The material structure described by U2Cu7Al3 crystallizes in the monoclinic P2/m space group. U(1) is bonded in a 6-coordinate geometry to two equivalent Cu(3), two equivalent Cu(4), two equivalent Cu(5), three equivalent Cu(1), and three equivalent Cu(2) atoms. There are five inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 9-coordinate geometry to three equivalent U(1), one Cu(2), two equivalent Cu(4), two equivalent Al(1), and two equivalent Al(2) atoms. In the second Cu site, Cu(2) is bonded in a 12-coordinate geometry to three equivalent U(1), one Cu(1), two equivalent Cu(2), two equivalent Cu(3), two equivalent Cu(5), and two equivalent Al(1) atoms. In the third Cu site, Cu(3) is bonded to four equivalent U(1), two equivalent Cu(5), four equivalent Cu(2), and two equivalent Al(1) atoms to form distorted CuU4Al2Cu6 cuboctahedra that share corners with two equivalent Cu(3)U4Al2Cu6 cuboctahedra, corners with four equivalent Cu(4)U4Al4Cu4 cuboctahedra, edges with four equivalent Cu(5)U4Al2Cu6 cuboctahedra, faces with two equivalent Cu(3)U4Al2Cu6 cuboctahedra, faces with two equivalent Cu(5)U4Al2Cu6 cuboctahedra, and faces with two equivalent Cu(4)U4Al4Cu4 cuboctahedra. In the fourth Cu site, Cu(4) is bonded to four equivalent U(1), four equivalent Cu(1), two equivalent Al(1), and two equivalent Al(2) atoms to form distorted CuU4Al4Cu4 cuboctahedra that share corners with two equivalent Cu(4)U4Al4Cu4 cuboctahedra, corners with four equivalent Cu(3)U4Al2Cu6 cuboctahedra, corners with four equivalent Al(2)Cu6 cuboctahedra, corners with six equivalent Cu(5)U4Al2Cu6 cuboctahedra, edges with two equivalent Cu(5)U4Al2Cu6 cuboctahedra, edges with two equivalent Al(2)Cu6 cuboctahedra, faces with two equivalent Cu(3)U4Al2Cu6 cuboctahedra, and faces with two equivalent Cu(4)U4Al4Cu4 cuboctahedra. In the fifth Cu site, Cu(5) is bonded to four equivalent U(1), two equivalent Cu(3), four equivalent Cu(2), and two equivalent Al(1) atoms to form distorted CuU4Al2Cu6 cuboctahedra that share corners with two equivalent Cu(5)U4Al2Cu6 cuboctahedra, corners with six equivalent Cu(4)U4Al4Cu4 cuboctahedra, edges with two equivalent Cu(4)U4Al4Cu4 cuboctahedra, edges with four equivalent Cu(3)U4Al2Cu6 cuboctahedra, faces with two equivalent Cu(3)U4Al2Cu6 cuboctahedra, and faces with two equivalent Cu(5)U4Al2Cu6 cuboctahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 7-coordinate geometry to one Cu(3), one Cu(4), one Cu(5), two equivalent Cu(1), and two equivalent Cu(2) atoms. In the second Al site, Al(2) is bonded to two equivalent Cu(4) and four equivalent Cu(1) atoms to form distorted AlCu6 cuboctahedra that share corners with two equivalent Al(2)Cu6 cuboctahedra, corners with four equivalent Cu(4)U4Al4Cu4 cuboctahedra, edges with two equivalent Cu(4)U4Al4Cu4 cuboctahedra, and edges with two equivalent Al(2)Cu6 cuboctahedra. is represented by the CIF card [CIF]
data_U2Al3Cu7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.156
_cell_length_b   5.075
_cell_length_c   8.803
_cell_angle_alpha   91.324
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   185.592
_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  0.004  0.999  1.0
  U  U1  1  0.000  0.496  0.501  1.0
  Al  Al2  1  0.500  0.511  0.993  1.0
  Al  Al3  1  0.500  0.989  0.507  1.0
  Al  Al4  1  0.500  0.250  0.250  1.0
  Cu  Cu5  1  0.000  0.994  0.334  1.0
  Cu  Cu6  1  0.000  0.499  0.830  1.0
  Cu  Cu7  1  0.000  0.506  0.166  1.0
  Cu  Cu8  1  0.000  0.001  0.670  1.0
  Cu  Cu9  1  0.500  0.750  0.750  1.0
  Cu  Cu10  1  0.500  0.750  0.250  1.0
  Cu  Cu11  1  0.500  0.250  0.750  1.0
[/CIF]
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The material structure described by U2Cu7Al3 crystallizes in the monoclinic P2/m space group. U(1) is bonded in a 6-coordinate geometry to two equivalent Cu(3), two equivalent Cu(4), two equivalent Cu(5), three equivalent Cu(1), and three equivalent Cu(2) atoms. There are five inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 9-coordinate geometry to three equivalent U(1), one Cu(2), two equivalent Cu(4), two equivalent Al(1), and two equivalent Al(2) atoms. In the second Cu site, Cu(2) is bonded in a 12-coordinate geometry to three equivalent U(1), one Cu(1), two equivalent Cu(2), two equivalent Cu(3), two equivalent Cu(5), and two equivalent Al(1) atoms. In the third Cu site, Cu(3) is bonded to four equivalent U(1), two equivalent Cu(5), four equivalent Cu(2), and two equivalent Al(1) atoms to form distorted CuU4Al2Cu6 cuboctahedra that share corners with two equivalent Cu(3)U4Al2Cu6 cuboctahedra, corners with four equivalent Cu(4)U4Al4Cu4 cuboctahedra, edges with four equivalent Cu(5)U4Al2Cu6 cuboctahedra, faces with two equivalent Cu(3)U4Al2Cu6 cuboctahedra, faces with two equivalent Cu(5)U4Al2Cu6 cuboctahedra, and faces with two equivalent Cu(4)U4Al4Cu4 cuboctahedra. In the fourth Cu site, Cu(4) is bonded to four equivalent U(1), four equivalent Cu(1), two equivalent Al(1), and two equivalent Al(2) atoms to form distorted CuU4Al4Cu4 cuboctahedra that share corners with two equivalent Cu(4)U4Al4Cu4 cuboctahedra, corners with four equivalent Cu(3)U4Al2Cu6 cuboctahedra, corners with four equivalent Al(2)Cu6 cuboctahedra, corners with six equivalent Cu(5)U4Al2Cu6 cuboctahedra, edges with two equivalent Cu(5)U4Al2Cu6 cuboctahedra, edges with two equivalent Al(2)Cu6 cuboctahedra, faces with two equivalent Cu(3)U4Al2Cu6 cuboctahedra, and faces with two equivalent Cu(4)U4Al4Cu4 cuboctahedra. In the fifth Cu site, Cu(5) is bonded to four equivalent U(1), two equivalent Cu(3), four equivalent Cu(2), and two equivalent Al(1) atoms to form distorted CuU4Al2Cu6 cuboctahedra that share corners with two equivalent Cu(5)U4Al2Cu6 cuboctahedra, corners with six equivalent Cu(4)U4Al4Cu4 cuboctahedra, edges with two equivalent Cu(4)U4Al4Cu4 cuboctahedra, edges with four equivalent Cu(3)U4Al2Cu6 cuboctahedra, faces with two equivalent Cu(3)U4Al2Cu6 cuboctahedra, and faces with two equivalent Cu(5)U4Al2Cu6 cuboctahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 7-coordinate geometry to one Cu(3), one Cu(4), one Cu(5), two equivalent Cu(1), and two equivalent Cu(2) atoms. In the second Al site, Al(2) is bonded to two equivalent Cu(4) and four equivalent Cu(1) atoms to form distorted AlCu6 cuboctahedra that share corners with two equivalent Al(2)Cu6 cuboctahedra, corners with four equivalent Cu(4)U4Al4Cu4 cuboctahedra, edges with two equivalent Cu(4)U4Al4Cu4 cuboctahedra, and edges with two equivalent Al(2)Cu6 cuboctahedra. is represented by the CIF card [CIF]
data_U2Al3Cu7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.156
_cell_length_b   5.075
_cell_length_c   8.803
_cell_angle_alpha   91.324
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   185.592
_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  0.004  0.999  1.0
  U  U1  1  0.000  0.496  0.501  1.0
  Al  Al2  1  0.500  0.511  0.993  1.0
  Al  Al3  1  0.500  0.989  0.507  1.0
  Al  Al4  1  0.500  0.250  0.250  1.0
  Cu  Cu5  1  0.000  0.994  0.334  1.0
  Cu  Cu6  1  0.000  0.499  0.830  1.0
  Cu  Cu7  1  0.000  0.506  0.166  1.0
  Cu  Cu8  1  0.000  0.001  0.670  1.0
  Cu  Cu9  1  0.500  0.750  0.750  1.0
  Cu  Cu10  1  0.500  0.750  0.250  1.0
  Cu  Cu11  1  0.500  0.250  0.750  1.0
[/CIF]
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