The compound described by UYAs2 is Caswellsilverite-like structured and crystallizes in the tetragonal P4/mmm space group. U(1) is bonded to two equivalent As(1) and four equivalent As(2) atoms to form UAs6 octahedra that share corners with six equivalent U(1)As6 octahedra, edges with four equivalent U(1)As6 octahedra, and edges with eight equivalent Y(1)As6 octahedra. The corner-sharing octahedra are not tilted. Y(1) is bonded to two equivalent As(2) and four equivalent As(1) atoms to form YAs6 octahedra that share corners with six equivalent Y(1)As6 octahedra, edges with four equivalent Y(1)As6 octahedra, and edges with eight equivalent U(1)As6 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent As sites. In the first As site, As(1) is bonded to two equivalent U(1) and four equivalent Y(1) atoms to form AsY4U2 octahedra that share corners with six equivalent As(1)Y4U2 octahedra, edges with four equivalent As(1)Y4U2 octahedra, and edges with eight equivalent As(2)Y2U4 octahedra. The corner-sharing octahedra are not tilted. In the second As site, As(2) is bonded to four equivalent U(1) and two equivalent Y(1) atoms to form AsY2U4 octahedra that share corners with six equivalent As(2)Y2U4 octahedra, edges with four equivalent As(2)Y2U4 octahedra, and edges with eight equivalent As(1)Y4U2 octahedra. The corner-sharing octahedra are not tilted. is represented by the Crystallographic Information File (CIF) [CIF]
data_YUAs2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.131
_cell_length_b   4.131
_cell_length_c   5.825
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   99.415
_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
  Y  Y0  1  0.500  0.500  0.000  1.0
  U  U1  1  0.000  0.000  0.500  1.0
  As  As2  1  0.000  0.000  0.000  1.0
  As  As3  1  0.500  0.500  0.500  1.0
[/CIF]
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The compound described by UYAs2 is Caswellsilverite-like structured and crystallizes in the tetragonal P4/mmm space group. U(1) is bonded to two equivalent As(1) and four equivalent As(2) atoms to form UAs6 octahedra that share corners with six equivalent U(1)As6 octahedra, edges with four equivalent U(1)As6 octahedra, and edges with eight equivalent Y(1)As6 octahedra. The corner-sharing octahedra are not tilted. Y(1) is bonded to two equivalent As(2) and four equivalent As(1) atoms to form YAs6 octahedra that share corners with six equivalent Y(1)As6 octahedra, edges with four equivalent Y(1)As6 octahedra, and edges with eight equivalent U(1)As6 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent As sites. In the first As site, As(1) is bonded to two equivalent U(1) and four equivalent Y(1) atoms to form AsY4U2 octahedra that share corners with six equivalent As(1)Y4U2 octahedra, edges with four equivalent As(1)Y4U2 octahedra, and edges with eight equivalent As(2)Y2U4 octahedra. The corner-sharing octahedra are not tilted. In the second As site, As(2) is bonded to four equivalent U(1) and two equivalent Y(1) atoms to form AsY2U4 octahedra that share corners with six equivalent As(2)Y2U4 octahedra, edges with four equivalent As(2)Y2U4 octahedra, and edges with eight equivalent As(1)Y4U2 octahedra. The corner-sharing octahedra are not tilted. is represented by the Crystallographic Information File (CIF) [CIF]
data_YUAs2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.131
_cell_length_b   4.131
_cell_length_c   5.825
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   99.415
_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
  Y  Y0  1  0.500  0.500  0.000  1.0
  U  U1  1  0.000  0.000  0.500  1.0
  As  As2  1  0.000  0.000  0.000  1.0
  As  As3  1  0.500  0.500  0.500  1.0
[/CIF]
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