The material structure described by Na2CO6 crystallizes in the monoclinic Cc space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(1), one O(11), one O(12), one O(2), one O(6), and one O(7) atom to form distorted corner-sharing NaO6 octahedra. The corner-sharing octahedral tilt angles range from 54-55°. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one O(1), one O(11), one O(12), one O(2), one O(5), and one O(8) atom. In the third Na site, Na(3) is bonded to one O(10), one O(3), one O(4), one O(5), one O(8), and one O(9) atom to form edge-sharing NaO6 octahedra. In the fourth Na site, Na(4) is bonded to one O(10), one O(3), one O(4), one O(6), one O(7), and one O(9) atom to form a mixture of corner and edge-sharing NaO6 octahedra. The corner-sharing octahedral tilt angles range from 54-55°. There are two inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(1), one O(3), and one O(9) atom. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(10), one O(2), and one O(4) atom. There are twelve inequivalent O sites. In the first O site, O(5) is bonded in a trigonal non-coplanar geometry to one Na(2), one Na(3), and one O(7) atom. In the second O site, O(6) is bonded in a trigonal non-coplanar geometry to one Na(1), one Na(4), and one O(8) atom. In the third O site, O(7) is bonded in a trigonal planar geometry to one Na(1), one Na(4), and one O(5) atom. In the fourth O site, O(8) is bonded in a trigonal non-coplanar geometry to one Na(2), one Na(3), and one O(6) atom. In the fifth O site, O(9) is bonded in a distorted trigonal planar geometry to one Na(3), one Na(4), and one C(1) atom. In the sixth O site, O(10) is bonded in a distorted trigonal planar geometry to one Na(3), one Na(4), and one C(2) atom. In the seventh O site, O(11) is bonded in a 3-coordinate geometry to one Na(1), one Na(2), and one O(12) atom. In the eighth O site, O(12) is bonded in a 3-coordinate geometry to one Na(1), one Na(2), and one O(11) atom. In the ninth O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Na(1), one Na(2), and one C(1) atom. In the tenth O site, O(2) is bonded in a distorted trigonal planar geometry to one Na(1), one Na(2), and one C(2) atom. In the eleventh O site, O(3) is bonded in a 3-coordinate geometry to one Na(3), one Na(4), and one C(1) atom. In the twelfth O site, O(4) is bonded in a 3-coordinate geometry to one Na(3), one Na(4), and one C(2) atom. is represented by the CIF file [CIF]
data_Na2CO6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.739
_cell_length_b   8.739
_cell_length_c   9.463
_cell_angle_alpha   89.597
_cell_angle_beta   89.597
_cell_angle_gamma   133.256
_symmetry_Int_Tables_number   1
_cell_volume   526.295
_cell_formula_units_Z   4
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  0.779  0.278  0.248  1.0
  Na  Na1  1  0.777  0.277  0.742  1.0
  Na  Na2  1  0.277  0.777  0.242  1.0
  Na  Na3  1  0.278  0.779  0.748  1.0
  Na  Na4  1  0.520  0.520  0.501  1.0
  Na  Na5  1  0.025  0.020  0.502  1.0
  Na  Na6  1  0.020  0.025  0.002  1.0
  Na  Na7  1  0.520  0.520  0.001  1.0
  C  C8  1  0.362  0.183  0.250  1.0
  C  C9  1  0.685  0.860  0.750  1.0
  C  C10  1  0.860  0.685  0.250  1.0
  C  C11  1  0.183  0.362  0.750  1.0
  O  O12  1  0.440  0.111  0.301  1.0
  O  O13  1  0.615  0.940  0.695  1.0
  O  O14  1  0.940  0.615  0.195  1.0
  O  O15  1  0.111  0.440  0.801  1.0
  O  O16  1  0.345  0.187  0.114  1.0
  O  O17  1  0.693  0.849  0.885  1.0
  O  O18  1  0.849  0.693  0.385  1.0
  O  O19  1  0.187  0.345  0.614  1.0
  O  O20  1  0.486  0.243  0.655  1.0
  O  O21  1  0.734  0.976  0.346  1.0
  O  O22  1  0.976  0.734  0.846  1.0
  O  O23  1  0.243  0.486  0.155  1.0
  O  O24  1  0.330  0.062  0.608  1.0
  O  O25  1  0.550  0.826  0.392  1.0
  O  O26  1  0.826  0.550  0.892  1.0
  O  O27  1  0.062  0.330  0.108  1.0
  O  O28  1  0.301  0.249  0.333  1.0
  O  O29  1  0.745  0.792  0.668  1.0
  O  O30  1  0.792  0.745  0.168  1.0
  O  O31  1  0.249  0.301  0.833  1.0
  O  O32  1  0.465  0.023  0.957  1.0
  O  O33  1  0.023  0.465  0.457  1.0
  O  O34  1  0.632  0.094  0.015  1.0
  O  O35  1  0.094  0.632  0.515  1.0
[/CIF]
.
The material structure described by Na2CO6 crystallizes in the monoclinic Cc space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(1), one O(11), one O(12), one O(2), one O(6), and one O(7) atom to form distorted corner-sharing NaO6 octahedra. The corner-sharing octahedral tilt angles range from 54-55°. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one O(1), one O(11), one O(12), one O(2), one O(5), and one O(8) atom. In the third Na site, Na(3) is bonded to one O(10), one O(3), one O(4), one O(5), one O(8), and one O(9) atom to form edge-sharing NaO6 octahedra. In the fourth Na site, Na(4) is bonded to one O(10), one O(3), one O(4), one O(6), one O(7), and one O(9) atom to form a mixture of corner and edge-sharing NaO6 octahedra. The corner-sharing octahedral tilt angles range from 54-55°. There are two inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(1), one O(3), and one O(9) atom. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(10), one O(2), and one O(4) atom. There are twelve inequivalent O sites. In the first O site, O(5) is bonded in a trigonal non-coplanar geometry to one Na(2), one Na(3), and one O(7) atom. In the second O site, O(6) is bonded in a trigonal non-coplanar geometry to one Na(1), one Na(4), and one O(8) atom. In the third O site, O(7) is bonded in a trigonal planar geometry to one Na(1), one Na(4), and one O(5) atom. In the fourth O site, O(8) is bonded in a trigonal non-coplanar geometry to one Na(2), one Na(3), and one O(6) atom. In the fifth O site, O(9) is bonded in a distorted trigonal planar geometry to one Na(3), one Na(4), and one C(1) atom. In the sixth O site, O(10) is bonded in a distorted trigonal planar geometry to one Na(3), one Na(4), and one C(2) atom. In the seventh O site, O(11) is bonded in a 3-coordinate geometry to one Na(1), one Na(2), and one O(12) atom. In the eighth O site, O(12) is bonded in a 3-coordinate geometry to one Na(1), one Na(2), and one O(11) atom. In the ninth O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Na(1), one Na(2), and one C(1) atom. In the tenth O site, O(2) is bonded in a distorted trigonal planar geometry to one Na(1), one Na(2), and one C(2) atom. In the eleventh O site, O(3) is bonded in a 3-coordinate geometry to one Na(3), one Na(4), and one C(1) atom. In the twelfth O site, O(4) is bonded in a 3-coordinate geometry to one Na(3), one Na(4), and one C(2) atom. is represented by the CIF file [CIF]
data_Na2CO6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.739
_cell_length_b   8.739
_cell_length_c   9.463
_cell_angle_alpha   89.597
_cell_angle_beta   89.597
_cell_angle_gamma   133.256
_symmetry_Int_Tables_number   1
_cell_volume   526.295
_cell_formula_units_Z   4
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  0.779  0.278  0.248  1.0
  Na  Na1  1  0.777  0.277  0.742  1.0
  Na  Na2  1  0.277  0.777  0.242  1.0
  Na  Na3  1  0.278  0.779  0.748  1.0
  Na  Na4  1  0.520  0.520  0.501  1.0
  Na  Na5  1  0.025  0.020  0.502  1.0
  Na  Na6  1  0.020  0.025  0.002  1.0
  Na  Na7  1  0.520  0.520  0.001  1.0
  C  C8  1  0.362  0.183  0.250  1.0
  C  C9  1  0.685  0.860  0.750  1.0
  C  C10  1  0.860  0.685  0.250  1.0
  C  C11  1  0.183  0.362  0.750  1.0
  O  O12  1  0.440  0.111  0.301  1.0
  O  O13  1  0.615  0.940  0.695  1.0
  O  O14  1  0.940  0.615  0.195  1.0
  O  O15  1  0.111  0.440  0.801  1.0
  O  O16  1  0.345  0.187  0.114  1.0
  O  O17  1  0.693  0.849  0.885  1.0
  O  O18  1  0.849  0.693  0.385  1.0
  O  O19  1  0.187  0.345  0.614  1.0
  O  O20  1  0.486  0.243  0.655  1.0
  O  O21  1  0.734  0.976  0.346  1.0
  O  O22  1  0.976  0.734  0.846  1.0
  O  O23  1  0.243  0.486  0.155  1.0
  O  O24  1  0.330  0.062  0.608  1.0
  O  O25  1  0.550  0.826  0.392  1.0
  O  O26  1  0.826  0.550  0.892  1.0
  O  O27  1  0.062  0.330  0.108  1.0
  O  O28  1  0.301  0.249  0.333  1.0
  O  O29  1  0.745  0.792  0.668  1.0
  O  O30  1  0.792  0.745  0.168  1.0
  O  O31  1  0.249  0.301  0.833  1.0
  O  O32  1  0.465  0.023  0.957  1.0
  O  O33  1  0.023  0.465  0.457  1.0
  O  O34  1  0.632  0.094  0.015  1.0
  O  O35  1  0.094  0.632  0.515  1.0
[/CIF]
.