The crystal structure described by LaCu4Al crystallizes in the orthorhombic Cmmm space group. La(1) is bonded in a 18-coordinate geometry to six equivalent Cu(1), eight equivalent Cu(2), and four equivalent Al(1) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 9-coordinate geometry to three equivalent La(1), four equivalent Cu(2), and two equivalent Al(1) atoms. In the second Cu site, Cu(2) is bonded to four equivalent La(1), two equivalent Cu(2), four equivalent Cu(1), and two equivalent Al(1) atoms to form distorted CuLa4Al2Cu6 cuboctahedra that share corners with four equivalent Al(1)La4Cu8 cuboctahedra, corners with twelve equivalent Cu(2)La4Al2Cu6 cuboctahedra, edges with four equivalent Al(1)La4Cu8 cuboctahedra, edges with six equivalent Cu(2)La4Al2Cu6 cuboctahedra, faces with four equivalent Al(1)La4Cu8 cuboctahedra, and faces with six equivalent Cu(2)La4Al2Cu6 cuboctahedra. Al(1) is bonded to four equivalent La(1), four equivalent Cu(1), and four equivalent Cu(2) atoms to form distorted AlLa4Cu8 cuboctahedra that share corners with eight equivalent Cu(2)La4Al2Cu6 cuboctahedra, corners with eight equivalent Al(1)La4Cu8 cuboctahedra, edges with two equivalent Al(1)La4Cu8 cuboctahedra, edges with eight equivalent Cu(2)La4Al2Cu6 cuboctahedra, faces with two equivalent Al(1)La4Cu8 cuboctahedra, and faces with eight equivalent Cu(2)La4Al2Cu6 cuboctahedra. is represented by the CIF card [CIF]
data_LaAlCu4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.153
_cell_length_b   5.153
_cell_length_c   4.161
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   118.579
_symmetry_Int_Tables_number   1
_cell_volume   97.022
_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  0.500  0.500  0.000  1.0
  Al  Al1  1  0.000  0.000  0.500  1.0
  Cu  Cu2  1  0.166  0.834  0.000  1.0
  Cu  Cu3  1  0.834  0.166  0.000  1.0
  Cu  Cu4  1  0.000  0.500  0.500  1.0
  Cu  Cu5  1  0.500  0.000  0.500  1.0
[/CIF]
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The crystal structure described by LaCu4Al crystallizes in the orthorhombic Cmmm space group. La(1) is bonded in a 18-coordinate geometry to six equivalent Cu(1), eight equivalent Cu(2), and four equivalent Al(1) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 9-coordinate geometry to three equivalent La(1), four equivalent Cu(2), and two equivalent Al(1) atoms. In the second Cu site, Cu(2) is bonded to four equivalent La(1), two equivalent Cu(2), four equivalent Cu(1), and two equivalent Al(1) atoms to form distorted CuLa4Al2Cu6 cuboctahedra that share corners with four equivalent Al(1)La4Cu8 cuboctahedra, corners with twelve equivalent Cu(2)La4Al2Cu6 cuboctahedra, edges with four equivalent Al(1)La4Cu8 cuboctahedra, edges with six equivalent Cu(2)La4Al2Cu6 cuboctahedra, faces with four equivalent Al(1)La4Cu8 cuboctahedra, and faces with six equivalent Cu(2)La4Al2Cu6 cuboctahedra. Al(1) is bonded to four equivalent La(1), four equivalent Cu(1), and four equivalent Cu(2) atoms to form distorted AlLa4Cu8 cuboctahedra that share corners with eight equivalent Cu(2)La4Al2Cu6 cuboctahedra, corners with eight equivalent Al(1)La4Cu8 cuboctahedra, edges with two equivalent Al(1)La4Cu8 cuboctahedra, edges with eight equivalent Cu(2)La4Al2Cu6 cuboctahedra, faces with two equivalent Al(1)La4Cu8 cuboctahedra, and faces with eight equivalent Cu(2)La4Al2Cu6 cuboctahedra. is represented by the CIF card [CIF]
data_LaAlCu4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.153
_cell_length_b   5.153
_cell_length_c   4.161
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   118.579
_symmetry_Int_Tables_number   1
_cell_volume   97.022
_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  0.500  0.500  0.000  1.0
  Al  Al1  1  0.000  0.000  0.500  1.0
  Cu  Cu2  1  0.166  0.834  0.000  1.0
  Cu  Cu3  1  0.834  0.166  0.000  1.0
  Cu  Cu4  1  0.000  0.500  0.500  1.0
  Cu  Cu5  1  0.500  0.000  0.500  1.0
[/CIF]
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