The structure described by NaKZnP2O7 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), and two equivalent O(6) atoms. Na(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(5), one O(6), and two equivalent O(2) atoms. Zn(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form ZnO4 tetrahedra that share corners with two equivalent P(1)O4 tetrahedra and corners with two equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(4), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra and corners with two equivalent Zn(1)O4 tetrahedra. In the second P site, P(2) is bonded to one O(1), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and corners with two equivalent Zn(1)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(6) is bonded in a 4-coordinate geometry to two equivalent K(1), one Na(1), and one P(2) atom. In the second O site, O(7) is bonded in a distorted bent 120 degrees geometry to one K(1), one P(1), and one P(2) atom. In the third O site, O(1) is bonded in a 4-coordinate geometry to one K(1), one Na(1), one Zn(1), and one P(2) atom. In the fourth O site, O(2) is bonded in a 4-coordinate geometry to one K(1), two equivalent Na(1), and one P(1) atom. In the fifth O site, O(3) is bonded in a 3-coordinate geometry to one K(1), one Na(1), one Zn(1), and one P(1) atom. In the sixth O site, O(4) is bonded in a 2-coordinate geometry to one K(1), one Zn(1), and one P(1) atom. In the seventh O site, O(5) is bonded in a distorted trigonal planar geometry to one Na(1), one Zn(1), and one P(2) atom. is represented by the CIF file [CIF]
data_KNaZnP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.373
_cell_length_b   7.547
_cell_length_c   14.839
_cell_angle_alpha   59.391
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   710.660
_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
  K  K0  1  0.793  0.797  0.603  1.0
  K  K1  1  0.707  0.797  0.103  1.0
  K  K2  1  0.207  0.203  0.397  1.0
  K  K3  1  0.293  0.203  0.897  1.0
  Na  Na4  1  0.523  0.740  0.888  1.0
  Na  Na5  1  0.023  0.260  0.612  1.0
  Na  Na6  1  0.477  0.260  0.112  1.0
  Na  Na7  1  0.977  0.740  0.388  1.0
  Zn  Zn8  1  0.520  0.209  0.621  1.0
  Zn  Zn9  1  0.480  0.791  0.379  1.0
  Zn  Zn10  1  0.980  0.209  0.121  1.0
  Zn  Zn11  1  0.020  0.791  0.879  1.0
  P  P12  1  0.714  0.424  0.401  1.0
  P  P13  1  0.786  0.424  0.901  1.0
  P  P14  1  0.781  0.178  0.797  1.0
  P  P15  1  0.719  0.178  0.297  1.0
  P  P16  1  0.214  0.576  0.099  1.0
  P  P17  1  0.286  0.576  0.599  1.0
  P  P18  1  0.219  0.822  0.203  1.0
  P  P19  1  0.281  0.822  0.703  1.0
  O  O20  1  0.477  0.910  0.682  1.0
  O  O21  1  0.098  0.634  0.551  1.0
  O  O22  1  0.902  0.366  0.449  1.0
  O  O23  1  0.817  0.659  0.849  1.0
  O  O24  1  0.402  0.634  0.051  1.0
  O  O25  1  0.556  0.297  0.473  1.0
  O  O26  1  0.683  0.659  0.349  1.0
  O  O27  1  0.598  0.366  0.949  1.0
  O  O28  1  0.183  0.341  0.151  1.0
  O  O29  1  0.523  0.090  0.318  1.0
  O  O30  1  0.444  0.703  0.527  1.0
  O  O31  1  0.263  0.740  0.319  1.0
  O  O32  1  0.360  0.962  0.125  1.0
  O  O33  1  0.056  0.703  0.027  1.0
  O  O34  1  0.297  0.608  0.700  1.0
  O  O35  1  0.737  0.260  0.681  1.0
  O  O36  1  0.944  0.297  0.973  1.0
  O  O37  1  0.237  0.740  0.819  1.0
  O  O38  1  0.763  0.260  0.181  1.0
  O  O39  1  0.703  0.392  0.300  1.0
  O  O40  1  0.140  0.962  0.625  1.0
  O  O41  1  0.860  0.038  0.375  1.0
  O  O42  1  0.977  0.090  0.818  1.0
  O  O43  1  0.640  0.038  0.875  1.0
  O  O44  1  0.023  0.910  0.182  1.0
  O  O45  1  0.317  0.341  0.651  1.0
  O  O46  1  0.797  0.392  0.800  1.0
  O  O47  1  0.203  0.608  0.200  1.0
[/CIF]
.
The structure described by NaKZnP2O7 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), and two equivalent O(6) atoms. Na(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(5), one O(6), and two equivalent O(2) atoms. Zn(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form ZnO4 tetrahedra that share corners with two equivalent P(1)O4 tetrahedra and corners with two equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(4), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra and corners with two equivalent Zn(1)O4 tetrahedra. In the second P site, P(2) is bonded to one O(1), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and corners with two equivalent Zn(1)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(6) is bonded in a 4-coordinate geometry to two equivalent K(1), one Na(1), and one P(2) atom. In the second O site, O(7) is bonded in a distorted bent 120 degrees geometry to one K(1), one P(1), and one P(2) atom. In the third O site, O(1) is bonded in a 4-coordinate geometry to one K(1), one Na(1), one Zn(1), and one P(2) atom. In the fourth O site, O(2) is bonded in a 4-coordinate geometry to one K(1), two equivalent Na(1), and one P(1) atom. In the fifth O site, O(3) is bonded in a 3-coordinate geometry to one K(1), one Na(1), one Zn(1), and one P(1) atom. In the sixth O site, O(4) is bonded in a 2-coordinate geometry to one K(1), one Zn(1), and one P(1) atom. In the seventh O site, O(5) is bonded in a distorted trigonal planar geometry to one Na(1), one Zn(1), and one P(2) atom. is represented by the CIF file [CIF]
data_KNaZnP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.373
_cell_length_b   7.547
_cell_length_c   14.839
_cell_angle_alpha   59.391
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   710.660
_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
  K  K0  1  0.793  0.797  0.603  1.0
  K  K1  1  0.707  0.797  0.103  1.0
  K  K2  1  0.207  0.203  0.397  1.0
  K  K3  1  0.293  0.203  0.897  1.0
  Na  Na4  1  0.523  0.740  0.888  1.0
  Na  Na5  1  0.023  0.260  0.612  1.0
  Na  Na6  1  0.477  0.260  0.112  1.0
  Na  Na7  1  0.977  0.740  0.388  1.0
  Zn  Zn8  1  0.520  0.209  0.621  1.0
  Zn  Zn9  1  0.480  0.791  0.379  1.0
  Zn  Zn10  1  0.980  0.209  0.121  1.0
  Zn  Zn11  1  0.020  0.791  0.879  1.0
  P  P12  1  0.714  0.424  0.401  1.0
  P  P13  1  0.786  0.424  0.901  1.0
  P  P14  1  0.781  0.178  0.797  1.0
  P  P15  1  0.719  0.178  0.297  1.0
  P  P16  1  0.214  0.576  0.099  1.0
  P  P17  1  0.286  0.576  0.599  1.0
  P  P18  1  0.219  0.822  0.203  1.0
  P  P19  1  0.281  0.822  0.703  1.0
  O  O20  1  0.477  0.910  0.682  1.0
  O  O21  1  0.098  0.634  0.551  1.0
  O  O22  1  0.902  0.366  0.449  1.0
  O  O23  1  0.817  0.659  0.849  1.0
  O  O24  1  0.402  0.634  0.051  1.0
  O  O25  1  0.556  0.297  0.473  1.0
  O  O26  1  0.683  0.659  0.349  1.0
  O  O27  1  0.598  0.366  0.949  1.0
  O  O28  1  0.183  0.341  0.151  1.0
  O  O29  1  0.523  0.090  0.318  1.0
  O  O30  1  0.444  0.703  0.527  1.0
  O  O31  1  0.263  0.740  0.319  1.0
  O  O32  1  0.360  0.962  0.125  1.0
  O  O33  1  0.056  0.703  0.027  1.0
  O  O34  1  0.297  0.608  0.700  1.0
  O  O35  1  0.737  0.260  0.681  1.0
  O  O36  1  0.944  0.297  0.973  1.0
  O  O37  1  0.237  0.740  0.819  1.0
  O  O38  1  0.763  0.260  0.181  1.0
  O  O39  1  0.703  0.392  0.300  1.0
  O  O40  1  0.140  0.962  0.625  1.0
  O  O41  1  0.860  0.038  0.375  1.0
  O  O42  1  0.977  0.090  0.818  1.0
  O  O43  1  0.640  0.038  0.875  1.0
  O  O44  1  0.023  0.910  0.182  1.0
  O  O45  1  0.317  0.341  0.651  1.0
  O  O46  1  0.797  0.392  0.800  1.0
  O  O47  1  0.203  0.608  0.200  1.0
[/CIF]
.