The material structure described by K4P6O19NiO6 crystallizes in the orthorhombic Fmm2 space group. The structure consists of four NiO6 clusters inside a K4P6O19 framework. In each NiO6 cluster, Ni(1) is bonded in an octahedral geometry to two equivalent O(7), two equivalent O(8), and two equivalent O(9) atoms. There are three inequivalent O sites. In the first O site, O(9) is bonded in a single-bond geometry to one Ni(1) atom. In the second O site, O(8) is bonded in a single-bond geometry to one Ni(1) atom. In the third O site, O(7) is bonded in a single-bond geometry to one Ni(1) atom. In the K4P6O19 framework, there are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms. In the second K site, K(2) is bonded to one O(10), one O(3), two equivalent O(5), and two equivalent O(6) atoms to form KO6 octahedra that share  a cornercorner with one K(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and corners with four equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 46°. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(3), one O(4), and two equivalent O(1) atoms to form PO4 tetrahedra that share  a cornercorner with one K(2)O6 octahedra and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 38°. In the second P site, P(2) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent K(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 45-62°. There are seven inequivalent O sites. In the first O site, O(10) is bonded in a distorted bent 120 degrees geometry to two equivalent K(2) atoms. In the second O site, O(1) is bonded in a bent 120 degrees geometry to one K(1), one P(1), and one P(2) atom. In the third O site, O(2) is bonded in a distorted bent 120 degrees geometry to two equivalent P(2) atoms. In the fourth O site, O(3) is bonded in a distorted single-bond geometry to one K(2), two equivalent K(1), and one P(1) atom. In the fifth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent K(1) and one P(1) atom. In the sixth O site, O(5) is bonded in a distorted single-bond geometry to one K(2) and one P(2) atom. In the seventh O site, O(6) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one P(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K4NiP6O25
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   13.134
_cell_length_b   12.543
_cell_length_c   7.362
_cell_angle_alpha   77.803
_cell_angle_beta   68.976
_cell_angle_gamma   33.220
_symmetry_Int_Tables_number   1
_cell_volume   610.734
_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
  K  K0  1  0.529  0.971  0.529  1.0
  K  K1  1  0.029  0.471  0.029  1.0
  K  K2  1  0.724  0.500  0.500  1.0
  K  K3  1  0.500  0.276  0.724  1.0
  Ni  Ni4  1  0.996  0.004  0.996  1.0
  P  P5  1  0.505  0.962  0.038  1.0
  P  P6  1  0.038  0.495  0.505  1.0
  P  P7  1  0.618  0.640  0.023  1.0
  P  P8  1  0.023  0.719  0.618  1.0
  P  P9  1  0.360  0.382  0.281  1.0
  P  P10  1  0.281  0.977  0.360  1.0
  O  O11  1  0.586  0.793  0.922  1.0
  O  O12  1  0.922  0.699  0.586  1.0
  O  O13  1  0.207  0.414  0.301  1.0
  O  O14  1  0.301  0.078  0.207  1.0
  O  O15  1  0.423  0.781  0.219  1.0
  O  O16  1  0.219  0.577  0.423  1.0
  O  O17  1  0.443  0.102  0.898  1.0
  O  O18  1  0.898  0.557  0.443  1.0
  O  O19  1  0.646  0.866  0.134  1.0
  O  O20  1  0.134  0.354  0.646  1.0
  O  O21  1  0.611  0.575  0.888  1.0
  O  O22  1  0.888  0.927  0.611  1.0
  O  O23  1  0.425  0.389  0.073  1.0
  O  O24  1  0.073  0.112  0.425  1.0
  O  O25  1  0.795  0.485  0.090  1.0
  O  O26  1  0.090  0.631  0.795  1.0
  O  O27  1  0.515  0.205  0.369  1.0
  O  O28  1  0.369  0.910  0.515  1.0
  O  O29  1  0.097  0.070  0.930  1.0
  O  O30  1  0.930  0.903  0.097  1.0
  O  O31  1  0.255  0.745  0.922  1.0
  O  O32  1  0.922  0.078  0.255  1.0
  O  O33  1  0.077  0.923  0.742  1.0
  O  O34  1  0.742  0.258  0.077  1.0
  O  O35  1  0.517  0.483  0.517  1.0
[/CIF]
.
The material structure described by K4P6O19NiO6 crystallizes in the orthorhombic Fmm2 space group. The structure consists of four NiO6 clusters inside a K4P6O19 framework. In each NiO6 cluster, Ni(1) is bonded in an octahedral geometry to two equivalent O(7), two equivalent O(8), and two equivalent O(9) atoms. There are three inequivalent O sites. In the first O site, O(9) is bonded in a single-bond geometry to one Ni(1) atom. In the second O site, O(8) is bonded in a single-bond geometry to one Ni(1) atom. In the third O site, O(7) is bonded in a single-bond geometry to one Ni(1) atom. In the K4P6O19 framework, there are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms. In the second K site, K(2) is bonded to one O(10), one O(3), two equivalent O(5), and two equivalent O(6) atoms to form KO6 octahedra that share  a cornercorner with one K(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and corners with four equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 46°. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(3), one O(4), and two equivalent O(1) atoms to form PO4 tetrahedra that share  a cornercorner with one K(2)O6 octahedra and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 38°. In the second P site, P(2) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent K(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 45-62°. There are seven inequivalent O sites. In the first O site, O(10) is bonded in a distorted bent 120 degrees geometry to two equivalent K(2) atoms. In the second O site, O(1) is bonded in a bent 120 degrees geometry to one K(1), one P(1), and one P(2) atom. In the third O site, O(2) is bonded in a distorted bent 120 degrees geometry to two equivalent P(2) atoms. In the fourth O site, O(3) is bonded in a distorted single-bond geometry to one K(2), two equivalent K(1), and one P(1) atom. In the fifth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent K(1) and one P(1) atom. In the sixth O site, O(5) is bonded in a distorted single-bond geometry to one K(2) and one P(2) atom. In the seventh O site, O(6) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one P(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K4NiP6O25
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   13.134
_cell_length_b   12.543
_cell_length_c   7.362
_cell_angle_alpha   77.803
_cell_angle_beta   68.976
_cell_angle_gamma   33.220
_symmetry_Int_Tables_number   1
_cell_volume   610.734
_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
  K  K0  1  0.529  0.971  0.529  1.0
  K  K1  1  0.029  0.471  0.029  1.0
  K  K2  1  0.724  0.500  0.500  1.0
  K  K3  1  0.500  0.276  0.724  1.0
  Ni  Ni4  1  0.996  0.004  0.996  1.0
  P  P5  1  0.505  0.962  0.038  1.0
  P  P6  1  0.038  0.495  0.505  1.0
  P  P7  1  0.618  0.640  0.023  1.0
  P  P8  1  0.023  0.719  0.618  1.0
  P  P9  1  0.360  0.382  0.281  1.0
  P  P10  1  0.281  0.977  0.360  1.0
  O  O11  1  0.586  0.793  0.922  1.0
  O  O12  1  0.922  0.699  0.586  1.0
  O  O13  1  0.207  0.414  0.301  1.0
  O  O14  1  0.301  0.078  0.207  1.0
  O  O15  1  0.423  0.781  0.219  1.0
  O  O16  1  0.219  0.577  0.423  1.0
  O  O17  1  0.443  0.102  0.898  1.0
  O  O18  1  0.898  0.557  0.443  1.0
  O  O19  1  0.646  0.866  0.134  1.0
  O  O20  1  0.134  0.354  0.646  1.0
  O  O21  1  0.611  0.575  0.888  1.0
  O  O22  1  0.888  0.927  0.611  1.0
  O  O23  1  0.425  0.389  0.073  1.0
  O  O24  1  0.073  0.112  0.425  1.0
  O  O25  1  0.795  0.485  0.090  1.0
  O  O26  1  0.090  0.631  0.795  1.0
  O  O27  1  0.515  0.205  0.369  1.0
  O  O28  1  0.369  0.910  0.515  1.0
  O  O29  1  0.097  0.070  0.930  1.0
  O  O30  1  0.930  0.903  0.097  1.0
  O  O31  1  0.255  0.745  0.922  1.0
  O  O32  1  0.922  0.078  0.255  1.0
  O  O33  1  0.077  0.923  0.742  1.0
  O  O34  1  0.742  0.258  0.077  1.0
  O  O35  1  0.517  0.483  0.517  1.0
[/CIF]
.