The material described by U2GaAl3 crystallizes in the trigonal R-3m space group. U(1) is bonded in a 16-coordinate geometry to four equivalent U(1), three equivalent Ga(1), and nine equivalent Al(1) atoms. Ga(1) is bonded to six equivalent U(1) and six equivalent Al(1) atoms to form GaU6Al6 cuboctahedra that share corners with six equivalent Ga(1)U6Al6 cuboctahedra, corners with twelve equivalent Al(1)U6Al4Ga2 cuboctahedra, edges with six equivalent Ga(1)U6Al6 cuboctahedra, and faces with eighteen equivalent Al(1)U6Al4Ga2 cuboctahedra. Al(1) is bonded to six equivalent U(1), two equivalent Ga(1), and four equivalent Al(1) atoms to form AlU6Al4Ga2 cuboctahedra that share corners with four equivalent Ga(1)U6Al6 cuboctahedra, corners with fourteen equivalent Al(1)U6Al4Ga2 cuboctahedra, edges with six equivalent Al(1)U6Al4Ga2 cuboctahedra, faces with six equivalent Ga(1)U6Al6 cuboctahedra, and faces with twelve equivalent Al(1)U6Al4Ga2 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_U2Al3Ga
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.460
_cell_length_b   5.460
_cell_length_c   5.460
_cell_angle_alpha   59.984
_cell_angle_beta   59.984
_cell_angle_gamma   59.984
_symmetry_Int_Tables_number   1
_cell_volume   115.076
_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  0.124  0.124  0.124  1.0
  U  U1  1  0.876  0.876  0.876  1.0
  Al  Al2  1  0.500  0.000  0.500  1.0
  Al  Al3  1  0.000  0.500  0.500  1.0
  Al  Al4  1  0.500  0.500  0.000  1.0
  Ga  Ga5  1  0.500  0.500  0.500  1.0
[/CIF]
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The material described by U2GaAl3 crystallizes in the trigonal R-3m space group. U(1) is bonded in a 16-coordinate geometry to four equivalent U(1), three equivalent Ga(1), and nine equivalent Al(1) atoms. Ga(1) is bonded to six equivalent U(1) and six equivalent Al(1) atoms to form GaU6Al6 cuboctahedra that share corners with six equivalent Ga(1)U6Al6 cuboctahedra, corners with twelve equivalent Al(1)U6Al4Ga2 cuboctahedra, edges with six equivalent Ga(1)U6Al6 cuboctahedra, and faces with eighteen equivalent Al(1)U6Al4Ga2 cuboctahedra. Al(1) is bonded to six equivalent U(1), two equivalent Ga(1), and four equivalent Al(1) atoms to form AlU6Al4Ga2 cuboctahedra that share corners with four equivalent Ga(1)U6Al6 cuboctahedra, corners with fourteen equivalent Al(1)U6Al4Ga2 cuboctahedra, edges with six equivalent Al(1)U6Al4Ga2 cuboctahedra, faces with six equivalent Ga(1)U6Al6 cuboctahedra, and faces with twelve equivalent Al(1)U6Al4Ga2 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_U2Al3Ga
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.460
_cell_length_b   5.460
_cell_length_c   5.460
_cell_angle_alpha   59.984
_cell_angle_beta   59.984
_cell_angle_gamma   59.984
_symmetry_Int_Tables_number   1
_cell_volume   115.076
_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  0.124  0.124  0.124  1.0
  U  U1  1  0.876  0.876  0.876  1.0
  Al  Al2  1  0.500  0.000  0.500  1.0
  Al  Al3  1  0.000  0.500  0.500  1.0
  Al  Al4  1  0.500  0.500  0.000  1.0
  Ga  Ga5  1  0.500  0.500  0.500  1.0
[/CIF]
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