The structure described by K3UO2F5 crystallizes in the tetragonal I4_1/a space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to two equivalent O(1), two equivalent F(2), two equivalent F(3), and three equivalent F(1) atoms. In the second K site, K(2) is bonded to four equivalent O(1) and four equivalent F(3) atoms to form distorted KO4F4 hexagonal bipyramids that share corners with four equivalent U(1)O2F5 pentagonal bipyramids and edges with two equivalent U(1)O2F5 pentagonal bipyramids. In the third K site, K(3) is bonded to two equivalent F(2) and four equivalent F(1) atoms to form KF6 octahedra that share corners with six equivalent U(1)O2F5 pentagonal bipyramids. U(1) is bonded to two equivalent O(1), one F(2), two equivalent F(1), and two equivalent F(3) atoms to form UO2F5 pentagonal bipyramids that share corners with two equivalent K(2)O4F4 hexagonal bipyramids, corners with three equivalent K(3)F6 octahedra, and  an edgeedge with one K(2)O4F4 hexagonal bipyramid. The corner-sharing octahedral tilt angles range from 0-36°. O(1) is bonded in a distorted single-bond geometry to one K(2), two equivalent K(1), and one U(1) atom. There are three inequivalent F sites. In the first F site, F(1) is bonded to one K(3), three equivalent K(1), and one U(1) atom to form distorted FK4U trigonal bipyramids that share corners with six equivalent F(3)K3U tetrahedra, corners with four equivalent F(1)K4U trigonal bipyramids,  an edgeedge with one F(3)K3U tetrahedra, and edges with three equivalent F(1)K4U trigonal bipyramids. In the second F site, F(2) is bonded in a 6-coordinate geometry to one K(3), four equivalent K(1), and one U(1) atom. In the third F site, F(3) is bonded to one K(2), two equivalent K(1), and one U(1) atom to form FK3U tetrahedra that share corners with four equivalent F(3)K3U tetrahedra, corners with six equivalent F(1)K4U trigonal bipyramids,  an edgeedge with one F(3)K3U tetrahedra, and  an edgeedge with one F(1)K4U trigonal bipyramid. is represented by the CIF file [CIF]
data_K3UO2F5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.084
_cell_length_b   11.084
_cell_length_c   11.084
_cell_angle_alpha   131.442
_cell_angle_beta   131.442
_cell_angle_gamma   71.112
_symmetry_Int_Tables_number   1
_cell_volume   749.176
_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  0.345  0.824  0.948  1.0
  K  K1  1  0.574  0.126  0.979  1.0
  K  K2  1  0.147  0.595  0.021  1.0
  K  K3  1  0.876  0.397  0.052  1.0
  K  K4  1  0.405  0.426  0.552  1.0
  K  K5  1  0.176  0.124  0.521  1.0
  K  K6  1  0.603  0.655  0.479  1.0
  K  K7  1  0.874  0.853  0.448  1.0
  K  K8  1  0.000  0.000  0.000  1.0
  K  K9  1  0.750  0.250  0.500  1.0
  K  K10  1  0.500  0.500  0.000  1.0
  K  K11  1  0.250  0.750  0.500  1.0
  U  U12  1  0.979  0.479  0.500  1.0
  U  U13  1  0.229  0.229  0.000  1.0
  U  U14  1  0.771  0.771  0.000  1.0
  U  U15  1  0.521  0.021  0.500  1.0
  O  O16  1  0.033  0.275  0.850  1.0
  O  O17  1  0.025  0.675  0.742  1.0
  O  O18  1  0.932  0.283  0.258  1.0
  O  O19  1  0.425  0.182  0.150  1.0
  O  O20  1  0.717  0.975  0.650  1.0
  O  O21  1  0.725  0.575  0.758  1.0
  O  O22  1  0.818  0.967  0.242  1.0
  O  O23  1  0.325  0.068  0.350  1.0
  F  F24  1  0.426  0.750  0.215  1.0
  F  F25  1  0.500  0.785  0.825  1.0
  F  F26  1  0.960  0.676  0.175  1.0
  F  F27  1  0.535  0.210  0.785  1.0
  F  F28  1  0.324  0.500  0.285  1.0
  F  F29  1  0.250  0.465  0.675  1.0
  F  F30  1  0.790  0.574  0.325  1.0
  F  F31  1  0.215  0.040  0.715  1.0
  F  F32  1  0.394  0.894  0.500  1.0
  F  F33  1  0.644  0.644  0.000  1.0
  F  F34  1  0.356  0.356  0.000  1.0
  F  F35  1  0.106  0.606  0.500  1.0
  F  F36  1  0.110  0.984  0.836  1.0
  F  F37  1  0.734  0.398  0.374  1.0
  F  F38  1  0.024  0.360  0.626  1.0
  F  F39  1  0.148  0.274  0.164  1.0
  F  F40  1  0.640  0.266  0.664  1.0
  F  F41  1  0.016  0.852  0.126  1.0
  F  F42  1  0.726  0.890  0.874  1.0
  F  F43  1  0.602  0.976  0.336  1.0
[/CIF]
.
The structure described by K3UO2F5 crystallizes in the tetragonal I4_1/a space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to two equivalent O(1), two equivalent F(2), two equivalent F(3), and three equivalent F(1) atoms. In the second K site, K(2) is bonded to four equivalent O(1) and four equivalent F(3) atoms to form distorted KO4F4 hexagonal bipyramids that share corners with four equivalent U(1)O2F5 pentagonal bipyramids and edges with two equivalent U(1)O2F5 pentagonal bipyramids. In the third K site, K(3) is bonded to two equivalent F(2) and four equivalent F(1) atoms to form KF6 octahedra that share corners with six equivalent U(1)O2F5 pentagonal bipyramids. U(1) is bonded to two equivalent O(1), one F(2), two equivalent F(1), and two equivalent F(3) atoms to form UO2F5 pentagonal bipyramids that share corners with two equivalent K(2)O4F4 hexagonal bipyramids, corners with three equivalent K(3)F6 octahedra, and  an edgeedge with one K(2)O4F4 hexagonal bipyramid. The corner-sharing octahedral tilt angles range from 0-36°. O(1) is bonded in a distorted single-bond geometry to one K(2), two equivalent K(1), and one U(1) atom. There are three inequivalent F sites. In the first F site, F(1) is bonded to one K(3), three equivalent K(1), and one U(1) atom to form distorted FK4U trigonal bipyramids that share corners with six equivalent F(3)K3U tetrahedra, corners with four equivalent F(1)K4U trigonal bipyramids,  an edgeedge with one F(3)K3U tetrahedra, and edges with three equivalent F(1)K4U trigonal bipyramids. In the second F site, F(2) is bonded in a 6-coordinate geometry to one K(3), four equivalent K(1), and one U(1) atom. In the third F site, F(3) is bonded to one K(2), two equivalent K(1), and one U(1) atom to form FK3U tetrahedra that share corners with four equivalent F(3)K3U tetrahedra, corners with six equivalent F(1)K4U trigonal bipyramids,  an edgeedge with one F(3)K3U tetrahedra, and  an edgeedge with one F(1)K4U trigonal bipyramid. is represented by the CIF file [CIF]
data_K3UO2F5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.084
_cell_length_b   11.084
_cell_length_c   11.084
_cell_angle_alpha   131.442
_cell_angle_beta   131.442
_cell_angle_gamma   71.112
_symmetry_Int_Tables_number   1
_cell_volume   749.176
_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  0.345  0.824  0.948  1.0
  K  K1  1  0.574  0.126  0.979  1.0
  K  K2  1  0.147  0.595  0.021  1.0
  K  K3  1  0.876  0.397  0.052  1.0
  K  K4  1  0.405  0.426  0.552  1.0
  K  K5  1  0.176  0.124  0.521  1.0
  K  K6  1  0.603  0.655  0.479  1.0
  K  K7  1  0.874  0.853  0.448  1.0
  K  K8  1  0.000  0.000  0.000  1.0
  K  K9  1  0.750  0.250  0.500  1.0
  K  K10  1  0.500  0.500  0.000  1.0
  K  K11  1  0.250  0.750  0.500  1.0
  U  U12  1  0.979  0.479  0.500  1.0
  U  U13  1  0.229  0.229  0.000  1.0
  U  U14  1  0.771  0.771  0.000  1.0
  U  U15  1  0.521  0.021  0.500  1.0
  O  O16  1  0.033  0.275  0.850  1.0
  O  O17  1  0.025  0.675  0.742  1.0
  O  O18  1  0.932  0.283  0.258  1.0
  O  O19  1  0.425  0.182  0.150  1.0
  O  O20  1  0.717  0.975  0.650  1.0
  O  O21  1  0.725  0.575  0.758  1.0
  O  O22  1  0.818  0.967  0.242  1.0
  O  O23  1  0.325  0.068  0.350  1.0
  F  F24  1  0.426  0.750  0.215  1.0
  F  F25  1  0.500  0.785  0.825  1.0
  F  F26  1  0.960  0.676  0.175  1.0
  F  F27  1  0.535  0.210  0.785  1.0
  F  F28  1  0.324  0.500  0.285  1.0
  F  F29  1  0.250  0.465  0.675  1.0
  F  F30  1  0.790  0.574  0.325  1.0
  F  F31  1  0.215  0.040  0.715  1.0
  F  F32  1  0.394  0.894  0.500  1.0
  F  F33  1  0.644  0.644  0.000  1.0
  F  F34  1  0.356  0.356  0.000  1.0
  F  F35  1  0.106  0.606  0.500  1.0
  F  F36  1  0.110  0.984  0.836  1.0
  F  F37  1  0.734  0.398  0.374  1.0
  F  F38  1  0.024  0.360  0.626  1.0
  F  F39  1  0.148  0.274  0.164  1.0
  F  F40  1  0.640  0.266  0.664  1.0
  F  F41  1  0.016  0.852  0.126  1.0
  F  F42  1  0.726  0.890  0.874  1.0
  F  F43  1  0.602  0.976  0.336  1.0
[/CIF]
.