The material described by Na2Co6O7 crystallizes in the tetragonal P4_2nm space group. Na(1) is bonded in a 1-coordinate geometry to one O(1) and four equivalent O(2) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(3) and three equivalent O(2) atoms to form corner-sharing CoO4 tetrahedra. In the second Co site, Co(2) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(2), and two equivalent O(3) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Na(1) and two equivalent Co(2) atoms. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Na(1), one Co(2), and three equivalent Co(1) atoms. In the third O site, O(3) is bonded in a distorted see-saw-like geometry to two equivalent Co(1) and two equivalent Co(2) atoms. is represented by the CIF card [CIF]
data_Na2Co6O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.856
_cell_length_b   10.856
_cell_length_c   3.248
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   382.795
_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  0.361  0.639  0.985  1.0
  Na  Na1  1  0.861  0.861  0.485  1.0
  Na  Na2  1  0.139  0.139  0.485  1.0
  Na  Na3  1  0.639  0.361  0.985  1.0
  Co  Co4  1  0.845  0.587  0.988  1.0
  Co  Co5  1  0.619  0.619  0.497  1.0
  Co  Co6  1  0.087  0.655  0.488  1.0
  Co  Co7  1  0.587  0.845  0.988  1.0
  Co  Co8  1  0.119  0.881  0.997  1.0
  Co  Co9  1  0.345  0.913  0.488  1.0
  Co  Co10  1  0.655  0.087  0.488  1.0
  Co  Co11  1  0.881  0.119  0.997  1.0
  Co  Co12  1  0.413  0.155  0.988  1.0
  Co  Co13  1  0.913  0.345  0.488  1.0
  Co  Co14  1  0.381  0.381  0.497  1.0
  Co  Co15  1  0.155  0.413  0.988  1.0
  O  O16  1  0.500  0.500  0.636  1.0
  O  O17  1  0.196  0.510  0.488  1.0
  O  O18  1  0.990  0.696  0.988  1.0
  O  O19  1  0.696  0.696  0.003  1.0
  O  O20  1  0.196  0.804  0.503  1.0
  O  O21  1  0.490  0.804  0.488  1.0
  O  O22  1  0.696  0.990  0.988  1.0
  O  O23  1  0.000  0.000  0.136  1.0
  O  O24  1  0.304  0.010  0.988  1.0
  O  O25  1  0.510  0.196  0.488  1.0
  O  O26  1  0.804  0.196  0.503  1.0
  O  O27  1  0.304  0.304  0.003  1.0
  O  O28  1  0.010  0.304  0.988  1.0
  O  O29  1  0.804  0.490  0.488  1.0
[/CIF]
.
The material described by Na2Co6O7 crystallizes in the tetragonal P4_2nm space group. Na(1) is bonded in a 1-coordinate geometry to one O(1) and four equivalent O(2) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(3) and three equivalent O(2) atoms to form corner-sharing CoO4 tetrahedra. In the second Co site, Co(2) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(2), and two equivalent O(3) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Na(1) and two equivalent Co(2) atoms. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Na(1), one Co(2), and three equivalent Co(1) atoms. In the third O site, O(3) is bonded in a distorted see-saw-like geometry to two equivalent Co(1) and two equivalent Co(2) atoms. is represented by the CIF card [CIF]
data_Na2Co6O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.856
_cell_length_b   10.856
_cell_length_c   3.248
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   382.795
_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  0.361  0.639  0.985  1.0
  Na  Na1  1  0.861  0.861  0.485  1.0
  Na  Na2  1  0.139  0.139  0.485  1.0
  Na  Na3  1  0.639  0.361  0.985  1.0
  Co  Co4  1  0.845  0.587  0.988  1.0
  Co  Co5  1  0.619  0.619  0.497  1.0
  Co  Co6  1  0.087  0.655  0.488  1.0
  Co  Co7  1  0.587  0.845  0.988  1.0
  Co  Co8  1  0.119  0.881  0.997  1.0
  Co  Co9  1  0.345  0.913  0.488  1.0
  Co  Co10  1  0.655  0.087  0.488  1.0
  Co  Co11  1  0.881  0.119  0.997  1.0
  Co  Co12  1  0.413  0.155  0.988  1.0
  Co  Co13  1  0.913  0.345  0.488  1.0
  Co  Co14  1  0.381  0.381  0.497  1.0
  Co  Co15  1  0.155  0.413  0.988  1.0
  O  O16  1  0.500  0.500  0.636  1.0
  O  O17  1  0.196  0.510  0.488  1.0
  O  O18  1  0.990  0.696  0.988  1.0
  O  O19  1  0.696  0.696  0.003  1.0
  O  O20  1  0.196  0.804  0.503  1.0
  O  O21  1  0.490  0.804  0.488  1.0
  O  O22  1  0.696  0.990  0.988  1.0
  O  O23  1  0.000  0.000  0.136  1.0
  O  O24  1  0.304  0.010  0.988  1.0
  O  O25  1  0.510  0.196  0.488  1.0
  O  O26  1  0.804  0.196  0.503  1.0
  O  O27  1  0.304  0.304  0.003  1.0
  O  O28  1  0.010  0.304  0.988  1.0
  O  O29  1  0.804  0.490  0.488  1.0
[/CIF]
.