The material structure described by Na5Mn7O16 crystallizes in the monoclinic C2/m space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to one O(3), one O(4), and two equivalent O(6) atoms. In the second Na site, Na(2) is bonded to one O(2), one O(5), and two equivalent O(1) atoms to form distorted NaO4 tetrahedra that share corners with three equivalent Mn(1)O6 octahedra, corners with three equivalent Mn(3)O6 octahedra, and corners with six equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-72°. In the third Na site, Na(3) is bonded in a 6-coordinate geometry to two equivalent O(3) and four equivalent O(6) atoms. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form MnO6 octahedra that share corners with six equivalent Na(2)O4 tetrahedra, edges with two equivalent Mn(3)O6 octahedra, and edges with four equivalent Mn(2)O6 octahedra. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form MnO6 octahedra that share corners with three equivalent Na(2)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with two equivalent Mn(3)O6 octahedra. In the third Mn site, Mn(3) is bonded to one O(3), one O(5), two equivalent O(1), and two equivalent O(6) atoms to form distorted MnO6 octahedra that share corners with three equivalent Na(2)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra, and edges with four equivalent Mn(2)O6 octahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Na(2), one Mn(1), one Mn(2), and one Mn(3) atom to form ONaMn3 tetrahedra that share corners with two equivalent O(2)NaMn3 tetrahedra, corners with three equivalent O(1)NaMn3 tetrahedra,  an edgeedge with one O(1)NaMn3 tetrahedra,  an edgeedge with one O(2)NaMn3 tetrahedra, and  an edgeedge with one O(3)Na2Mn3 trigonal bipyramid. In the second O site, O(2) is bonded to one Na(2), one Mn(1), and two equivalent Mn(2) atoms to form ONaMn3 tetrahedra that share  a cornercorner with one O(2)NaMn3 tetrahedra, corners with four equivalent O(1)NaMn3 tetrahedra, edges with two equivalent O(1)NaMn3 tetrahedra, and  an edgeedge with one O(3)Na2Mn3 trigonal bipyramid. In the third O site, O(3) is bonded to one Na(1), one Na(3), one Mn(3), and two equivalent Mn(2) atoms to form distorted ONa2Mn3 trigonal bipyramids that share  a cornercorner with one O(3)Na2Mn3 trigonal bipyramid,  an edgeedge with one O(2)NaMn3 tetrahedra, and edges with two equivalent O(1)NaMn3 tetrahedra. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Na(1) and two equivalent Mn(2) atoms. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Na(2), one Mn(3), and two equivalent Mn(2) atoms. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Na(1), one Na(3), one Mn(2), and one Mn(3) atom. is represented by the CIF card [CIF]
data_Na5Mn7O16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.198
_cell_length_b   6.198
_cell_length_c   10.707
_cell_angle_alpha   74.926
_cell_angle_beta   74.926
_cell_angle_gamma   56.870
_symmetry_Int_Tables_number   1
_cell_volume   329.084
_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  0.763  0.763  0.563  1.0
  Na  Na1  1  0.696  0.696  0.916  1.0
  Na  Na2  1  0.000  0.000  0.500  1.0
  Na  Na3  1  0.304  0.304  0.084  1.0
  Na  Na4  1  0.237  0.237  0.437  1.0
  Mn  Mn5  1  0.000  0.000  0.000  1.0
  Mn  Mn6  1  0.723  0.236  0.764  1.0
  Mn  Mn7  1  0.236  0.236  0.762  1.0
  Mn  Mn8  1  0.764  0.764  0.238  1.0
  Mn  Mn9  1  0.764  0.277  0.236  1.0
  Mn  Mn10  1  0.236  0.723  0.764  1.0
  Mn  Mn11  1  0.277  0.764  0.236  1.0
  O  O12  1  0.887  0.315  0.871  1.0
  O  O13  1  0.898  0.898  0.881  1.0
  O  O14  1  0.913  0.913  0.338  1.0
  O  O15  1  0.568  0.568  0.669  1.0
  O  O16  1  0.377  0.377  0.865  1.0
  O  O17  1  0.590  0.111  0.676  1.0
  O  O18  1  0.685  0.113  0.129  1.0
  O  O19  1  0.111  0.590  0.676  1.0
  O  O20  1  0.889  0.410  0.324  1.0
  O  O21  1  0.410  0.889  0.324  1.0
  O  O22  1  0.315  0.887  0.871  1.0
  O  O23  1  0.432  0.432  0.331  1.0
  O  O24  1  0.623  0.623  0.135  1.0
  O  O25  1  0.087  0.087  0.662  1.0
  O  O26  1  0.102  0.102  0.119  1.0
  O  O27  1  0.113  0.685  0.129  1.0
[/CIF]
.
The material structure described by Na5Mn7O16 crystallizes in the monoclinic C2/m space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to one O(3), one O(4), and two equivalent O(6) atoms. In the second Na site, Na(2) is bonded to one O(2), one O(5), and two equivalent O(1) atoms to form distorted NaO4 tetrahedra that share corners with three equivalent Mn(1)O6 octahedra, corners with three equivalent Mn(3)O6 octahedra, and corners with six equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-72°. In the third Na site, Na(3) is bonded in a 6-coordinate geometry to two equivalent O(3) and four equivalent O(6) atoms. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form MnO6 octahedra that share corners with six equivalent Na(2)O4 tetrahedra, edges with two equivalent Mn(3)O6 octahedra, and edges with four equivalent Mn(2)O6 octahedra. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form MnO6 octahedra that share corners with three equivalent Na(2)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with two equivalent Mn(3)O6 octahedra. In the third Mn site, Mn(3) is bonded to one O(3), one O(5), two equivalent O(1), and two equivalent O(6) atoms to form distorted MnO6 octahedra that share corners with three equivalent Na(2)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra, and edges with four equivalent Mn(2)O6 octahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Na(2), one Mn(1), one Mn(2), and one Mn(3) atom to form ONaMn3 tetrahedra that share corners with two equivalent O(2)NaMn3 tetrahedra, corners with three equivalent O(1)NaMn3 tetrahedra,  an edgeedge with one O(1)NaMn3 tetrahedra,  an edgeedge with one O(2)NaMn3 tetrahedra, and  an edgeedge with one O(3)Na2Mn3 trigonal bipyramid. In the second O site, O(2) is bonded to one Na(2), one Mn(1), and two equivalent Mn(2) atoms to form ONaMn3 tetrahedra that share  a cornercorner with one O(2)NaMn3 tetrahedra, corners with four equivalent O(1)NaMn3 tetrahedra, edges with two equivalent O(1)NaMn3 tetrahedra, and  an edgeedge with one O(3)Na2Mn3 trigonal bipyramid. In the third O site, O(3) is bonded to one Na(1), one Na(3), one Mn(3), and two equivalent Mn(2) atoms to form distorted ONa2Mn3 trigonal bipyramids that share  a cornercorner with one O(3)Na2Mn3 trigonal bipyramid,  an edgeedge with one O(2)NaMn3 tetrahedra, and edges with two equivalent O(1)NaMn3 tetrahedra. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Na(1) and two equivalent Mn(2) atoms. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Na(2), one Mn(3), and two equivalent Mn(2) atoms. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Na(1), one Na(3), one Mn(2), and one Mn(3) atom. is represented by the CIF card [CIF]
data_Na5Mn7O16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.198
_cell_length_b   6.198
_cell_length_c   10.707
_cell_angle_alpha   74.926
_cell_angle_beta   74.926
_cell_angle_gamma   56.870
_symmetry_Int_Tables_number   1
_cell_volume   329.084
_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  0.763  0.763  0.563  1.0
  Na  Na1  1  0.696  0.696  0.916  1.0
  Na  Na2  1  0.000  0.000  0.500  1.0
  Na  Na3  1  0.304  0.304  0.084  1.0
  Na  Na4  1  0.237  0.237  0.437  1.0
  Mn  Mn5  1  0.000  0.000  0.000  1.0
  Mn  Mn6  1  0.723  0.236  0.764  1.0
  Mn  Mn7  1  0.236  0.236  0.762  1.0
  Mn  Mn8  1  0.764  0.764  0.238  1.0
  Mn  Mn9  1  0.764  0.277  0.236  1.0
  Mn  Mn10  1  0.236  0.723  0.764  1.0
  Mn  Mn11  1  0.277  0.764  0.236  1.0
  O  O12  1  0.887  0.315  0.871  1.0
  O  O13  1  0.898  0.898  0.881  1.0
  O  O14  1  0.913  0.913  0.338  1.0
  O  O15  1  0.568  0.568  0.669  1.0
  O  O16  1  0.377  0.377  0.865  1.0
  O  O17  1  0.590  0.111  0.676  1.0
  O  O18  1  0.685  0.113  0.129  1.0
  O  O19  1  0.111  0.590  0.676  1.0
  O  O20  1  0.889  0.410  0.324  1.0
  O  O21  1  0.410  0.889  0.324  1.0
  O  O22  1  0.315  0.887  0.871  1.0
  O  O23  1  0.432  0.432  0.331  1.0
  O  O24  1  0.623  0.623  0.135  1.0
  O  O25  1  0.087  0.087  0.662  1.0
  O  O26  1  0.102  0.102  0.119  1.0
  O  O27  1  0.113  0.685  0.129  1.0
[/CIF]
.