The crystal structure described by Na4Co7(PO4)6 crystallizes in the monoclinic Cm space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to two equivalent O(11), two equivalent O(14), and two equivalent O(7) atoms. In the second Na site, Na(2) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(4), two equivalent O(5), and two equivalent O(8) atoms. In the third Na site, Na(3) is bonded to one O(1), one O(12), one O(13), one O(2), and one O(7) atom to form distorted NaO5 trigonal bipyramids that share  a cornercorner with one Co(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, corners with two equivalent Co(3)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra, and  an edgeedge with one Na(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 44-83°. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(10), one O(11), one O(13), one O(5), one O(8), and one O(9) atom to form CoO6 octahedra that share  a cornercorner with one Co(4)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent Co(3)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra,  a cornercorner with one Na(3)O5 trigonal bipyramid,  an edgeedge with one Co(2)O6 octahedra, and  an edgeedge with one P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles are 62°. In the second Co site, Co(2) is bonded to one O(10), one O(12), one O(14), one O(6), one O(7), and one O(9) atom to form CoO6 octahedra that share  a cornercorner with one Co(4)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, corners with two equivalent Co(3)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra, corners with two equivalent Na(3)O5 trigonal bipyramids,  an edgeedge with one Co(1)O6 octahedra, and  an edgeedge with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 59°. In the third Co site, Co(3) is bonded to one O(12), one O(13), one O(5), and one O(6) atom to form distorted CoO4 tetrahedra that share corners with two equivalent Co(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, and corners with two equivalent Na(3)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 72-76°. In the fourth Co site, Co(4) is bonded to one O(3), one O(4), two equivalent O(11), and two equivalent O(14) atoms to form CoO6 octahedra that share corners with two equivalent Co(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 59-62°. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(3), and two equivalent O(6) atoms to form PO4 tetrahedra that share  a cornercorner with one Co(4)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with two equivalent Co(3)O4 tetrahedra, and corners with two equivalent Na(3)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 40-55°. In the second P site, P(2) is bonded to one O(2), one O(4), and two equivalent O(5) atoms to form PO4 tetrahedra that share  a cornercorner with one Co(4)O6 octahedra, corners with two equivalent Co(1)O6 octahedra, corners with two equivalent Co(3)O4 tetrahedra, and corners with two equivalent Na(3)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 39-56°. In the third P site, P(3) is bonded to one O(10), one O(12), one O(14), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra, corners with two equivalent Co(1)O6 octahedra,  a cornercorner with one Co(3)O4 tetrahedra,  a cornercorner with one Na(3)O5 trigonal bipyramid, and  an edgeedge with one Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-56°. In the fourth P site, P(4) is bonded to one O(11), one O(13), one O(7), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra, corners with two equivalent Co(2)O6 octahedra,  a cornercorner with one Co(3)O4 tetrahedra, corners with two equivalent Na(3)O5 trigonal bipyramids, and  an edgeedge with one Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-55°. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Na(2), two equivalent Na(3), and one P(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Na(2), two equivalent Na(3), and one P(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Co(4) and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(2), one Co(4), and one P(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Na(2), one Co(1), one Co(3), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Co(2), one Co(3), and one P(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Na(1), one Na(3), one Co(2), and one P(4) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Na(2), one Co(1), and one P(3) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Co(1), one Co(2), and one P(4) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Co(1), one Co(2), and one P(3) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Na(1), one Co(1), one Co(4), and one P(4) atom. In the twelfth O site, O(12) is bonded to one Na(3), one Co(2), one Co(3), and one P(3) atom to form a mixture of distorted corner and edge-sharing ONaCo2P tetrahedra. In the thirteenth O site, O(13) is bonded to one Na(3), one Co(1), one Co(3), and one P(4) atom to form distorted corner-sharing ONaCo2P tetrahedra. In the fourteenth O site, O(14) is bonded to one Na(1), one Co(2), one Co(4), and one P(3) atom to form distorted edge-sharing ONaCo2P trigonal pyramids. is represented by the CIF file [CIF]
data_Na4Co7(PO4)6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.013
_cell_length_b   9.013
_cell_length_c   6.540
_cell_angle_alpha   80.726
_cell_angle_beta   80.726
_cell_angle_gamma   107.805
_symmetry_Int_Tables_number   1
_cell_volume   486.559
_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  0.059  0.059  0.480  1.0
  Na  Na1  1  0.676  0.676  0.558  1.0
  Na  Na2  1  0.520  0.291  0.511  1.0
  Na  Na3  1  0.291  0.520  0.511  1.0
  Co  Co4  1  0.997  0.640  0.818  1.0
  Co  Co5  1  0.640  0.997  0.818  1.0
  Co  Co6  1  0.357  0.984  0.184  1.0
  Co  Co7  1  0.984  0.357  0.184  1.0
  Co  Co8  1  0.652  0.337  0.998  1.0
  Co  Co9  1  0.337  0.652  0.998  1.0
  Co  Co10  1  0.995  0.995  0.004  1.0
  P  P11  1  0.321  0.321  0.943  1.0
  P  P12  1  0.667  0.667  0.077  1.0
  P  P13  1  0.080  0.714  0.290  1.0
  P  P14  1  0.714  0.080  0.290  1.0
  P  P15  1  0.278  0.903  0.711  1.0
  P  P16  1  0.903  0.278  0.711  1.0
  O  O17  1  0.442  0.442  0.749  1.0
  O  O18  1  0.548  0.548  0.273  1.0
  O  O19  1  0.195  0.195  0.874  1.0
  O  O20  1  0.795  0.795  0.140  1.0
  O  O21  1  0.747  0.576  0.928  1.0
  O  O22  1  0.576  0.747  0.928  1.0
  O  O23  1  0.414  0.238  0.085  1.0
  O  O24  1  0.238  0.414  0.085  1.0
  O  O25  1  0.342  0.016  0.490  1.0
  O  O26  1  0.016  0.342  0.490  1.0
  O  O27  1  0.972  0.650  0.513  1.0
  O  O28  1  0.650  0.972  0.513  1.0
  O  O29  1  0.387  0.966  0.864  1.0
  O  O30  1  0.966  0.387  0.864  1.0
  O  O31  1  0.016  0.607  0.136  1.0
  O  O32  1  0.607  0.016  0.136  1.0
  O  O33  1  0.098  0.888  0.784  1.0
  O  O34  1  0.260  0.720  0.271  1.0
  O  O35  1  0.720  0.260  0.271  1.0
  O  O36  1  0.268  0.724  0.726  1.0
  O  O37  1  0.724  0.268  0.726  1.0
  O  O38  1  0.897  0.104  0.220  1.0
  O  O39  1  0.104  0.897  0.220  1.0
  O  O40  1  0.888  0.098  0.784  1.0
[/CIF]
.
The crystal structure described by Na4Co7(PO4)6 crystallizes in the monoclinic Cm space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to two equivalent O(11), two equivalent O(14), and two equivalent O(7) atoms. In the second Na site, Na(2) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(4), two equivalent O(5), and two equivalent O(8) atoms. In the third Na site, Na(3) is bonded to one O(1), one O(12), one O(13), one O(2), and one O(7) atom to form distorted NaO5 trigonal bipyramids that share  a cornercorner with one Co(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, corners with two equivalent Co(3)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra, and  an edgeedge with one Na(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 44-83°. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(10), one O(11), one O(13), one O(5), one O(8), and one O(9) atom to form CoO6 octahedra that share  a cornercorner with one Co(4)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent Co(3)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra,  a cornercorner with one Na(3)O5 trigonal bipyramid,  an edgeedge with one Co(2)O6 octahedra, and  an edgeedge with one P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles are 62°. In the second Co site, Co(2) is bonded to one O(10), one O(12), one O(14), one O(6), one O(7), and one O(9) atom to form CoO6 octahedra that share  a cornercorner with one Co(4)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, corners with two equivalent Co(3)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra, corners with two equivalent Na(3)O5 trigonal bipyramids,  an edgeedge with one Co(1)O6 octahedra, and  an edgeedge with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 59°. In the third Co site, Co(3) is bonded to one O(12), one O(13), one O(5), and one O(6) atom to form distorted CoO4 tetrahedra that share corners with two equivalent Co(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, and corners with two equivalent Na(3)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 72-76°. In the fourth Co site, Co(4) is bonded to one O(3), one O(4), two equivalent O(11), and two equivalent O(14) atoms to form CoO6 octahedra that share corners with two equivalent Co(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 59-62°. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(3), and two equivalent O(6) atoms to form PO4 tetrahedra that share  a cornercorner with one Co(4)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with two equivalent Co(3)O4 tetrahedra, and corners with two equivalent Na(3)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 40-55°. In the second P site, P(2) is bonded to one O(2), one O(4), and two equivalent O(5) atoms to form PO4 tetrahedra that share  a cornercorner with one Co(4)O6 octahedra, corners with two equivalent Co(1)O6 octahedra, corners with two equivalent Co(3)O4 tetrahedra, and corners with two equivalent Na(3)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 39-56°. In the third P site, P(3) is bonded to one O(10), one O(12), one O(14), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra, corners with two equivalent Co(1)O6 octahedra,  a cornercorner with one Co(3)O4 tetrahedra,  a cornercorner with one Na(3)O5 trigonal bipyramid, and  an edgeedge with one Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-56°. In the fourth P site, P(4) is bonded to one O(11), one O(13), one O(7), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra, corners with two equivalent Co(2)O6 octahedra,  a cornercorner with one Co(3)O4 tetrahedra, corners with two equivalent Na(3)O5 trigonal bipyramids, and  an edgeedge with one Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-55°. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Na(2), two equivalent Na(3), and one P(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Na(2), two equivalent Na(3), and one P(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Co(4) and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(2), one Co(4), and one P(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Na(2), one Co(1), one Co(3), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Co(2), one Co(3), and one P(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Na(1), one Na(3), one Co(2), and one P(4) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Na(2), one Co(1), and one P(3) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Co(1), one Co(2), and one P(4) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Co(1), one Co(2), and one P(3) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Na(1), one Co(1), one Co(4), and one P(4) atom. In the twelfth O site, O(12) is bonded to one Na(3), one Co(2), one Co(3), and one P(3) atom to form a mixture of distorted corner and edge-sharing ONaCo2P tetrahedra. In the thirteenth O site, O(13) is bonded to one Na(3), one Co(1), one Co(3), and one P(4) atom to form distorted corner-sharing ONaCo2P tetrahedra. In the fourteenth O site, O(14) is bonded to one Na(1), one Co(2), one Co(4), and one P(3) atom to form distorted edge-sharing ONaCo2P trigonal pyramids. is represented by the CIF file [CIF]
data_Na4Co7(PO4)6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.013
_cell_length_b   9.013
_cell_length_c   6.540
_cell_angle_alpha   80.726
_cell_angle_beta   80.726
_cell_angle_gamma   107.805
_symmetry_Int_Tables_number   1
_cell_volume   486.559
_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  0.059  0.059  0.480  1.0
  Na  Na1  1  0.676  0.676  0.558  1.0
  Na  Na2  1  0.520  0.291  0.511  1.0
  Na  Na3  1  0.291  0.520  0.511  1.0
  Co  Co4  1  0.997  0.640  0.818  1.0
  Co  Co5  1  0.640  0.997  0.818  1.0
  Co  Co6  1  0.357  0.984  0.184  1.0
  Co  Co7  1  0.984  0.357  0.184  1.0
  Co  Co8  1  0.652  0.337  0.998  1.0
  Co  Co9  1  0.337  0.652  0.998  1.0
  Co  Co10  1  0.995  0.995  0.004  1.0
  P  P11  1  0.321  0.321  0.943  1.0
  P  P12  1  0.667  0.667  0.077  1.0
  P  P13  1  0.080  0.714  0.290  1.0
  P  P14  1  0.714  0.080  0.290  1.0
  P  P15  1  0.278  0.903  0.711  1.0
  P  P16  1  0.903  0.278  0.711  1.0
  O  O17  1  0.442  0.442  0.749  1.0
  O  O18  1  0.548  0.548  0.273  1.0
  O  O19  1  0.195  0.195  0.874  1.0
  O  O20  1  0.795  0.795  0.140  1.0
  O  O21  1  0.747  0.576  0.928  1.0
  O  O22  1  0.576  0.747  0.928  1.0
  O  O23  1  0.414  0.238  0.085  1.0
  O  O24  1  0.238  0.414  0.085  1.0
  O  O25  1  0.342  0.016  0.490  1.0
  O  O26  1  0.016  0.342  0.490  1.0
  O  O27  1  0.972  0.650  0.513  1.0
  O  O28  1  0.650  0.972  0.513  1.0
  O  O29  1  0.387  0.966  0.864  1.0
  O  O30  1  0.966  0.387  0.864  1.0
  O  O31  1  0.016  0.607  0.136  1.0
  O  O32  1  0.607  0.016  0.136  1.0
  O  O33  1  0.098  0.888  0.784  1.0
  O  O34  1  0.260  0.720  0.271  1.0
  O  O35  1  0.720  0.260  0.271  1.0
  O  O36  1  0.268  0.724  0.726  1.0
  O  O37  1  0.724  0.268  0.726  1.0
  O  O38  1  0.897  0.104  0.220  1.0
  O  O39  1  0.104  0.897  0.220  1.0
  O  O40  1  0.888  0.098  0.784  1.0
[/CIF]
.