The structure described by KYP2O7 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(7), two equivalent O(3), and two equivalent O(6) atoms. Y(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(6), and one O(7) atom to form YO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three 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(6) atom to form PO4 tetrahedra that share corners with three equivalent Y(1)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 20-54°. In the second P site, P(2) is bonded to one O(1), one O(4), one O(5), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent Y(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 14-52°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one K(1), one Y(1), and one P(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one K(1), one Y(1), and one P(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent K(1), one Y(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted linear geometry to one Y(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to two equivalent K(1), one Y(1), and one P(1) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one K(1), one Y(1), and one P(2) atom. is represented by the CIF card [CIF]
data_KYP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.553
_cell_length_b   8.594
_cell_length_c   10.953
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   107.534
_symmetry_Int_Tables_number   1
_cell_volume   677.927
_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  0.827  0.426  0.820  1.0
  K  K1  1  0.827  0.926  0.680  1.0
  K  K2  1  0.173  0.074  0.320  1.0
  K  K3  1  0.173  0.574  0.180  1.0
  Y  Y4  1  0.230  0.750  0.593  1.0
  Y  Y5  1  0.770  0.750  0.093  1.0
  Y  Y6  1  0.230  0.250  0.907  1.0
  Y  Y7  1  0.770  0.250  0.407  1.0
  P  P8  1  0.872  0.192  0.105  1.0
  P  P9  1  0.128  0.308  0.605  1.0
  P  P10  1  0.872  0.692  0.395  1.0
  P  P11  1  0.128  0.808  0.895  1.0
  P  P12  1  0.553  0.807  0.354  1.0
  P  P13  1  0.447  0.693  0.854  1.0
  P  P14  1  0.447  0.193  0.646  1.0
  P  P15  1  0.553  0.307  0.146  1.0
  O  O16  1  0.362  0.255  0.089  1.0
  O  O17  1  0.872  0.018  0.097  1.0
  O  O18  1  0.067  0.234  0.730  1.0
  O  O19  1  0.933  0.266  0.230  1.0
  O  O20  1  0.872  0.518  0.403  1.0
  O  O21  1  0.339  0.308  0.583  1.0
  O  O22  1  0.664  0.980  0.384  1.0
  O  O23  1  0.986  0.796  0.497  1.0
  O  O24  1  0.014  0.704  0.997  1.0
  O  O25  1  0.661  0.692  0.417  1.0
  O  O26  1  0.362  0.755  0.411  1.0
  O  O27  1  0.541  0.267  0.281  1.0
  O  O28  1  0.014  0.204  0.503  1.0
  O  O29  1  0.661  0.192  0.083  1.0
  O  O30  1  0.933  0.766  0.270  1.0
  O  O31  1  0.128  0.982  0.903  1.0
  O  O32  1  0.339  0.808  0.917  1.0
  O  O33  1  0.336  0.520  0.884  1.0
  O  O34  1  0.638  0.245  0.589  1.0
  O  O35  1  0.459  0.733  0.719  1.0
  O  O36  1  0.128  0.482  0.597  1.0
  O  O37  1  0.336  0.020  0.616  1.0
  O  O38  1  0.638  0.745  0.911  1.0
  O  O39  1  0.664  0.480  0.116  1.0
  O  O40  1  0.986  0.296  0.003  1.0
  O  O41  1  0.541  0.767  0.219  1.0
  O  O42  1  0.067  0.734  0.770  1.0
  O  O43  1  0.459  0.233  0.781  1.0
[/CIF]
.
The structure described by KYP2O7 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(7), two equivalent O(3), and two equivalent O(6) atoms. Y(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(6), and one O(7) atom to form YO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three 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(6) atom to form PO4 tetrahedra that share corners with three equivalent Y(1)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 20-54°. In the second P site, P(2) is bonded to one O(1), one O(4), one O(5), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent Y(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 14-52°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one K(1), one Y(1), and one P(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one K(1), one Y(1), and one P(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent K(1), one Y(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted linear geometry to one Y(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to two equivalent K(1), one Y(1), and one P(1) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one K(1), one Y(1), and one P(2) atom. is represented by the CIF card [CIF]
data_KYP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.553
_cell_length_b   8.594
_cell_length_c   10.953
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   107.534
_symmetry_Int_Tables_number   1
_cell_volume   677.927
_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  0.827  0.426  0.820  1.0
  K  K1  1  0.827  0.926  0.680  1.0
  K  K2  1  0.173  0.074  0.320  1.0
  K  K3  1  0.173  0.574  0.180  1.0
  Y  Y4  1  0.230  0.750  0.593  1.0
  Y  Y5  1  0.770  0.750  0.093  1.0
  Y  Y6  1  0.230  0.250  0.907  1.0
  Y  Y7  1  0.770  0.250  0.407  1.0
  P  P8  1  0.872  0.192  0.105  1.0
  P  P9  1  0.128  0.308  0.605  1.0
  P  P10  1  0.872  0.692  0.395  1.0
  P  P11  1  0.128  0.808  0.895  1.0
  P  P12  1  0.553  0.807  0.354  1.0
  P  P13  1  0.447  0.693  0.854  1.0
  P  P14  1  0.447  0.193  0.646  1.0
  P  P15  1  0.553  0.307  0.146  1.0
  O  O16  1  0.362  0.255  0.089  1.0
  O  O17  1  0.872  0.018  0.097  1.0
  O  O18  1  0.067  0.234  0.730  1.0
  O  O19  1  0.933  0.266  0.230  1.0
  O  O20  1  0.872  0.518  0.403  1.0
  O  O21  1  0.339  0.308  0.583  1.0
  O  O22  1  0.664  0.980  0.384  1.0
  O  O23  1  0.986  0.796  0.497  1.0
  O  O24  1  0.014  0.704  0.997  1.0
  O  O25  1  0.661  0.692  0.417  1.0
  O  O26  1  0.362  0.755  0.411  1.0
  O  O27  1  0.541  0.267  0.281  1.0
  O  O28  1  0.014  0.204  0.503  1.0
  O  O29  1  0.661  0.192  0.083  1.0
  O  O30  1  0.933  0.766  0.270  1.0
  O  O31  1  0.128  0.982  0.903  1.0
  O  O32  1  0.339  0.808  0.917  1.0
  O  O33  1  0.336  0.520  0.884  1.0
  O  O34  1  0.638  0.245  0.589  1.0
  O  O35  1  0.459  0.733  0.719  1.0
  O  O36  1  0.128  0.482  0.597  1.0
  O  O37  1  0.336  0.020  0.616  1.0
  O  O38  1  0.638  0.745  0.911  1.0
  O  O39  1  0.664  0.480  0.116  1.0
  O  O40  1  0.986  0.296  0.003  1.0
  O  O41  1  0.541  0.767  0.219  1.0
  O  O42  1  0.067  0.734  0.770  1.0
  O  O43  1  0.459  0.233  0.781  1.0
[/CIF]
.