The material structure described by K4U3(AsO8)2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(1), one O(4), one O(6), one O(7), two equivalent O(5), and two equivalent O(8) atoms. In the second K site, K(2) is bonded in a 3-coordinate geometry to one O(3), one O(6), and two equivalent O(1) atoms. There are two inequivalent U sites. In the first U site, U(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and two equivalent O(7) atoms to form distorted UO7 pentagonal bipyramids that share corners with three equivalent As(1)O4 tetrahedra and  an edgeedge with one U(1)O7 pentagonal bipyramid. In the second U site, U(2) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(4), two equivalent O(7), and two equivalent O(8) atoms. As(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AsO4 tetrahedra that share corners with three equivalent U(1)O7 pentagonal bipyramids. There are eight inequivalent O sites. In the first O site, O(5) is bonded in a distorted single-bond geometry to two equivalent K(1) and one U(1) atom. In the second O site, O(6) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one U(1) atom. In the third O site, O(7) is bonded in a distorted trigonal planar geometry to one K(1), one U(2), and two equivalent U(1) atoms. In the fourth O site, O(8) is bonded in a distorted single-bond geometry to two equivalent K(1) and one U(2) atom. In the fifth O site, O(1) is bonded in a 4-coordinate geometry to one K(1), two equivalent K(2), and one As(1) atom. In the sixth O site, O(2) is bonded in a distorted bent 150 degrees geometry to one U(1) and one As(1) atom. In the seventh O site, O(3) is bonded in a 4-coordinate geometry to one K(2), one U(1), one U(2), and one As(1) atom. In the eighth O site, O(4) is bonded in a 4-coordinate geometry to one K(1), one U(1), one U(2), and one As(1) atom. is represented by the CIF card [CIF]
data_K4U3(AsO8)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   17.550
_cell_length_b   7.027
_cell_length_c   7.191
_cell_angle_alpha   81.492
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   877.053
_cell_formula_units_Z   2
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  0.552  0.962  0.258  1.0
  K  K1  1  0.052  0.038  0.242  1.0
  K  K2  1  0.448  0.038  0.742  1.0
  K  K3  1  0.948  0.962  0.758  1.0
  K  K4  1  0.201  0.170  0.723  1.0
  K  K5  1  0.701  0.830  0.777  1.0
  K  K6  1  0.799  0.830  0.277  1.0
  K  K7  1  0.299  0.170  0.223  1.0
  U  U8  1  0.102  0.569  0.984  1.0
  U  U9  1  0.602  0.431  0.516  1.0
  U  U10  1  0.898  0.431  0.016  1.0
  U  U11  1  0.398  0.569  0.484  1.0
  U  U12  1  0.000  0.500  0.500  1.0
  U  U13  1  0.500  0.500  0.000  1.0
  As  As14  1  0.181  0.701  0.471  1.0
  As  As15  1  0.681  0.299  0.029  1.0
  As  As16  1  0.819  0.299  0.529  1.0
  As  As17  1  0.319  0.701  0.971  1.0
  O  O18  1  0.188  0.942  0.452  1.0
  O  O19  1  0.688  0.058  0.048  1.0
  O  O20  1  0.812  0.058  0.548  1.0
  O  O21  1  0.312  0.942  0.952  1.0
  O  O22  1  0.233  0.583  0.975  1.0
  O  O23  1  0.733  0.417  0.525  1.0
  O  O24  1  0.767  0.417  0.025  1.0
  O  O25  1  0.267  0.583  0.475  1.0
  O  O26  1  0.126  0.585  0.656  1.0
  O  O27  1  0.626  0.415  0.844  1.0
  O  O28  1  0.874  0.415  0.344  1.0
  O  O29  1  0.374  0.585  0.156  1.0
  O  O30  1  0.121  0.630  0.302  1.0
  O  O31  1  0.621  0.370  0.198  1.0
  O  O32  1  0.879  0.370  0.698  1.0
  O  O33  1  0.379  0.630  0.802  1.0
  O  O34  1  0.085  0.833  0.940  1.0
  O  O35  1  0.585  0.167  0.560  1.0
  O  O36  1  0.915  0.167  0.060  1.0
  O  O37  1  0.415  0.833  0.440  1.0
  O  O38  1  0.126  0.309  0.018  1.0
  O  O39  1  0.626  0.691  0.482  1.0
  O  O40  1  0.874  0.691  0.982  1.0
  O  O41  1  0.374  0.309  0.518  1.0
  O  O42  1  0.502  0.516  0.315  1.0
  O  O43  1  0.002  0.484  0.185  1.0
  O  O44  1  0.498  0.484  0.685  1.0
  O  O45  1  0.998  0.516  0.815  1.0
  O  O46  1  0.033  0.248  0.542  1.0
  O  O47  1  0.533  0.752  0.958  1.0
  O  O48  1  0.967  0.752  0.458  1.0
  O  O49  1  0.467  0.248  0.042  1.0
[/CIF]
.
The material structure described by K4U3(AsO8)2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(1), one O(4), one O(6), one O(7), two equivalent O(5), and two equivalent O(8) atoms. In the second K site, K(2) is bonded in a 3-coordinate geometry to one O(3), one O(6), and two equivalent O(1) atoms. There are two inequivalent U sites. In the first U site, U(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and two equivalent O(7) atoms to form distorted UO7 pentagonal bipyramids that share corners with three equivalent As(1)O4 tetrahedra and  an edgeedge with one U(1)O7 pentagonal bipyramid. In the second U site, U(2) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(4), two equivalent O(7), and two equivalent O(8) atoms. As(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AsO4 tetrahedra that share corners with three equivalent U(1)O7 pentagonal bipyramids. There are eight inequivalent O sites. In the first O site, O(5) is bonded in a distorted single-bond geometry to two equivalent K(1) and one U(1) atom. In the second O site, O(6) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one U(1) atom. In the third O site, O(7) is bonded in a distorted trigonal planar geometry to one K(1), one U(2), and two equivalent U(1) atoms. In the fourth O site, O(8) is bonded in a distorted single-bond geometry to two equivalent K(1) and one U(2) atom. In the fifth O site, O(1) is bonded in a 4-coordinate geometry to one K(1), two equivalent K(2), and one As(1) atom. In the sixth O site, O(2) is bonded in a distorted bent 150 degrees geometry to one U(1) and one As(1) atom. In the seventh O site, O(3) is bonded in a 4-coordinate geometry to one K(2), one U(1), one U(2), and one As(1) atom. In the eighth O site, O(4) is bonded in a 4-coordinate geometry to one K(1), one U(1), one U(2), and one As(1) atom. is represented by the CIF card [CIF]
data_K4U3(AsO8)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   17.550
_cell_length_b   7.027
_cell_length_c   7.191
_cell_angle_alpha   81.492
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   877.053
_cell_formula_units_Z   2
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  0.552  0.962  0.258  1.0
  K  K1  1  0.052  0.038  0.242  1.0
  K  K2  1  0.448  0.038  0.742  1.0
  K  K3  1  0.948  0.962  0.758  1.0
  K  K4  1  0.201  0.170  0.723  1.0
  K  K5  1  0.701  0.830  0.777  1.0
  K  K6  1  0.799  0.830  0.277  1.0
  K  K7  1  0.299  0.170  0.223  1.0
  U  U8  1  0.102  0.569  0.984  1.0
  U  U9  1  0.602  0.431  0.516  1.0
  U  U10  1  0.898  0.431  0.016  1.0
  U  U11  1  0.398  0.569  0.484  1.0
  U  U12  1  0.000  0.500  0.500  1.0
  U  U13  1  0.500  0.500  0.000  1.0
  As  As14  1  0.181  0.701  0.471  1.0
  As  As15  1  0.681  0.299  0.029  1.0
  As  As16  1  0.819  0.299  0.529  1.0
  As  As17  1  0.319  0.701  0.971  1.0
  O  O18  1  0.188  0.942  0.452  1.0
  O  O19  1  0.688  0.058  0.048  1.0
  O  O20  1  0.812  0.058  0.548  1.0
  O  O21  1  0.312  0.942  0.952  1.0
  O  O22  1  0.233  0.583  0.975  1.0
  O  O23  1  0.733  0.417  0.525  1.0
  O  O24  1  0.767  0.417  0.025  1.0
  O  O25  1  0.267  0.583  0.475  1.0
  O  O26  1  0.126  0.585  0.656  1.0
  O  O27  1  0.626  0.415  0.844  1.0
  O  O28  1  0.874  0.415  0.344  1.0
  O  O29  1  0.374  0.585  0.156  1.0
  O  O30  1  0.121  0.630  0.302  1.0
  O  O31  1  0.621  0.370  0.198  1.0
  O  O32  1  0.879  0.370  0.698  1.0
  O  O33  1  0.379  0.630  0.802  1.0
  O  O34  1  0.085  0.833  0.940  1.0
  O  O35  1  0.585  0.167  0.560  1.0
  O  O36  1  0.915  0.167  0.060  1.0
  O  O37  1  0.415  0.833  0.440  1.0
  O  O38  1  0.126  0.309  0.018  1.0
  O  O39  1  0.626  0.691  0.482  1.0
  O  O40  1  0.874  0.691  0.982  1.0
  O  O41  1  0.374  0.309  0.518  1.0
  O  O42  1  0.502  0.516  0.315  1.0
  O  O43  1  0.002  0.484  0.185  1.0
  O  O44  1  0.498  0.484  0.685  1.0
  O  O45  1  0.998  0.516  0.815  1.0
  O  O46  1  0.033  0.248  0.542  1.0
  O  O47  1  0.533  0.752  0.958  1.0
  O  O48  1  0.967  0.752  0.458  1.0
  O  O49  1  0.467  0.248  0.042  1.0
[/CIF]
.