The compound described by K3UF7 crystallizes in the tetragonal I4_1/a space group. There are three inequivalent K sites. In the first K site, K(1) is bonded to two equivalent F(3) and four equivalent F(2) atoms to form KF6 octahedra that share corners with six equivalent U(1)F7 pentagonal bipyramids. In the second K site, K(2) is bonded to four equivalent F(1) and four equivalent F(4) atoms to form distorted KF8 hexagonal bipyramids that share corners with four equivalent U(1)F7 pentagonal bipyramids and edges with two equivalent U(1)F7 pentagonal bipyramids. In the third K site, K(3) is bonded in a 9-coordinate geometry to two equivalent F(1), two equivalent F(3), two equivalent F(4), and three equivalent F(2) atoms. U(1) is bonded to one F(3), two equivalent F(1), two equivalent F(2), and two equivalent F(4) atoms to form UF7 pentagonal bipyramids that share corners with two equivalent K(2)F8 hexagonal bipyramids, corners with three equivalent K(1)F6 octahedra, and  an edgeedge with one K(2)F8 hexagonal bipyramid. The corner-sharing octahedral tilt angles range from 0-37°. There are four inequivalent F sites. In the first F site, F(1) is bonded in a 4-coordinate geometry to one K(2), two equivalent K(3), and one U(1) atom. In the second F site, F(2) is bonded in a 5-coordinate geometry to one K(1), three equivalent K(3), and one U(1) atom. In the third F site, F(3) is bonded in a 2-coordinate geometry to one K(1), four equivalent K(3), and one U(1) atom. In the fourth F site, F(4) is bonded to one K(2), two equivalent K(3), and one U(1) atom to form a mixture of corner and edge-sharing FK3U tetrahedra. is represented by the CIF card [CIF]
data_K3UF7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.370
_cell_length_b   11.370
_cell_length_c   11.370
_cell_angle_alpha   131.249
_cell_angle_beta   131.249
_cell_angle_gamma   71.418
_symmetry_Int_Tables_number   1
_cell_volume   813.167
_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  0.750  0.250  0.500  1.0
  K  K1  1  0.000  0.000  0.000  1.0
  K  K2  1  0.250  0.750  0.500  1.0
  K  K3  1  0.500  0.500  0.000  1.0
  K  K4  1  0.667  0.148  0.043  1.0
  K  K5  1  0.374  0.917  0.019  1.0
  K  K6  1  0.898  0.354  0.981  1.0
  K  K7  1  0.104  0.624  0.957  1.0
  K  K8  1  0.083  0.102  0.457  1.0
  K  K9  1  0.376  0.333  0.481  1.0
  K  K10  1  0.852  0.896  0.519  1.0
  K  K11  1  0.646  0.626  0.543  1.0
  U  U12  1  0.482  0.982  0.500  1.0
  U  U13  1  0.732  0.732  0.000  1.0
  U  U14  1  0.268  0.268  0.000  1.0
  U  U15  1  0.018  0.518  0.500  1.0
  F  F16  1  0.202  0.492  0.155  1.0
  F  F17  1  0.798  0.452  0.210  1.0
  F  F18  1  0.242  0.587  0.790  1.0
  F  F19  1  0.337  0.048  0.845  1.0
  F  F20  1  0.548  0.758  0.345  1.0
  F  F21  1  0.952  0.798  0.290  1.0
  F  F22  1  0.508  0.663  0.710  1.0
  F  F23  1  0.413  0.202  0.655  1.0
  F  F24  1  0.744  0.081  0.788  1.0
  F  F25  1  0.707  0.994  0.163  1.0
  F  F26  1  0.831  0.543  0.837  1.0
  F  F27  1  0.293  0.957  0.212  1.0
  F  F28  1  0.006  0.169  0.712  1.0
  F  F29  1  0.043  0.256  0.337  1.0
  F  F30  1  0.919  0.707  0.663  1.0
  F  F31  1  0.457  0.293  0.288  1.0
  F  F32  1  0.605  0.105  0.500  1.0
  F  F33  1  0.855  0.855  0.000  1.0
  F  F34  1  0.145  0.145  0.000  1.0
  F  F35  1  0.895  0.395  0.500  1.0
  F  F36  1  0.509  0.383  0.157  1.0
  F  F37  1  0.102  0.759  0.626  1.0
  F  F38  1  0.133  0.476  0.374  1.0
  F  F39  1  0.226  0.352  0.843  1.0
  F  F40  1  0.241  0.867  0.343  1.0
  F  F41  1  0.648  0.491  0.874  1.0
  F  F42  1  0.617  0.774  0.126  1.0
  F  F43  1  0.524  0.898  0.657  1.0
[/CIF]
.
The compound described by K3UF7 crystallizes in the tetragonal I4_1/a space group. There are three inequivalent K sites. In the first K site, K(1) is bonded to two equivalent F(3) and four equivalent F(2) atoms to form KF6 octahedra that share corners with six equivalent U(1)F7 pentagonal bipyramids. In the second K site, K(2) is bonded to four equivalent F(1) and four equivalent F(4) atoms to form distorted KF8 hexagonal bipyramids that share corners with four equivalent U(1)F7 pentagonal bipyramids and edges with two equivalent U(1)F7 pentagonal bipyramids. In the third K site, K(3) is bonded in a 9-coordinate geometry to two equivalent F(1), two equivalent F(3), two equivalent F(4), and three equivalent F(2) atoms. U(1) is bonded to one F(3), two equivalent F(1), two equivalent F(2), and two equivalent F(4) atoms to form UF7 pentagonal bipyramids that share corners with two equivalent K(2)F8 hexagonal bipyramids, corners with three equivalent K(1)F6 octahedra, and  an edgeedge with one K(2)F8 hexagonal bipyramid. The corner-sharing octahedral tilt angles range from 0-37°. There are four inequivalent F sites. In the first F site, F(1) is bonded in a 4-coordinate geometry to one K(2), two equivalent K(3), and one U(1) atom. In the second F site, F(2) is bonded in a 5-coordinate geometry to one K(1), three equivalent K(3), and one U(1) atom. In the third F site, F(3) is bonded in a 2-coordinate geometry to one K(1), four equivalent K(3), and one U(1) atom. In the fourth F site, F(4) is bonded to one K(2), two equivalent K(3), and one U(1) atom to form a mixture of corner and edge-sharing FK3U tetrahedra. is represented by the CIF card [CIF]
data_K3UF7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.370
_cell_length_b   11.370
_cell_length_c   11.370
_cell_angle_alpha   131.249
_cell_angle_beta   131.249
_cell_angle_gamma   71.418
_symmetry_Int_Tables_number   1
_cell_volume   813.167
_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  0.750  0.250  0.500  1.0
  K  K1  1  0.000  0.000  0.000  1.0
  K  K2  1  0.250  0.750  0.500  1.0
  K  K3  1  0.500  0.500  0.000  1.0
  K  K4  1  0.667  0.148  0.043  1.0
  K  K5  1  0.374  0.917  0.019  1.0
  K  K6  1  0.898  0.354  0.981  1.0
  K  K7  1  0.104  0.624  0.957  1.0
  K  K8  1  0.083  0.102  0.457  1.0
  K  K9  1  0.376  0.333  0.481  1.0
  K  K10  1  0.852  0.896  0.519  1.0
  K  K11  1  0.646  0.626  0.543  1.0
  U  U12  1  0.482  0.982  0.500  1.0
  U  U13  1  0.732  0.732  0.000  1.0
  U  U14  1  0.268  0.268  0.000  1.0
  U  U15  1  0.018  0.518  0.500  1.0
  F  F16  1  0.202  0.492  0.155  1.0
  F  F17  1  0.798  0.452  0.210  1.0
  F  F18  1  0.242  0.587  0.790  1.0
  F  F19  1  0.337  0.048  0.845  1.0
  F  F20  1  0.548  0.758  0.345  1.0
  F  F21  1  0.952  0.798  0.290  1.0
  F  F22  1  0.508  0.663  0.710  1.0
  F  F23  1  0.413  0.202  0.655  1.0
  F  F24  1  0.744  0.081  0.788  1.0
  F  F25  1  0.707  0.994  0.163  1.0
  F  F26  1  0.831  0.543  0.837  1.0
  F  F27  1  0.293  0.957  0.212  1.0
  F  F28  1  0.006  0.169  0.712  1.0
  F  F29  1  0.043  0.256  0.337  1.0
  F  F30  1  0.919  0.707  0.663  1.0
  F  F31  1  0.457  0.293  0.288  1.0
  F  F32  1  0.605  0.105  0.500  1.0
  F  F33  1  0.855  0.855  0.000  1.0
  F  F34  1  0.145  0.145  0.000  1.0
  F  F35  1  0.895  0.395  0.500  1.0
  F  F36  1  0.509  0.383  0.157  1.0
  F  F37  1  0.102  0.759  0.626  1.0
  F  F38  1  0.133  0.476  0.374  1.0
  F  F39  1  0.226  0.352  0.843  1.0
  F  F40  1  0.241  0.867  0.343  1.0
  F  F41  1  0.648  0.491  0.874  1.0
  F  F42  1  0.617  0.774  0.126  1.0
  F  F43  1  0.524  0.898  0.657  1.0
[/CIF]
.