The material structure described by U(CuAs)2 crystallizes in the trigonal P-3m1 space group. U(1) is bonded to six equivalent As(1) atoms to form UAs6 octahedra that share corners with twelve equivalent Cu(1)As4 tetrahedra, edges with six equivalent U(1)As6 octahedra, and edges with six equivalent Cu(1)As4 tetrahedra. Cu(1) is bonded to four equivalent As(1) atoms to form CuAs4 tetrahedra that share corners with six equivalent U(1)As6 octahedra, corners with six equivalent Cu(1)As4 tetrahedra, edges with three equivalent U(1)As6 octahedra, and edges with three equivalent Cu(1)As4 tetrahedra. The corner-sharing octahedral tilt angles range from 18-55°. As(1) is bonded to three equivalent U(1) and four equivalent Cu(1) atoms to form a mixture of distorted edge and corner-sharing AsU3Cu4 pentagonal bipyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_U(CuAs)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.060
_cell_length_b   4.060
_cell_length_c   6.562
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   93.660
_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
  Cu  Cu1  1  0.667  0.333  0.636  1.0
  Cu  Cu2  1  0.333  0.667  0.364  1.0
  As  As3  1  0.667  0.333  0.254  1.0
  As  As4  1  0.333  0.667  0.746  1.0
[/CIF]
.
The material structure described by U(CuAs)2 crystallizes in the trigonal P-3m1 space group. U(1) is bonded to six equivalent As(1) atoms to form UAs6 octahedra that share corners with twelve equivalent Cu(1)As4 tetrahedra, edges with six equivalent U(1)As6 octahedra, and edges with six equivalent Cu(1)As4 tetrahedra. Cu(1) is bonded to four equivalent As(1) atoms to form CuAs4 tetrahedra that share corners with six equivalent U(1)As6 octahedra, corners with six equivalent Cu(1)As4 tetrahedra, edges with three equivalent U(1)As6 octahedra, and edges with three equivalent Cu(1)As4 tetrahedra. The corner-sharing octahedral tilt angles range from 18-55°. As(1) is bonded to three equivalent U(1) and four equivalent Cu(1) atoms to form a mixture of distorted edge and corner-sharing AsU3Cu4 pentagonal bipyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_U(CuAs)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.060
_cell_length_b   4.060
_cell_length_c   6.562
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   93.660
_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
  Cu  Cu1  1  0.667  0.333  0.636  1.0
  Cu  Cu2  1  0.333  0.667  0.364  1.0
  As  As3  1  0.667  0.333  0.254  1.0
  As  As4  1  0.333  0.667  0.746  1.0
[/CIF]
.