data_Na3Fe2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.67
_cell_length_b   7.67
_cell_length_c   7.67
_cell_angle_alpha   47.5
_cell_angle_beta   47.5
_cell_angle_gamma   47.5
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Na3Fe2
_chemical_formula_sum   'Na6 Fe4'
_cell_volume   224.67
_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  Na4  1  0.5  0.03  0.89  1.0
  Na  Na5  1  0.41  0.18  0.89  1.0
  Na  Na6  1  0.09  0.78  0.89  1.0
  Na  Na7  1  0.91  0.22  0.49  1.0
  Na  Na8  1  0.59  0.82  0.49  1.0
  Na  Na9  1  0.5  0.97  0.49  1.0
  Fe  Fe0  1  0.0  0.0  0.06  1.0
  Fe  Fe1  1  0.0  0.0  0.13  1.0
  Fe  Fe2  1  0.0  0.0  0.24  1.0
  Fe  Fe3  1  0.0  0.0  0.32  1.0

data_Na3Fe2
_symmetry_space_group_name_H-M   P-1
_cell_length_a   6.18
_cell_length_b   6.18
_cell_length_c   7.67
_cell_angle_alpha   66.25
_cell_angle_beta   66.25
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   Na3Fe2
_chemical_formula_sum   'Na6 Fe4'
_cell_volume   224.67
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-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  2  0.03  0.2  0.77  1.0
  Na  Na1  2  0.18  0.2  0.71  1.0
  Na  Na2  2  0.22  0.8  0.57  1.0
  Fe  Fe3  2  0.0  0.37  0.13  1.0
  Fe  Fe4  2  0.0  0.44  0.06  1.0

Na Na Na Na Na Na Fe Fe Fe Fe
(Na)2Fe2Na crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of two disodium molecules and one Fe2Na cluster. In the Fe2Na cluster, Na(3) is bonded in a single-bond geometry to one Fe(1) atom. The Na(3)-Fe(1) bond length is 2.27 Å. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a bent 150 degrees geometry to one Na(3) and one Fe(2) atom. The Fe(1)-Fe(2) bond length is 0.57 Å. In the second Fe site, Fe(2) is bonded in a linear geometry to one Fe(1) and one Fe(2) atom. The Fe(2)-Fe(2) bond length is 0.87 Å.