The material structure described by Na4MgCr2O8 crystallizes in the triclinic P-1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(2), one O(3), one O(4), and two equivalent O(1) atoms to form distorted edge-sharing NaO5 trigonal bipyramids. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(3), and two equivalent O(4) atoms. Mg(1) is bonded in a 6-coordinate geometry to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Cr(1) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Na(1) and one Cr(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Mg(1), and one Cr(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Na(1), two equivalent Na(2), one Mg(1), and one Cr(1) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Na(1), two equivalent Na(2), one Mg(1), and one Cr(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na4MgCr2O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.817
_cell_length_b   6.057
_cell_length_c   5.761
_cell_angle_alpha   60.402
_cell_angle_beta   106.963
_cell_angle_gamma   101.541
_symmetry_Int_Tables_number   1
_cell_volume   255.297
_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  0.174  0.213  0.507  1.0
  Na  Na1  1  0.423  0.801  0.366  1.0
  Na  Na2  1  0.577  0.199  0.634  1.0
  Na  Na3  1  0.826  0.787  0.493  1.0
  Mg  Mg4  1  0.500  0.500  0.000  1.0
  Cr  Cr5  1  0.230  0.637  0.864  1.0
  Cr  Cr6  1  0.770  0.363  0.136  1.0
  O  O7  1  0.071  0.788  0.789  1.0
  O  O8  1  0.247  0.423  0.764  1.0
  O  O9  1  0.390  0.858  0.735  1.0
  O  O10  1  0.344  0.495  0.213  1.0
  O  O11  1  0.656  0.505  0.787  1.0
  O  O12  1  0.610  0.142  0.265  1.0
  O  O13  1  0.753  0.577  0.236  1.0
  O  O14  1  0.929  0.212  0.211  1.0
[/CIF]
.
The material structure described by Na4MgCr2O8 crystallizes in the triclinic P-1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(2), one O(3), one O(4), and two equivalent O(1) atoms to form distorted edge-sharing NaO5 trigonal bipyramids. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(3), and two equivalent O(4) atoms. Mg(1) is bonded in a 6-coordinate geometry to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Cr(1) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Na(1) and one Cr(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Mg(1), and one Cr(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Na(1), two equivalent Na(2), one Mg(1), and one Cr(1) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Na(1), two equivalent Na(2), one Mg(1), and one Cr(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na4MgCr2O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.817
_cell_length_b   6.057
_cell_length_c   5.761
_cell_angle_alpha   60.402
_cell_angle_beta   106.963
_cell_angle_gamma   101.541
_symmetry_Int_Tables_number   1
_cell_volume   255.297
_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  0.174  0.213  0.507  1.0
  Na  Na1  1  0.423  0.801  0.366  1.0
  Na  Na2  1  0.577  0.199  0.634  1.0
  Na  Na3  1  0.826  0.787  0.493  1.0
  Mg  Mg4  1  0.500  0.500  0.000  1.0
  Cr  Cr5  1  0.230  0.637  0.864  1.0
  Cr  Cr6  1  0.770  0.363  0.136  1.0
  O  O7  1  0.071  0.788  0.789  1.0
  O  O8  1  0.247  0.423  0.764  1.0
  O  O9  1  0.390  0.858  0.735  1.0
  O  O10  1  0.344  0.495  0.213  1.0
  O  O11  1  0.656  0.505  0.787  1.0
  O  O12  1  0.610  0.142  0.265  1.0
  O  O13  1  0.753  0.577  0.236  1.0
  O  O14  1  0.929  0.212  0.211  1.0
[/CIF]
.