The crystal structure described by KZnP2O7 crystallizes in the orthorhombic Pmc2_1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(2), and four equivalent O(3) atoms. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(8), two equivalent O(6), and four equivalent O(7) atoms. Zn(1) is bonded to one O(2), one O(4), one O(5), and one O(7) 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(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and corners with two equivalent Zn(1)O4 tetrahedra. In the second P site, P(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra and corners with two equivalent Zn(1)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one K(1) and two equivalent P(1) atoms. In the second O site, O(2) is bonded in a 3-coordinate geometry to one K(1), one Zn(1), and one P(1) atom. In the third O site, O(3) is bonded in a single-bond geometry to two equivalent K(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Zn(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Zn(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(2) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to two equivalent K(2), one Zn(1), and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one K(2) and two equivalent P(2) atoms. is represented by the CIF file [CIF]
data_KZnP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.133
_cell_length_b   10.377
_cell_length_c   12.849
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   684.424
_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  0.994  0.267  0.000  1.0
  K  K1  1  0.006  0.767  0.000  1.0
  K  K2  1  0.501  0.487  0.500  1.0
  K  K3  1  0.499  0.987  0.500  1.0
  Zn  Zn4  1  0.525  0.273  0.252  1.0
  Zn  Zn5  1  0.475  0.773  0.252  1.0
  Zn  Zn6  1  0.475  0.773  0.748  1.0
  Zn  Zn7  1  0.525  0.273  0.748  1.0
  P  P8  1  0.472  0.024  0.114  1.0
  P  P9  1  0.528  0.524  0.114  1.0
  P  P10  1  0.016  0.223  0.387  1.0
  P  P11  1  0.984  0.723  0.387  1.0
  P  P12  1  0.016  0.223  0.613  1.0
  P  P13  1  0.984  0.723  0.613  1.0
  P  P14  1  0.472  0.024  0.886  1.0
  P  P15  1  0.528  0.524  0.886  1.0
  O  O16  1  0.420  0.480  0.000  1.0
  O  O17  1  0.580  0.980  0.000  1.0
  O  O18  1  0.567  0.164  0.127  1.0
  O  O19  1  0.433  0.664  0.127  1.0
  O  O20  1  0.176  0.013  0.116  1.0
  O  O21  1  0.824  0.513  0.116  1.0
  O  O22  1  0.396  0.433  0.191  1.0
  O  O23  1  0.604  0.933  0.191  1.0
  O  O24  1  0.129  0.808  0.309  1.0
  O  O25  1  0.871  0.308  0.309  1.0
  O  O26  1  0.087  0.586  0.388  1.0
  O  O27  1  0.913  0.086  0.388  1.0
  O  O28  1  0.315  0.230  0.374  1.0
  O  O29  1  0.685  0.730  0.374  1.0
  O  O30  1  0.958  0.290  0.500  1.0
  O  O31  1  0.042  0.790  0.500  1.0
  O  O32  1  0.315  0.230  0.626  1.0
  O  O33  1  0.685  0.730  0.626  1.0
  O  O34  1  0.087  0.586  0.612  1.0
  O  O35  1  0.913  0.086  0.612  1.0
  O  O36  1  0.129  0.808  0.691  1.0
  O  O37  1  0.871  0.308  0.691  1.0
  O  O38  1  0.396  0.433  0.809  1.0
  O  O39  1  0.604  0.933  0.809  1.0
  O  O40  1  0.176  0.013  0.884  1.0
  O  O41  1  0.824  0.513  0.884  1.0
  O  O42  1  0.433  0.664  0.873  1.0
  O  O43  1  0.567  0.164  0.873  1.0
[/CIF]
.
The crystal structure described by KZnP2O7 crystallizes in the orthorhombic Pmc2_1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(2), and four equivalent O(3) atoms. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(8), two equivalent O(6), and four equivalent O(7) atoms. Zn(1) is bonded to one O(2), one O(4), one O(5), and one O(7) 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(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and corners with two equivalent Zn(1)O4 tetrahedra. In the second P site, P(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra and corners with two equivalent Zn(1)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one K(1) and two equivalent P(1) atoms. In the second O site, O(2) is bonded in a 3-coordinate geometry to one K(1), one Zn(1), and one P(1) atom. In the third O site, O(3) is bonded in a single-bond geometry to two equivalent K(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Zn(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Zn(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(2) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to two equivalent K(2), one Zn(1), and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one K(2) and two equivalent P(2) atoms. is represented by the CIF file [CIF]
data_KZnP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.133
_cell_length_b   10.377
_cell_length_c   12.849
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   684.424
_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  0.994  0.267  0.000  1.0
  K  K1  1  0.006  0.767  0.000  1.0
  K  K2  1  0.501  0.487  0.500  1.0
  K  K3  1  0.499  0.987  0.500  1.0
  Zn  Zn4  1  0.525  0.273  0.252  1.0
  Zn  Zn5  1  0.475  0.773  0.252  1.0
  Zn  Zn6  1  0.475  0.773  0.748  1.0
  Zn  Zn7  1  0.525  0.273  0.748  1.0
  P  P8  1  0.472  0.024  0.114  1.0
  P  P9  1  0.528  0.524  0.114  1.0
  P  P10  1  0.016  0.223  0.387  1.0
  P  P11  1  0.984  0.723  0.387  1.0
  P  P12  1  0.016  0.223  0.613  1.0
  P  P13  1  0.984  0.723  0.613  1.0
  P  P14  1  0.472  0.024  0.886  1.0
  P  P15  1  0.528  0.524  0.886  1.0
  O  O16  1  0.420  0.480  0.000  1.0
  O  O17  1  0.580  0.980  0.000  1.0
  O  O18  1  0.567  0.164  0.127  1.0
  O  O19  1  0.433  0.664  0.127  1.0
  O  O20  1  0.176  0.013  0.116  1.0
  O  O21  1  0.824  0.513  0.116  1.0
  O  O22  1  0.396  0.433  0.191  1.0
  O  O23  1  0.604  0.933  0.191  1.0
  O  O24  1  0.129  0.808  0.309  1.0
  O  O25  1  0.871  0.308  0.309  1.0
  O  O26  1  0.087  0.586  0.388  1.0
  O  O27  1  0.913  0.086  0.388  1.0
  O  O28  1  0.315  0.230  0.374  1.0
  O  O29  1  0.685  0.730  0.374  1.0
  O  O30  1  0.958  0.290  0.500  1.0
  O  O31  1  0.042  0.790  0.500  1.0
  O  O32  1  0.315  0.230  0.626  1.0
  O  O33  1  0.685  0.730  0.626  1.0
  O  O34  1  0.087  0.586  0.612  1.0
  O  O35  1  0.913  0.086  0.612  1.0
  O  O36  1  0.129  0.808  0.691  1.0
  O  O37  1  0.871  0.308  0.691  1.0
  O  O38  1  0.396  0.433  0.809  1.0
  O  O39  1  0.604  0.933  0.809  1.0
  O  O40  1  0.176  0.013  0.884  1.0
  O  O41  1  0.824  0.513  0.884  1.0
  O  O42  1  0.433  0.664  0.873  1.0
  O  O43  1  0.567  0.164  0.873  1.0
[/CIF]
.