The crystal structure described by LaCu2Al4Si crystallizes in the orthorhombic Pmm2 space group. La(1) is bonded in a 16-coordinate geometry to four equivalent Cu(2), two equivalent Al(1), two equivalent Al(2), two equivalent Al(3), four equivalent Al(4), and two equivalent Si(1) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted body-centered cubic geometry to two equivalent Al(1), two equivalent Al(2), two equivalent Al(3), and two equivalent Si(1) atoms. In the second Cu site, Cu(2) is bonded in a 9-coordinate geometry to four equivalent La(1), one Al(4), two equivalent Al(3), and two equivalent Si(1) atoms. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded in a 2-coordinate geometry to two equivalent La(1), two equivalent Cu(1), and four equivalent Al(2) atoms. In the second Al site, Al(2) is bonded in a 11-coordinate geometry to two equivalent La(1), two equivalent Cu(1), two equivalent Al(4), four equivalent Al(1), and one Si(1) atom. In the third Al site, Al(3) is bonded to two equivalent La(1), two equivalent Cu(1), two equivalent Cu(2), and four equivalent Si(1) atoms to form a mixture of distorted corner and face-sharing AlLa2Cu4Si4 tetrahedra. In the fourth Al site, Al(4) is bonded in a distorted single-bond geometry to four equivalent La(1), one Cu(2), and two equivalent Al(2) atoms. Si(1) is bonded in a 11-coordinate geometry to two equivalent La(1), two equivalent Cu(1), two equivalent Cu(2), one Al(2), and four equivalent Al(3) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_LaAl4Cu2Si
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.256
_cell_length_b   4.212
_cell_length_c   7.960
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   142.689
_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  0.000  0.000  0.004  1.0
  Al  Al1  1  0.500  0.000  0.665  1.0
  Al  Al2  1  0.000  0.500  0.659  1.0
  Al  Al3  1  0.500  0.000  0.327  1.0
  Al  Al4  1  0.500  0.500  0.864  1.0
  Cu  Cu5  1  0.000  0.000  0.494  1.0
  Cu  Cu6  1  0.500  0.500  0.165  1.0
  Si  Si7  1  0.000  0.500  0.322  1.0
[/CIF]
.
The crystal structure described by LaCu2Al4Si crystallizes in the orthorhombic Pmm2 space group. La(1) is bonded in a 16-coordinate geometry to four equivalent Cu(2), two equivalent Al(1), two equivalent Al(2), two equivalent Al(3), four equivalent Al(4), and two equivalent Si(1) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted body-centered cubic geometry to two equivalent Al(1), two equivalent Al(2), two equivalent Al(3), and two equivalent Si(1) atoms. In the second Cu site, Cu(2) is bonded in a 9-coordinate geometry to four equivalent La(1), one Al(4), two equivalent Al(3), and two equivalent Si(1) atoms. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded in a 2-coordinate geometry to two equivalent La(1), two equivalent Cu(1), and four equivalent Al(2) atoms. In the second Al site, Al(2) is bonded in a 11-coordinate geometry to two equivalent La(1), two equivalent Cu(1), two equivalent Al(4), four equivalent Al(1), and one Si(1) atom. In the third Al site, Al(3) is bonded to two equivalent La(1), two equivalent Cu(1), two equivalent Cu(2), and four equivalent Si(1) atoms to form a mixture of distorted corner and face-sharing AlLa2Cu4Si4 tetrahedra. In the fourth Al site, Al(4) is bonded in a distorted single-bond geometry to four equivalent La(1), one Cu(2), and two equivalent Al(2) atoms. Si(1) is bonded in a 11-coordinate geometry to two equivalent La(1), two equivalent Cu(1), two equivalent Cu(2), one Al(2), and four equivalent Al(3) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_LaAl4Cu2Si
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.256
_cell_length_b   4.212
_cell_length_c   7.960
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   142.689
_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  0.000  0.000  0.004  1.0
  Al  Al1  1  0.500  0.000  0.665  1.0
  Al  Al2  1  0.000  0.500  0.659  1.0
  Al  Al3  1  0.500  0.000  0.327  1.0
  Al  Al4  1  0.500  0.500  0.864  1.0
  Cu  Cu5  1  0.000  0.000  0.494  1.0
  Cu  Cu6  1  0.500  0.500  0.165  1.0
  Si  Si7  1  0.000  0.500  0.322  1.0
[/CIF]
.