The material structure described by Na2OsO4 crystallizes in the hexagonal P-62m space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded to six equivalent O(1) atoms to form distorted NaO6 pentagonal pyramids that share corners with six equivalent Os(1)O6 octahedra, edges with three equivalent Os(1)O6 octahedra, and faces with two equivalent Na(1)O6 pentagonal pyramids. The corner-sharing octahedral tilt angles are 10°. In the second Na site, Na(2) is bonded in a 9-coordinate geometry to three equivalent O(2) and six equivalent O(3) atoms. In the third Na site, Na(3) is bonded in a 7-coordinate geometry to one O(2), two equivalent O(1), and four equivalent O(3) atoms. Os(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form OsO6 octahedra that share corners with two equivalent Na(1)O6 pentagonal pyramids, edges with two equivalent Os(1)O6 octahedra, and  an edgeedge with one Na(1)O6 pentagonal pyramid. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Na(1), two equivalent Na(3), and two equivalent Os(1) atoms to form ONa4Os2 octahedra that share corners with four equivalent O(1)Na4Os2 octahedra, corners with four equivalent O(2)Na3Os2 trigonal bipyramids, edges with two equivalent O(1)Na4Os2 octahedra,  an edgeedge with one O(2)Na3Os2 trigonal bipyramid, and faces with two equivalent O(1)Na4Os2 octahedra. The corner-sharing octahedral tilt angles are 44°. In the second O site, O(2) is bonded to one Na(3), two equivalent Na(2), and two equivalent Os(1) atoms to form distorted ONa3Os2 trigonal bipyramids that share corners with four equivalent O(1)Na4Os2 octahedra, corners with six equivalent O(2)Na3Os2 trigonal bipyramids, and  an edgeedge with one O(1)Na4Os2 octahedra. The corner-sharing octahedral tilt angles range from 2-38°. In the third O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Na(2), two equivalent Na(3), and one Os(1) atom. is represented by the CIF file [CIF]
data_Na2OsO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.473
_cell_length_b   9.473
_cell_length_c   3.170
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.003
_symmetry_Int_Tables_number   1
_cell_volume   246.362
_cell_formula_units_Z   3
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  1.000  1.0
  Na  Na1  1  0.667  0.333  0.500  1.0
  Na  Na2  1  0.333  0.667  0.500  1.0
  Na  Na3  1  0.306  0.306  0.500  1.0
  Na  Na4  1  0.694  0.000  0.500  1.0
  Na  Na5  1  1.000  0.694  0.500  1.0
  Os  Os6  1  0.671  0.671  0.000  1.0
  Os  Os7  1  0.329  1.000  0.000  1.0
  Os  Os8  1  0.000  0.329  0.000  1.0
  O  O9  1  0.808  0.808  0.500  1.0
  O  O10  1  0.192  1.000  0.500  1.0
  O  O11  1  0.000  0.192  0.500  1.0
  O  O12  1  0.542  0.542  0.500  1.0
  O  O13  1  0.458  0.000  0.500  1.0
  O  O14  1  0.000  0.458  0.500  1.0
  O  O15  1  0.567  0.785  1.000  1.0
  O  O16  1  0.215  0.781  1.000  1.0
  O  O17  1  0.219  0.433  1.000  1.0
  O  O18  1  0.785  0.567  1.000  1.0
  O  O19  1  0.781  0.215  1.000  1.0
  O  O20  1  0.433  0.219  1.000  1.0
[/CIF]
.
The material structure described by Na2OsO4 crystallizes in the hexagonal P-62m space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded to six equivalent O(1) atoms to form distorted NaO6 pentagonal pyramids that share corners with six equivalent Os(1)O6 octahedra, edges with three equivalent Os(1)O6 octahedra, and faces with two equivalent Na(1)O6 pentagonal pyramids. The corner-sharing octahedral tilt angles are 10°. In the second Na site, Na(2) is bonded in a 9-coordinate geometry to three equivalent O(2) and six equivalent O(3) atoms. In the third Na site, Na(3) is bonded in a 7-coordinate geometry to one O(2), two equivalent O(1), and four equivalent O(3) atoms. Os(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form OsO6 octahedra that share corners with two equivalent Na(1)O6 pentagonal pyramids, edges with two equivalent Os(1)O6 octahedra, and  an edgeedge with one Na(1)O6 pentagonal pyramid. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Na(1), two equivalent Na(3), and two equivalent Os(1) atoms to form ONa4Os2 octahedra that share corners with four equivalent O(1)Na4Os2 octahedra, corners with four equivalent O(2)Na3Os2 trigonal bipyramids, edges with two equivalent O(1)Na4Os2 octahedra,  an edgeedge with one O(2)Na3Os2 trigonal bipyramid, and faces with two equivalent O(1)Na4Os2 octahedra. The corner-sharing octahedral tilt angles are 44°. In the second O site, O(2) is bonded to one Na(3), two equivalent Na(2), and two equivalent Os(1) atoms to form distorted ONa3Os2 trigonal bipyramids that share corners with four equivalent O(1)Na4Os2 octahedra, corners with six equivalent O(2)Na3Os2 trigonal bipyramids, and  an edgeedge with one O(1)Na4Os2 octahedra. The corner-sharing octahedral tilt angles range from 2-38°. In the third O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Na(2), two equivalent Na(3), and one Os(1) atom. is represented by the CIF file [CIF]
data_Na2OsO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.473
_cell_length_b   9.473
_cell_length_c   3.170
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.003
_symmetry_Int_Tables_number   1
_cell_volume   246.362
_cell_formula_units_Z   3
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  1.000  1.0
  Na  Na1  1  0.667  0.333  0.500  1.0
  Na  Na2  1  0.333  0.667  0.500  1.0
  Na  Na3  1  0.306  0.306  0.500  1.0
  Na  Na4  1  0.694  0.000  0.500  1.0
  Na  Na5  1  1.000  0.694  0.500  1.0
  Os  Os6  1  0.671  0.671  0.000  1.0
  Os  Os7  1  0.329  1.000  0.000  1.0
  Os  Os8  1  0.000  0.329  0.000  1.0
  O  O9  1  0.808  0.808  0.500  1.0
  O  O10  1  0.192  1.000  0.500  1.0
  O  O11  1  0.000  0.192  0.500  1.0
  O  O12  1  0.542  0.542  0.500  1.0
  O  O13  1  0.458  0.000  0.500  1.0
  O  O14  1  0.000  0.458  0.500  1.0
  O  O15  1  0.567  0.785  1.000  1.0
  O  O16  1  0.215  0.781  1.000  1.0
  O  O17  1  0.219  0.433  1.000  1.0
  O  O18  1  0.785  0.567  1.000  1.0
  O  O19  1  0.781  0.215  1.000  1.0
  O  O20  1  0.433  0.219  1.000  1.0
[/CIF]
.