The material structure described by Na3NpO8 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. In the second Na site, Na(2) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Np(1) is bonded in a distorted octahedral geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted see-saw-like geometry to one Na(1), one Na(2), one Np(1), and one O(4) atom. In the second O site, O(2) is bonded to one Na(1), two equivalent Na(2), and one Np(1) atom to form a mixture of distorted corner and edge-sharing ONa3Np trigonal pyramids. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), two equivalent Na(2), and one Np(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Na(2), and one O(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na3NpO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.278
_cell_length_b   6.347
_cell_length_c   7.383
_cell_angle_alpha   59.186
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   333.141
_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  0.000  0.000  0.500  1.0
  Na  Na1  1  0.500  0.000  0.000  1.0
  Na  Na2  1  0.294  0.436  0.525  1.0
  Na  Na3  1  0.794  0.564  0.975  1.0
  Na  Na4  1  0.706  0.564  0.475  1.0
  Na  Na5  1  0.206  0.436  0.025  1.0
  Np  Np6  1  0.500  0.000  0.500  1.0
  Np  Np7  1  0.000  0.000  0.000  1.0
  O  O8  1  0.572  0.309  0.138  1.0
  O  O9  1  0.072  0.691  0.362  1.0
  O  O10  1  0.428  0.691  0.862  1.0
  O  O11  1  0.928  0.309  0.638  1.0
  O  O12  1  0.533  0.199  0.624  1.0
  O  O13  1  0.033  0.801  0.876  1.0
  O  O14  1  0.467  0.801  0.376  1.0
  O  O15  1  0.967  0.199  0.124  1.0
  O  O16  1  0.283  0.108  0.436  1.0
  O  O17  1  0.783  0.892  0.064  1.0
  O  O18  1  0.717  0.892  0.564  1.0
  O  O19  1  0.217  0.108  0.936  1.0
  O  O20  1  0.031  0.513  0.323  1.0
  O  O21  1  0.531  0.487  0.177  1.0
  O  O22  1  0.969  0.487  0.677  1.0
  O  O23  1  0.469  0.513  0.823  1.0
[/CIF]
.
The material structure described by Na3NpO8 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. In the second Na site, Na(2) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Np(1) is bonded in a distorted octahedral geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted see-saw-like geometry to one Na(1), one Na(2), one Np(1), and one O(4) atom. In the second O site, O(2) is bonded to one Na(1), two equivalent Na(2), and one Np(1) atom to form a mixture of distorted corner and edge-sharing ONa3Np trigonal pyramids. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), two equivalent Na(2), and one Np(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Na(2), and one O(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na3NpO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.278
_cell_length_b   6.347
_cell_length_c   7.383
_cell_angle_alpha   59.186
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   333.141
_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  0.000  0.000  0.500  1.0
  Na  Na1  1  0.500  0.000  0.000  1.0
  Na  Na2  1  0.294  0.436  0.525  1.0
  Na  Na3  1  0.794  0.564  0.975  1.0
  Na  Na4  1  0.706  0.564  0.475  1.0
  Na  Na5  1  0.206  0.436  0.025  1.0
  Np  Np6  1  0.500  0.000  0.500  1.0
  Np  Np7  1  0.000  0.000  0.000  1.0
  O  O8  1  0.572  0.309  0.138  1.0
  O  O9  1  0.072  0.691  0.362  1.0
  O  O10  1  0.428  0.691  0.862  1.0
  O  O11  1  0.928  0.309  0.638  1.0
  O  O12  1  0.533  0.199  0.624  1.0
  O  O13  1  0.033  0.801  0.876  1.0
  O  O14  1  0.467  0.801  0.376  1.0
  O  O15  1  0.967  0.199  0.124  1.0
  O  O16  1  0.283  0.108  0.436  1.0
  O  O17  1  0.783  0.892  0.064  1.0
  O  O18  1  0.717  0.892  0.564  1.0
  O  O19  1  0.217  0.108  0.936  1.0
  O  O20  1  0.031  0.513  0.323  1.0
  O  O21  1  0.531  0.487  0.177  1.0
  O  O22  1  0.969  0.487  0.677  1.0
  O  O23  1  0.469  0.513  0.823  1.0
[/CIF]
.