The crystal structure described by Na3(CO4)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form edge-sharing NaO6 octahedra. In the second Na site, Na(2) is bonded in a 7-coordinate geometry to one O(2), one O(3), two equivalent O(1), and three equivalent O(4) atoms. C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. There are four inequivalent O sites. In the first O site, O(4) is bonded to three equivalent Na(2) and one O(1) atom to form a mixture of distorted corner and edge-sharing ONa3O trigonal pyramids. In the second O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Na(2), one C(1), and one O(4) atom. In the third O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one Na(2), and one C(1) atom. In the fourth O site, O(3) is bonded in a 4-coordinate geometry to one Na(2), two equivalent Na(1), and one C(1) atom. is represented by the CIF card [CIF]
data_Na3(CO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.762
_cell_length_b   10.762
_cell_length_c   9.830
_cell_angle_alpha   65.719
_cell_angle_beta   65.719
_cell_angle_gamma   18.848
_symmetry_Int_Tables_number   1
_cell_volume   334.321
_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  0.190  0.810  0.750  1.0
  Na  Na1  1  0.810  0.190  0.250  1.0
  Na  Na2  1  0.095  0.251  0.641  1.0
  Na  Na3  1  0.749  0.905  0.859  1.0
  Na  Na4  1  0.905  0.749  0.359  1.0
  Na  Na5  1  0.251  0.095  0.141  1.0
  C  C6  1  0.801  0.401  0.443  1.0
  C  C7  1  0.599  0.199  0.057  1.0
  C  C8  1  0.199  0.599  0.557  1.0
  C  C9  1  0.401  0.801  0.943  1.0
  O  O10  1  0.715  0.627  0.360  1.0
  O  O11  1  0.373  0.285  0.140  1.0
  O  O12  1  0.285  0.373  0.640  1.0
  O  O13  1  0.627  0.715  0.860  1.0
  O  O14  1  0.904  0.255  0.352  1.0
  O  O15  1  0.745  0.096  0.148  1.0
  O  O16  1  0.096  0.745  0.648  1.0
  O  O17  1  0.255  0.904  0.852  1.0
  O  O18  1  0.769  0.384  0.582  1.0
  O  O19  1  0.616  0.231  0.918  1.0
  O  O20  1  0.231  0.616  0.418  1.0
  O  O21  1  0.384  0.769  0.082  1.0
  O  O22  1  0.644  0.767  0.448  1.0
  O  O23  1  0.233  0.356  0.052  1.0
  O  O24  1  0.356  0.233  0.552  1.0
  O  O25  1  0.767  0.644  0.948  1.0
[/CIF]
.
The crystal structure described by Na3(CO4)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form edge-sharing NaO6 octahedra. In the second Na site, Na(2) is bonded in a 7-coordinate geometry to one O(2), one O(3), two equivalent O(1), and three equivalent O(4) atoms. C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. There are four inequivalent O sites. In the first O site, O(4) is bonded to three equivalent Na(2) and one O(1) atom to form a mixture of distorted corner and edge-sharing ONa3O trigonal pyramids. In the second O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Na(2), one C(1), and one O(4) atom. In the third O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one Na(2), and one C(1) atom. In the fourth O site, O(3) is bonded in a 4-coordinate geometry to one Na(2), two equivalent Na(1), and one C(1) atom. is represented by the CIF card [CIF]
data_Na3(CO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.762
_cell_length_b   10.762
_cell_length_c   9.830
_cell_angle_alpha   65.719
_cell_angle_beta   65.719
_cell_angle_gamma   18.848
_symmetry_Int_Tables_number   1
_cell_volume   334.321
_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  0.190  0.810  0.750  1.0
  Na  Na1  1  0.810  0.190  0.250  1.0
  Na  Na2  1  0.095  0.251  0.641  1.0
  Na  Na3  1  0.749  0.905  0.859  1.0
  Na  Na4  1  0.905  0.749  0.359  1.0
  Na  Na5  1  0.251  0.095  0.141  1.0
  C  C6  1  0.801  0.401  0.443  1.0
  C  C7  1  0.599  0.199  0.057  1.0
  C  C8  1  0.199  0.599  0.557  1.0
  C  C9  1  0.401  0.801  0.943  1.0
  O  O10  1  0.715  0.627  0.360  1.0
  O  O11  1  0.373  0.285  0.140  1.0
  O  O12  1  0.285  0.373  0.640  1.0
  O  O13  1  0.627  0.715  0.860  1.0
  O  O14  1  0.904  0.255  0.352  1.0
  O  O15  1  0.745  0.096  0.148  1.0
  O  O16  1  0.096  0.745  0.648  1.0
  O  O17  1  0.255  0.904  0.852  1.0
  O  O18  1  0.769  0.384  0.582  1.0
  O  O19  1  0.616  0.231  0.918  1.0
  O  O20  1  0.231  0.616  0.418  1.0
  O  O21  1  0.384  0.769  0.082  1.0
  O  O22  1  0.644  0.767  0.448  1.0
  O  O23  1  0.233  0.356  0.052  1.0
  O  O24  1  0.356  0.233  0.552  1.0
  O  O25  1  0.767  0.644  0.948  1.0
[/CIF]
.