The crystal structure described by U3(CuGa2)4 crystallizes in the tetragonal I-4m2 space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 16-coordinate geometry to two equivalent Cu(1), two equivalent Cu(2), two equivalent Cu(3), two equivalent Ga(1), four equivalent Ga(2), and four equivalent Ga(3) atoms. In the second U site, U(2) is bonded in a 16-coordinate geometry to four equivalent Cu(2), four equivalent Ga(1), and eight equivalent Ga(4) atoms. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to four equivalent U(1) and four equivalent Ga(2) atoms to form distorted CuU4Ga4 tetrahedra that share corners with four equivalent Ga(1)U4Ga4Cu4 cuboctahedra, corners with eight equivalent Cu(2)U4Ga8 cuboctahedra, edges with two equivalent Ga(1)U4Ga4Cu4 cuboctahedra, edges with four equivalent Cu(1)U4Ga4 tetrahedra, and faces with four equivalent Cu(3)U4Ga4 tetrahedra. In the second Cu site, Cu(2) is bonded to two equivalent U(1), two equivalent U(2), two equivalent Ga(3), two equivalent Ga(4), and four equivalent Ga(1) atoms to form distorted CuU4Ga8 cuboctahedra that share corners with two equivalent Ga(1)U4Ga4Cu4 cuboctahedra, corners with eight equivalent Cu(2)U4Ga8 cuboctahedra, corners with two equivalent Cu(3)U4Ga4 tetrahedra, corners with four equivalent Cu(1)U4Ga4 tetrahedra,  an edgeedge with one Ga(1)U4Ga4Cu4 cuboctahedra,  an edgeedge with one Cu(3)U4Ga4 tetrahedra, faces with four equivalent Cu(2)U4Ga8 cuboctahedra, and faces with four equivalent Ga(1)U4Ga4Cu4 cuboctahedra. In the third Cu site, Cu(3) is bonded to four equivalent U(1) and four equivalent Ga(2) atoms to form distorted CuU4Ga4 tetrahedra that share corners with four equivalent Cu(2)U4Ga8 cuboctahedra, corners with eight equivalent Ga(1)U4Ga4Cu4 cuboctahedra, edges with two equivalent Cu(2)U4Ga8 cuboctahedra, edges with four equivalent Cu(3)U4Ga4 tetrahedra, and faces with four equivalent Cu(1)U4Ga4 tetrahedra. There are six inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to two equivalent U(1), two equivalent U(2), four equivalent Cu(2), two equivalent Ga(3), and two equivalent Ga(4) atoms to form GaU4Ga4Cu4 cuboctahedra that share corners with two equivalent Cu(2)U4Ga8 cuboctahedra, corners with eight equivalent Ga(1)U4Ga4Cu4 cuboctahedra, corners with two equivalent Cu(1)U4Ga4 tetrahedra, corners with four equivalent Cu(3)U4Ga4 tetrahedra,  an edgeedge with one Cu(2)U4Ga8 cuboctahedra,  an edgeedge with one Cu(1)U4Ga4 tetrahedra, faces with four equivalent Cu(2)U4Ga8 cuboctahedra, and faces with four equivalent Ga(1)U4Ga4Cu4 cuboctahedra. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to four equivalent U(1), two equivalent Cu(1), two equivalent Cu(3), and one Ga(3) atom. In the third Ga site, Ga(3) is bonded in a 9-coordinate geometry to four equivalent U(1), two equivalent Cu(2), one Ga(2), and two equivalent Ga(1) atoms. In the fourth Ga site, Ga(4) is bonded in a 9-coordinate geometry to four equivalent U(2), two equivalent Cu(2), one Ga(4), and two equivalent Ga(1) atoms. In the fifth Ga site, Ga(3) is bonded in a 9-coordinate geometry to four equivalent U(1), two equivalent Cu(2), one Ga(2), and two equivalent Ga(1) atoms. In the sixth Ga site, Ga(4) is bonded in a 9-coordinate geometry to four equivalent U(2), two equivalent Cu(2), one Ga(4), and two equivalent Ga(1) atoms. is represented by the CIF card [CIF]
data_U3(Ga2Cu)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.093
_cell_length_b   4.093
_cell_length_c   16.073
_cell_angle_alpha   82.685
_cell_angle_beta   82.685
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   264.855
_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  0.998  0.998  0.005  1.0
  U  U1  1  0.336  0.336  0.328  1.0
  U  U2  1  0.667  0.667  0.667  1.0
  Ga  Ga3  1  0.751  0.251  0.499  1.0
  Ga  Ga4  1  0.083  0.583  0.834  1.0
  Ga  Ga5  1  0.458  0.458  0.083  1.0
  Ga  Ga6  1  0.797  0.797  0.406  1.0
  Ga  Ga7  1  0.128  0.128  0.744  1.0
  Ga  Ga8  1  0.875  0.875  0.250  1.0
  Ga  Ga9  1  0.205  0.205  0.590  1.0
  Ga  Ga10  1  0.536  0.536  0.927  1.0
  Cu  Cu11  1  0.917  0.417  0.167  1.0
  Cu  Cu12  1  0.250  0.750  0.500  1.0
  Cu  Cu13  1  0.583  0.083  0.833  1.0
  Cu  Cu14  1  0.417  0.917  0.167  1.0
[/CIF]
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The crystal structure described by U3(CuGa2)4 crystallizes in the tetragonal I-4m2 space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 16-coordinate geometry to two equivalent Cu(1), two equivalent Cu(2), two equivalent Cu(3), two equivalent Ga(1), four equivalent Ga(2), and four equivalent Ga(3) atoms. In the second U site, U(2) is bonded in a 16-coordinate geometry to four equivalent Cu(2), four equivalent Ga(1), and eight equivalent Ga(4) atoms. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to four equivalent U(1) and four equivalent Ga(2) atoms to form distorted CuU4Ga4 tetrahedra that share corners with four equivalent Ga(1)U4Ga4Cu4 cuboctahedra, corners with eight equivalent Cu(2)U4Ga8 cuboctahedra, edges with two equivalent Ga(1)U4Ga4Cu4 cuboctahedra, edges with four equivalent Cu(1)U4Ga4 tetrahedra, and faces with four equivalent Cu(3)U4Ga4 tetrahedra. In the second Cu site, Cu(2) is bonded to two equivalent U(1), two equivalent U(2), two equivalent Ga(3), two equivalent Ga(4), and four equivalent Ga(1) atoms to form distorted CuU4Ga8 cuboctahedra that share corners with two equivalent Ga(1)U4Ga4Cu4 cuboctahedra, corners with eight equivalent Cu(2)U4Ga8 cuboctahedra, corners with two equivalent Cu(3)U4Ga4 tetrahedra, corners with four equivalent Cu(1)U4Ga4 tetrahedra,  an edgeedge with one Ga(1)U4Ga4Cu4 cuboctahedra,  an edgeedge with one Cu(3)U4Ga4 tetrahedra, faces with four equivalent Cu(2)U4Ga8 cuboctahedra, and faces with four equivalent Ga(1)U4Ga4Cu4 cuboctahedra. In the third Cu site, Cu(3) is bonded to four equivalent U(1) and four equivalent Ga(2) atoms to form distorted CuU4Ga4 tetrahedra that share corners with four equivalent Cu(2)U4Ga8 cuboctahedra, corners with eight equivalent Ga(1)U4Ga4Cu4 cuboctahedra, edges with two equivalent Cu(2)U4Ga8 cuboctahedra, edges with four equivalent Cu(3)U4Ga4 tetrahedra, and faces with four equivalent Cu(1)U4Ga4 tetrahedra. There are six inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to two equivalent U(1), two equivalent U(2), four equivalent Cu(2), two equivalent Ga(3), and two equivalent Ga(4) atoms to form GaU4Ga4Cu4 cuboctahedra that share corners with two equivalent Cu(2)U4Ga8 cuboctahedra, corners with eight equivalent Ga(1)U4Ga4Cu4 cuboctahedra, corners with two equivalent Cu(1)U4Ga4 tetrahedra, corners with four equivalent Cu(3)U4Ga4 tetrahedra,  an edgeedge with one Cu(2)U4Ga8 cuboctahedra,  an edgeedge with one Cu(1)U4Ga4 tetrahedra, faces with four equivalent Cu(2)U4Ga8 cuboctahedra, and faces with four equivalent Ga(1)U4Ga4Cu4 cuboctahedra. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to four equivalent U(1), two equivalent Cu(1), two equivalent Cu(3), and one Ga(3) atom. In the third Ga site, Ga(3) is bonded in a 9-coordinate geometry to four equivalent U(1), two equivalent Cu(2), one Ga(2), and two equivalent Ga(1) atoms. In the fourth Ga site, Ga(4) is bonded in a 9-coordinate geometry to four equivalent U(2), two equivalent Cu(2), one Ga(4), and two equivalent Ga(1) atoms. In the fifth Ga site, Ga(3) is bonded in a 9-coordinate geometry to four equivalent U(1), two equivalent Cu(2), one Ga(2), and two equivalent Ga(1) atoms. In the sixth Ga site, Ga(4) is bonded in a 9-coordinate geometry to four equivalent U(2), two equivalent Cu(2), one Ga(4), and two equivalent Ga(1) atoms. is represented by the CIF card [CIF]
data_U3(Ga2Cu)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.093
_cell_length_b   4.093
_cell_length_c   16.073
_cell_angle_alpha   82.685
_cell_angle_beta   82.685
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   264.855
_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  0.998  0.998  0.005  1.0
  U  U1  1  0.336  0.336  0.328  1.0
  U  U2  1  0.667  0.667  0.667  1.0
  Ga  Ga3  1  0.751  0.251  0.499  1.0
  Ga  Ga4  1  0.083  0.583  0.834  1.0
  Ga  Ga5  1  0.458  0.458  0.083  1.0
  Ga  Ga6  1  0.797  0.797  0.406  1.0
  Ga  Ga7  1  0.128  0.128  0.744  1.0
  Ga  Ga8  1  0.875  0.875  0.250  1.0
  Ga  Ga9  1  0.205  0.205  0.590  1.0
  Ga  Ga10  1  0.536  0.536  0.927  1.0
  Cu  Cu11  1  0.917  0.417  0.167  1.0
  Cu  Cu12  1  0.250  0.750  0.500  1.0
  Cu  Cu13  1  0.583  0.083  0.833  1.0
  Cu  Cu14  1  0.417  0.917  0.167  1.0
[/CIF]
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