The compound 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 in a distorted see-saw-like geometry to three equivalent Na(2) and one O(4) atom. In the second O site, O(1) is bonded in a 2-coordinate geometry to two equivalent Na(2) and one C(1) atom. In the third O site, O(2) is bonded in a distorted T-shaped 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 file [CIF]
data_Na3(CO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.574
_cell_length_b   11.574
_cell_length_c   9.512
_cell_angle_alpha   74.671
_cell_angle_beta   74.671
_cell_angle_gamma   18.384
_symmetry_Int_Tables_number   1
_cell_volume   387.149
_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  0.798  0.202  0.250  1.0
  Na  Na1  1  0.202  0.798  0.750  1.0
  Na  Na2  1  0.011  0.689  0.428  1.0
  Na  Na3  1  0.311  0.989  0.072  1.0
  Na  Na4  1  0.989  0.311  0.572  1.0
  Na  Na5  1  0.689  0.011  0.928  1.0
  C  C6  1  0.202  0.607  0.108  1.0
  C  C7  1  0.393  0.798  0.392  1.0
  C  C8  1  0.798  0.393  0.892  1.0
  C  C9  1  0.607  0.202  0.608  1.0
  O  O10  1  0.282  0.421  0.115  1.0
  O  O11  1  0.579  0.718  0.385  1.0
  O  O12  1  0.718  0.579  0.885  1.0
  O  O13  1  0.421  0.282  0.615  1.0
  O  O14  1  0.078  0.790  0.989  1.0
  O  O15  1  0.210  0.922  0.511  1.0
  O  O16  1  0.922  0.210  0.011  1.0
  O  O17  1  0.790  0.078  0.489  1.0
  O  O18  1  0.233  0.620  0.220  1.0
  O  O19  1  0.380  0.767  0.280  1.0
  O  O20  1  0.767  0.380  0.780  1.0
  O  O21  1  0.620  0.233  0.720  1.0
  O  O22  1  0.402  0.121  0.449  1.0
  O  O23  1  0.879  0.598  0.051  1.0
  O  O24  1  0.598  0.879  0.551  1.0
  O  O25  1  0.121  0.402  0.949  1.0
[/CIF]
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The compound 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 in a distorted see-saw-like geometry to three equivalent Na(2) and one O(4) atom. In the second O site, O(1) is bonded in a 2-coordinate geometry to two equivalent Na(2) and one C(1) atom. In the third O site, O(2) is bonded in a distorted T-shaped 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 file [CIF]
data_Na3(CO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.574
_cell_length_b   11.574
_cell_length_c   9.512
_cell_angle_alpha   74.671
_cell_angle_beta   74.671
_cell_angle_gamma   18.384
_symmetry_Int_Tables_number   1
_cell_volume   387.149
_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  0.798  0.202  0.250  1.0
  Na  Na1  1  0.202  0.798  0.750  1.0
  Na  Na2  1  0.011  0.689  0.428  1.0
  Na  Na3  1  0.311  0.989  0.072  1.0
  Na  Na4  1  0.989  0.311  0.572  1.0
  Na  Na5  1  0.689  0.011  0.928  1.0
  C  C6  1  0.202  0.607  0.108  1.0
  C  C7  1  0.393  0.798  0.392  1.0
  C  C8  1  0.798  0.393  0.892  1.0
  C  C9  1  0.607  0.202  0.608  1.0
  O  O10  1  0.282  0.421  0.115  1.0
  O  O11  1  0.579  0.718  0.385  1.0
  O  O12  1  0.718  0.579  0.885  1.0
  O  O13  1  0.421  0.282  0.615  1.0
  O  O14  1  0.078  0.790  0.989  1.0
  O  O15  1  0.210  0.922  0.511  1.0
  O  O16  1  0.922  0.210  0.011  1.0
  O  O17  1  0.790  0.078  0.489  1.0
  O  O18  1  0.233  0.620  0.220  1.0
  O  O19  1  0.380  0.767  0.280  1.0
  O  O20  1  0.767  0.380  0.780  1.0
  O  O21  1  0.620  0.233  0.720  1.0
  O  O22  1  0.402  0.121  0.449  1.0
  O  O23  1  0.879  0.598  0.051  1.0
  O  O24  1  0.598  0.879  0.551  1.0
  O  O25  1  0.121  0.402  0.949  1.0
[/CIF]
.