The compound described by UBi4(AsO8)2 crystallizes in the triclinic P-1 space group. U(1) is bonded to two equivalent O(1), two equivalent O(6), and two equivalent O(7) atoms to form UO6 octahedra that share corners with four equivalent As(1)O4 tetrahedra. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 7-coordinate geometry to one O(4), one O(5), one O(8), two equivalent O(2), and two equivalent O(3) atoms. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(5), one O(8), and two equivalent O(3) atoms. As(1) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form AsO4 tetrahedra that share corners with two equivalent U(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 31-39°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one U(1) and one Bi(2) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Bi(2) and two equivalent Bi(1) atoms. In the third O site, O(3) is bonded to two equivalent Bi(1) and two equivalent Bi(2) atoms to form edge-sharing OBi4 tetrahedra. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Bi(1) and one As(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Bi(1), one Bi(2), and one As(1) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one U(1) and one As(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one U(1) and one As(1) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Bi(1) and one Bi(2) atom. is represented by the CIF card [CIF]
data_UBi4(AsO8)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.598
_cell_length_b   6.705
_cell_length_c   10.977
_cell_angle_alpha   75.494
_cell_angle_beta   78.845
_cell_angle_gamma   71.967
_symmetry_Int_Tables_number   1
_cell_volume   376.275
_cell_formula_units_Z   1
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
  U  U0  1  0.000  0.000  0.000  1.0
  Bi  Bi1  1  0.413  0.771  0.542  1.0
  Bi  Bi2  1  0.587  0.229  0.458  1.0
  Bi  Bi3  1  0.997  0.595  0.324  1.0
  Bi  Bi4  1  0.003  0.405  0.676  1.0
  As  As5  1  0.372  0.070  0.226  1.0
  As  As6  1  0.628  0.930  0.774  1.0
  O  O7  1  0.160  0.731  0.086  1.0
  O  O8  1  0.840  0.269  0.914  1.0
  O  O9  1  0.724  0.904  0.434  1.0
  O  O10  1  0.276  0.096  0.566  1.0
  O  O11  1  0.259  0.500  0.482  1.0
  O  O12  1  0.741  0.500  0.518  1.0
  O  O13  1  0.284  0.870  0.346  1.0
  O  O14  1  0.716  0.130  0.654  1.0
  O  O15  1  0.356  0.288  0.288  1.0
  O  O16  1  0.644  0.712  0.712  1.0
  O  O17  1  0.173  0.143  0.113  1.0
  O  O18  1  0.827  0.857  0.887  1.0
  O  O19  1  0.677  0.967  0.160  1.0
  O  O20  1  0.323  0.033  0.840  1.0
  O  O21  1  0.179  0.651  0.691  1.0
  O  O22  1  0.821  0.349  0.309  1.0
[/CIF]
.
The compound described by UBi4(AsO8)2 crystallizes in the triclinic P-1 space group. U(1) is bonded to two equivalent O(1), two equivalent O(6), and two equivalent O(7) atoms to form UO6 octahedra that share corners with four equivalent As(1)O4 tetrahedra. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 7-coordinate geometry to one O(4), one O(5), one O(8), two equivalent O(2), and two equivalent O(3) atoms. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(5), one O(8), and two equivalent O(3) atoms. As(1) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form AsO4 tetrahedra that share corners with two equivalent U(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 31-39°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one U(1) and one Bi(2) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Bi(2) and two equivalent Bi(1) atoms. In the third O site, O(3) is bonded to two equivalent Bi(1) and two equivalent Bi(2) atoms to form edge-sharing OBi4 tetrahedra. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Bi(1) and one As(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Bi(1), one Bi(2), and one As(1) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one U(1) and one As(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one U(1) and one As(1) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Bi(1) and one Bi(2) atom. is represented by the CIF card [CIF]
data_UBi4(AsO8)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.598
_cell_length_b   6.705
_cell_length_c   10.977
_cell_angle_alpha   75.494
_cell_angle_beta   78.845
_cell_angle_gamma   71.967
_symmetry_Int_Tables_number   1
_cell_volume   376.275
_cell_formula_units_Z   1
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
  U  U0  1  0.000  0.000  0.000  1.0
  Bi  Bi1  1  0.413  0.771  0.542  1.0
  Bi  Bi2  1  0.587  0.229  0.458  1.0
  Bi  Bi3  1  0.997  0.595  0.324  1.0
  Bi  Bi4  1  0.003  0.405  0.676  1.0
  As  As5  1  0.372  0.070  0.226  1.0
  As  As6  1  0.628  0.930  0.774  1.0
  O  O7  1  0.160  0.731  0.086  1.0
  O  O8  1  0.840  0.269  0.914  1.0
  O  O9  1  0.724  0.904  0.434  1.0
  O  O10  1  0.276  0.096  0.566  1.0
  O  O11  1  0.259  0.500  0.482  1.0
  O  O12  1  0.741  0.500  0.518  1.0
  O  O13  1  0.284  0.870  0.346  1.0
  O  O14  1  0.716  0.130  0.654  1.0
  O  O15  1  0.356  0.288  0.288  1.0
  O  O16  1  0.644  0.712  0.712  1.0
  O  O17  1  0.173  0.143  0.113  1.0
  O  O18  1  0.827  0.857  0.887  1.0
  O  O19  1  0.677  0.967  0.160  1.0
  O  O20  1  0.323  0.033  0.840  1.0
  O  O21  1  0.179  0.651  0.691  1.0
  O  O22  1  0.821  0.349  0.309  1.0
[/CIF]
.