The structure described by ULa2As3 is Caswellsilverite-like structured and crystallizes in the orthorhombic Immm 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 two equivalent U(1)As6 octahedra, corners with four equivalent La(1)As6 octahedra, edges with two equivalent U(1)As6 octahedra, and edges with ten equivalent La(1)As6 octahedra. The corner-sharing octahedral tilt angles range from 0-4°. La(1) is bonded to two equivalent As(1) and four equivalent As(2) atoms to form LaAs6 octahedra that share corners with two equivalent U(1)As6 octahedra, corners with four equivalent La(1)As6 octahedra, edges with five equivalent U(1)As6 octahedra, and edges with seven equivalent La(1)As6 octahedra. The corner-sharing octahedral tilt angles range from 0-7°. There are two inequivalent As sites. In the first As site, As(1) is bonded to two equivalent U(1) and four equivalent La(1) atoms to form a mixture of corner and edge-sharing AsLa4U2 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the second As site, As(2) is bonded to two equivalent U(1) and four equivalent La(1) atoms to form a mixture of corner and edge-sharing AsLa4U2 octahedra. The corner-sharing octahedral tilt angles range from 0-7°. is represented by the CIF card [CIF]
data_La2UAs3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.439
_cell_length_b   7.439
_cell_length_c   7.439
_cell_angle_alpha   146.730
_cell_angle_beta   131.985
_cell_angle_gamma   59.667
_symmetry_Int_Tables_number   1
_cell_volume   166.358
_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
  La  La0  1  0.668  0.668  0.000  1.0
  La  La1  1  0.332  0.332  0.000  1.0
  U  U2  1  0.000  0.000  0.000  1.0
  As  As3  1  0.500  0.000  0.500  1.0
  As  As4  1  0.155  0.655  0.500  1.0
  As  As5  1  0.845  0.345  0.500  1.0
[/CIF]
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The structure described by ULa2As3 is Caswellsilverite-like structured and crystallizes in the orthorhombic Immm 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 two equivalent U(1)As6 octahedra, corners with four equivalent La(1)As6 octahedra, edges with two equivalent U(1)As6 octahedra, and edges with ten equivalent La(1)As6 octahedra. The corner-sharing octahedral tilt angles range from 0-4°. La(1) is bonded to two equivalent As(1) and four equivalent As(2) atoms to form LaAs6 octahedra that share corners with two equivalent U(1)As6 octahedra, corners with four equivalent La(1)As6 octahedra, edges with five equivalent U(1)As6 octahedra, and edges with seven equivalent La(1)As6 octahedra. The corner-sharing octahedral tilt angles range from 0-7°. There are two inequivalent As sites. In the first As site, As(1) is bonded to two equivalent U(1) and four equivalent La(1) atoms to form a mixture of corner and edge-sharing AsLa4U2 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the second As site, As(2) is bonded to two equivalent U(1) and four equivalent La(1) atoms to form a mixture of corner and edge-sharing AsLa4U2 octahedra. The corner-sharing octahedral tilt angles range from 0-7°. is represented by the CIF card [CIF]
data_La2UAs3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.439
_cell_length_b   7.439
_cell_length_c   7.439
_cell_angle_alpha   146.730
_cell_angle_beta   131.985
_cell_angle_gamma   59.667
_symmetry_Int_Tables_number   1
_cell_volume   166.358
_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
  La  La0  1  0.668  0.668  0.000  1.0
  La  La1  1  0.332  0.332  0.000  1.0
  U  U2  1  0.000  0.000  0.000  1.0
  As  As3  1  0.500  0.000  0.500  1.0
  As  As4  1  0.155  0.655  0.500  1.0
  As  As5  1  0.845  0.345  0.500  1.0
[/CIF]
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