The compound described by K2ZnP2O7 crystallizes in the tetragonal P4_2/mnm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. In the second K site, K(2) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. Zn(1) is bonded to four equivalent O(1) atoms to form ZnO4 tetrahedra that share corners with four equivalent P(1)O4 tetrahedra. P(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms 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 three inequivalent O sites. In the first O site, O(2) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), and one P(1) atom. In the second O site, O(3) is bonded in a 2-coordinate geometry to two equivalent K(1) and two equivalent P(1) atoms. In the third O site, O(1) is bonded in a distorted bent 120 degrees geometry to one K(1), one K(2), one Zn(1), and one P(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2ZnP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.984
_cell_length_b   7.984
_cell_length_c   11.494
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   732.642
_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  0.316  0.316  0.000  1.0
  K  K1  1  0.684  0.684  0.000  1.0
  K  K2  1  0.816  0.184  0.500  1.0
  K  K3  1  0.184  0.816  0.500  1.0
  K  K4  1  0.151  0.849  0.000  1.0
  K  K5  1  0.651  0.651  0.500  1.0
  K  K6  1  0.349  0.349  0.500  1.0
  K  K7  1  0.849  0.151  0.000  1.0
  Zn  Zn8  1  0.500  0.000  0.250  1.0
  Zn  Zn9  1  0.000  0.500  0.250  1.0
  Zn  Zn10  1  0.000  0.500  0.750  1.0
  Zn  Zn11  1  0.500  0.000  0.750  1.0
  P  P12  1  0.864  0.864  0.719  1.0
  P  P13  1  0.136  0.136  0.719  1.0
  P  P14  1  0.864  0.864  0.281  1.0
  P  P15  1  0.364  0.636  0.219  1.0
  P  P16  1  0.636  0.364  0.219  1.0
  P  P17  1  0.636  0.364  0.781  1.0
  P  P18  1  0.364  0.636  0.781  1.0
  P  P19  1  0.136  0.136  0.281  1.0
  O  O20  1  0.079  0.302  0.340  1.0
  O  O21  1  0.921  0.698  0.340  1.0
  O  O22  1  0.302  0.079  0.660  1.0
  O  O23  1  0.802  0.421  0.840  1.0
  O  O24  1  0.198  0.579  0.840  1.0
  O  O25  1  0.421  0.802  0.160  1.0
  O  O26  1  0.579  0.198  0.160  1.0
  O  O27  1  0.698  0.921  0.660  1.0
  O  O28  1  0.921  0.698  0.660  1.0
  O  O29  1  0.079  0.302  0.660  1.0
  O  O30  1  0.698  0.921  0.340  1.0
  O  O31  1  0.198  0.579  0.160  1.0
  O  O32  1  0.802  0.421  0.160  1.0
  O  O33  1  0.579  0.198  0.840  1.0
  O  O34  1  0.421  0.802  0.840  1.0
  O  O35  1  0.302  0.079  0.340  1.0
  O  O36  1  0.864  0.864  0.850  1.0
  O  O37  1  0.136  0.136  0.850  1.0
  O  O38  1  0.864  0.864  0.150  1.0
  O  O39  1  0.364  0.636  0.350  1.0
  O  O40  1  0.000  0.000  0.332  1.0
  O  O41  1  0.500  0.500  0.832  1.0
  O  O42  1  0.500  0.500  0.168  1.0
  O  O43  1  0.000  0.000  0.668  1.0
  O  O44  1  0.136  0.136  0.150  1.0
  O  O45  1  0.364  0.636  0.650  1.0
  O  O46  1  0.636  0.364  0.650  1.0
  O  O47  1  0.636  0.364  0.350  1.0
[/CIF]
.
The compound described by K2ZnP2O7 crystallizes in the tetragonal P4_2/mnm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. In the second K site, K(2) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. Zn(1) is bonded to four equivalent O(1) atoms to form ZnO4 tetrahedra that share corners with four equivalent P(1)O4 tetrahedra. P(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms 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 three inequivalent O sites. In the first O site, O(2) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), and one P(1) atom. In the second O site, O(3) is bonded in a 2-coordinate geometry to two equivalent K(1) and two equivalent P(1) atoms. In the third O site, O(1) is bonded in a distorted bent 120 degrees geometry to one K(1), one K(2), one Zn(1), and one P(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2ZnP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.984
_cell_length_b   7.984
_cell_length_c   11.494
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   732.642
_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  0.316  0.316  0.000  1.0
  K  K1  1  0.684  0.684  0.000  1.0
  K  K2  1  0.816  0.184  0.500  1.0
  K  K3  1  0.184  0.816  0.500  1.0
  K  K4  1  0.151  0.849  0.000  1.0
  K  K5  1  0.651  0.651  0.500  1.0
  K  K6  1  0.349  0.349  0.500  1.0
  K  K7  1  0.849  0.151  0.000  1.0
  Zn  Zn8  1  0.500  0.000  0.250  1.0
  Zn  Zn9  1  0.000  0.500  0.250  1.0
  Zn  Zn10  1  0.000  0.500  0.750  1.0
  Zn  Zn11  1  0.500  0.000  0.750  1.0
  P  P12  1  0.864  0.864  0.719  1.0
  P  P13  1  0.136  0.136  0.719  1.0
  P  P14  1  0.864  0.864  0.281  1.0
  P  P15  1  0.364  0.636  0.219  1.0
  P  P16  1  0.636  0.364  0.219  1.0
  P  P17  1  0.636  0.364  0.781  1.0
  P  P18  1  0.364  0.636  0.781  1.0
  P  P19  1  0.136  0.136  0.281  1.0
  O  O20  1  0.079  0.302  0.340  1.0
  O  O21  1  0.921  0.698  0.340  1.0
  O  O22  1  0.302  0.079  0.660  1.0
  O  O23  1  0.802  0.421  0.840  1.0
  O  O24  1  0.198  0.579  0.840  1.0
  O  O25  1  0.421  0.802  0.160  1.0
  O  O26  1  0.579  0.198  0.160  1.0
  O  O27  1  0.698  0.921  0.660  1.0
  O  O28  1  0.921  0.698  0.660  1.0
  O  O29  1  0.079  0.302  0.660  1.0
  O  O30  1  0.698  0.921  0.340  1.0
  O  O31  1  0.198  0.579  0.160  1.0
  O  O32  1  0.802  0.421  0.160  1.0
  O  O33  1  0.579  0.198  0.840  1.0
  O  O34  1  0.421  0.802  0.840  1.0
  O  O35  1  0.302  0.079  0.340  1.0
  O  O36  1  0.864  0.864  0.850  1.0
  O  O37  1  0.136  0.136  0.850  1.0
  O  O38  1  0.864  0.864  0.150  1.0
  O  O39  1  0.364  0.636  0.350  1.0
  O  O40  1  0.000  0.000  0.332  1.0
  O  O41  1  0.500  0.500  0.832  1.0
  O  O42  1  0.500  0.500  0.168  1.0
  O  O43  1  0.000  0.000  0.668  1.0
  O  O44  1  0.136  0.136  0.150  1.0
  O  O45  1  0.364  0.636  0.650  1.0
  O  O46  1  0.636  0.364  0.650  1.0
  O  O47  1  0.636  0.364  0.350  1.0
[/CIF]
.