data_Na2FeOs
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.61
_cell_length_b   2.61
_cell_length_c   10.31
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   115.89
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Na2FeOs
_chemical_formula_sum   'Na2 Fe1 Os1'
_cell_volume   63.15
_cell_formula_units_Z   1
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  Na1  1  0.38  0.0  0.5  1.0
  Na  Na2  1  0.38  0.0  0.81  1.0
  Fe  Fe0  1  0.0  0.0  0.0  1.0
  Os  Os3  1  0.0  0.0  0.15  1.0

data_Na2FeOs
_symmetry_space_group_name_H-M   P1
_cell_length_a   2.61
_cell_length_b   2.61
_cell_length_c   10.31
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   115.89
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Na2FeOs
_chemical_formula_sum   'Na2 Fe1 Os1'
_cell_volume   63.15
_cell_formula_units_Z   1
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  0.38  0.0  0.5  1.0
  Na  Na1  1  0.38  0.0  0.81  1.0
  Fe  Fe2  1  0.0  0.0  0.0  1.0
  Os  Os3  1  0.0  0.0  0.15  1.0

Na Na Fe Os
Na2OsFe crystallizes in the triclinic P1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one Na(2), six equivalent Na(1), and one Os(1) atom to form a mixture of distorted edge and corner-sharing NaNa7Os hexagonal bipyramids. The Na(1)-Na(2) bond length is 3.16 Å. There are four shorter (2.61 Å) and two longer (2.77 Å) Na(1)-Na(1) bond lengths. The Na(1)-Os(1) bond length is 3.71 Å. In the second Na site, Na(2) is bonded in a 2-coordinate geometry to one Na(1) and two equivalent Fe(1) atoms. There is one shorter (2.22 Å) and one longer (2.55 Å) Na(2)-Fe(1) bond length. Os(1) is bonded in a single-bond geometry to one Na(1) and one Fe(1) atom. The Os(1)-Fe(1) bond length is 1.60 Å. Fe(1) is bonded in a 2-coordinate geometry to two equivalent Na(2) and one Os(1) atom.