalent Se(2)NaNd5 octahedra, and faces with two equivalent Se(3)Nd6 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 Nd(3), two equivalent Nd(1), and two equivalent Nd(2) atoms to form distorted SeNaNd5 octahedra that share corners with four equivalent Se(1)NaNd5 octahedra, corners with five equivalent Se(3)Nd6 octahedra, corners with six equivalent Se(2)NaNd5 octahedra, edges with three equivalent Se(1)NaNd5 octahedra, edges with three equivalent Se(3)Nd6 octahedra,  a faceface with one Se(3)Nd6 octahedra, faces with two equivalent Se(1)NaNd5 octahedra, and faces with two equivalent Se(2)NaNd5 octahedra. The corner-sharing octahedral tilt angles range from 19-50°. In the third Se site, Se(3) is bonded to one Nd(2), two equivalent Nd(3), and three equivalent Nd(1) atoms to form distorted SeNd6 octahedra that share corners with three equivalent Se(3)Nd6 octahedra, corners with five equivalent Se(2)NaNd5 octahedra, corners with seven equivalent Se(1)NaNd5 octahedra,  an edgeedge with one Se(1)NaNd5 octahedra, edges with two equivalent Se(3)Nd6 octahedra, edges with three equivalent Se(2)NaNd5 octahedra,  a faceface with one Se(2)NaNd5 octahedra, faces with two equivalent Se(1)NaNd5 octahedra, and faces with two equivalent Se(3)Nd6 octahedra. The corner-sharing octahedral tilt angles range from 16-52°. is represented by the CIF card [CIF]
data_Na(Nd2Se3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   14.879
_cell_length_b   14.879
_cell_length_c   14.879
_cell_angle_alpha   145.006
_cell_angle_beta   145.006
_cell_angle_gamma   50.325
_symmetry_Int_Tables_number   1
_cell_volume   1077.962
_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
  Nd  Nd2  1  0.213  0.831  0.126  1.0
  Nd  Nd3  1  0.495  0.625  0.370  1.0
  Nd  Nd4  1  0.918  0.418  0.500  1.0
  Nd  Nd5  1  0.255  0.125  0.630  1.0
  Nd  Nd6  1  0.706  0.087  0.874  1.0
  Nd  Nd7  1  0.832  0.832  0.000  1.0
  Nd  Nd8  1  0.537  0.163  0.118  1.0
  Nd  Nd9  1  0.837  0.956  0.374  1.0
  Nd  Nd10  1  0.581  0.463  0.626  1.0
  Nd  Nd11  1  0.044  0.419  0.882  1.0
  Nd  Nd12  1  0.168  0.168  0.000  1.0
  Nd  Nd13  1  0.875  0.505  0.130  1.0
  Nd  Nd14  1  0.169  0.294  0.382  1.0
  Nd  Nd15  1  0.582  0.082  0.500  1.0
  Nd  Nd16  1  0.913  0.787  0.618  1.0
  Nd  Nd17  1  0.375  0.745  0.870  1.0
  Se  Se18  1  0.842  0.438  0.248  1.0
  Se  Se19  1  0.406  0.158  0.597  1.0
  Se  Se20  1  0.191  0.594  0.752  1.0
  Se  Se21  1  0.217  0.470  0.893  1.0
  Se  Se22  1  0.577  0.324  0.107  1.0
  Se  Se23  1  0.007  0.108  0.248  1.0
  Se  Se24  1  0.562  0.809  0.403  1.0
  Se  Se25  1  0.173  0.780  0.247  1.0
  Se  Se26  1  0.860  0.758  0.752  1.0
  Se  Se27  1  0.743  0.492  0.602  1.0
  Se  Se28  1  0.533  0.926  0.753  1.0
  Se  Se29  1  0.559  0.812  0.903  1.0
  Se  Se30  1  0.908  0.656  0.097  1.0
  Se  Se31  1  0.890  0.142  0.398  1.0
  Se  Se32  1  0.344  0.441  0.252  1.0
  Se  Se33  1  0.508  0.110  0.252  1.0
  Se  Se34  1  0.188  0.092  0.748  1.0
  Se  Se35  1  0.074  0.827  0.607  1.0
  Se  Se36  1  0.858  0.257  0.748  1.0
  Se  Se37  1  0.892  0.140  0.898  1.0
  Se  Se38  1  0.242  0.993  0.102  1.0
  Se  Se39  1  0.676  0.783  0.253  1.0
  Se  Se40  1  0.220  0.467  0.393  1.0
  Se  Se41  1  0.530  0.423  0.747  1.0
[/CIF]
.
The structure described by Na(Nd2Se3)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 Nd(1)Se8 hexagonal bipyramids, edges with four equivalent Nd(3)Se8 hexagonal bipyramids, faces with four equivalent Nd(1)Se8 hexagonal bipyramids, and faces with four equivalent Nd(2)Se8 hexagonal bipyramids. There are three inequivalent Nd sites. In the first Nd site, Nd(1) is bonded to two equivalent Se(2), three equivalent Se(1), and three equivalent Se(3) atoms to form distorted NdSe8 hexagonal bipyramids that share corners with two equivalent Na(1)Se8 hexagonal bipyramids, corners with two equivalent Nd(1)Se8 hexagonal bipyramids, corners with two equivalent Nd(2)Se8 hexagonal bipyramids, corners with two equivalent Nd(3)Se8 hexagonal bipyramids,  an edgeedge with one Nd(2)Se8 hexagonal bipyramid, edges with three equivalent Nd(1)Se8 hexagonal bipyramids,  a faceface with one Na(1)Se8 hexagonal bipyramid, faces with two equivalent Nd(1)Se8 hexagonal bipyramids, faces with two equivalent Nd(2)Se8 hexagonal bipyramids, and faces with three equivalent Nd(3)Se8 hexagonal bipyramids. In the second Nd site, Nd(2) is bonded to two equivalent Se(1), two equivalent Se(3), and four equivalent Se(2) atoms to form distorted NdSe8 hexagonal bipyramids that share corners with four equivalent Nd(1)Se8 hexagonal bipyramids, corners with four equivalent Nd(3)Se8 hexagonal bipyramids, edges with two equivalent Nd(1)Se8 hexagonal bipyramids, edges with two equivalent Nd(2)Se8 hexagonal bipyramids, faces with two equivalent Na(1)Se8 hexagonal bipyramids, faces with two equivalent Nd(3)Se8 hexagonal bipyramids, and faces with four equivalent Nd(1)Se8 hexagonal bipyramids. In the third Nd site, Nd(3) is bonded to two equivalent Se(1), two equivalent Se(2), and four equivalent Se(3) atoms to form distorted NdSe8 hexagonal bipyramids that share corners with four equivalent Nd(1)Se8 hexagonal bipyramids, corners with four equivalent Nd(2)Se8 hexagonal bipyramids, edges with two equivalent Na(1)Se8 hexagonal bipyramids, edges with two equivalent Nd(3)Se8 hexagonal bipyramids, faces with two equivalent Nd(2)Se8 hexagonal bipyramids, and faces with six equivalent Nd(1)Se8 hexagonal bipyramids. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded to one Na(1), one Nd(2), one Nd(3), and three equivalent Nd(1) atoms to form distorted SeNaNd5 octahedra that share corners with four equivalent Se(1)NaNd5 octahedra, corners with four equivalent Se(2)NaNd5 octahedra, corners with seven equivalent Se(3)Nd6 octahedra,  an edgeedge with one Se(3)Nd6 octahedra, edges with two equivalent Se(1)NaNd5 octahedra, edges with three equivalent Se(2)NaNd5 octahedra,  a faceface with one Se(1)NaNd5 octahedra, faces with two equivalent Se(2)NaNd5 octahedra, and faces with two equivalent Se(3)Nd6 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 Nd(3), two equivalent Nd(1), and two equivalent Nd(2) atoms to form distorted SeNaNd5 octahedra that share corners with four equivalent Se(1)NaNd5 octahedra, corners with five equivalent Se(3)Nd6 octahedra, corners with six equivalent Se(2)NaNd5 octahedra, edges with three equivalent Se(1)NaNd5 octahedra, edges with three equivalent Se(3)Nd6 octahedra,  a faceface with one Se(3)Nd6 octahedra, faces with two equivalent Se(1)NaNd5 octahedra, and faces with two equivalent Se(2)NaNd5 octahedra. The corner-sharing octahedral tilt angles range from 19-50°. In the third Se site, Se(3) is bonded to one Nd(2), two equivalent Nd(3), and three equivalent Nd(1) atoms to form distorted SeNd6 octahedra that share corners with three equivalent Se(3)Nd6 octahedra, corners with five equivalent Se(2)NaNd5 octahedra, corners with seven equivalent Se(1)NaNd5 octahedra,  an edgeedge with one Se(1)NaNd5 octahedra, edges with two equivalent Se(3)Nd6 octahedra, edges with three equivalent Se(2)NaNd5 octahedra,  a faceface with one Se(2)NaNd5 octahedra, faces with two equivalent Se(1)NaNd5 octahedra, and faces with two equivalent Se(3)Nd6 octahedra. The corner-sharing octahedral tilt angles range from 16-52°. is represented by the CIF card [CIF]
data_Na(Nd2Se3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   14.879
_cell_length_b   14.879
_cell_length_c   14.879
_cell_angle_alpha   145.006
_cell_angle_beta   145.006
_cell_angle_gamma   50.325
_symmetry_Int_Tables_number   1
_cell_volume   1077.962
_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
  Nd  Nd2  1  0.213  0.831  0.126  1.0
  Nd  Nd3  1  0.495  0.625  0.370  1.0
  Nd  Nd4  1  0.918  0.418  0.500  1.0
  Nd  Nd5  1  0.255  0.125  0.630  1.0
  Nd  Nd6  1  0.706  0.087  0.874  1.0
  Nd  Nd7  1  0.832  0.832  0.000  1.0
  Nd  Nd8  1  0.537  0.163  0.118  1.0
  Nd  Nd9  1  0.837  0.956  0.374  1.0
  Nd  Nd10  1  0.581  0.463  0.626  1.0
  Nd  Nd11  1  0.044  0.419  0.882  1.0
  Nd  Nd12  1  0.168  0.168  0.000  1.0
  Nd  Nd13  1  0.875  0.505  0.130  1.0
  Nd  Nd14  1  0.169  0.294  0.382  1.0
  Nd  Nd15  1  0.582  0.082  0.500  1.0
  Nd  Nd16  1  0.913  0.787  0.618  1.0
  Nd  Nd17  1  0.375  0.745  0.870  1.0
  Se  Se18  1  0.842  0.438  0.248  1.0
  Se  Se19  1  0.406  0.158  0.597  1.0
  Se  Se20  1  0.191  0.594  0.752  1.0
  Se  Se21  1  0.217  0.470  0.893  1.0
  Se  Se22  1  0.577  0.324  0.107  1.0
  Se  Se23  1  0.007  0.108  0.248  1.0
  Se  Se24  1  0.562  0.809  0.403  1.0
  Se  Se25  1  0.173  0.780  0.247  1.0
  Se  Se26  1  0.860  0.758  0.752  1.0
  Se  Se27  1  0.743  0.492  0.602  1.0
  Se  Se28  1  0.533  0.926  0.753  1.0
  Se  Se29  1  0.559  0.812  0.903  1.0
  Se  Se30  1  0.908  0.656  0.097  1.0
  Se  Se31  1  0.890  0.142  0.398  1.0
  Se  Se32  1  0.344  0.441  0.252  1.0
  Se  Se33  1  0.508  0.110  0.252  1.0
  Se  Se34  1  0.188  0.092  0.748  1.0
  Se  Se35  1  0.074  0.827  0.607  1.0
  Se  Se36  1  0.858  0.257  0.748  1.0
  Se  Se37  1  0.892  0.140  0.898  1.0
  Se  Se38  1  0.242  0.993  0.102  1.0
  Se  Se39  1  0.676  0.783  0.253  1.0
  Se  Se40  1  0.220  0.467  0.393  1.0
  Se  Se41  1  0.530  0.423  0.747  1.0
[/CIF]
.