The material described by La4Cu5As8 crystallizes in the orthorhombic Amm2 space group. There are four inequivalent La sites. In the first La site, La(1) is bonded to four equivalent Cu(1), two equivalent As(3), two equivalent As(4), and four equivalent As(5) atoms to form distorted LaCu4As8 cuboctahedra that share corners with four equivalent La(1)Cu4As8 cuboctahedra, corners with eight equivalent Cu(1)La4As4 tetrahedra, edges with four equivalent Cu(1)La4As4 tetrahedra, and faces with four equivalent La(2)Cu4As8 cuboctahedra. In the second La site, La(2) is bonded to four equivalent Cu(1), two equivalent As(3), two equivalent As(4), and four equivalent As(5) atoms to form distorted LaCu4As8 cuboctahedra that share corners with four equivalent La(2)Cu4As8 cuboctahedra, corners with eight equivalent Cu(1)La4As4 tetrahedra, edges with four equivalent Cu(1)La4As4 tetrahedra, and faces with four equivalent La(1)Cu4As8 cuboctahedra. In the third La site, La(3) is bonded in a 14-coordinate geometry to two equivalent Cu(2), four equivalent Cu(1), two equivalent As(1), two equivalent As(2), and four equivalent As(5) atoms. In the fourth La site, La(4) is bonded in a 14-coordinate geometry to two equivalent Cu(2), four equivalent Cu(1), two equivalent As(1), two equivalent As(2), and four equivalent As(5) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one La(1), one La(2), one La(3), one La(4), one As(1), one As(2), one As(3), and one As(4) atom to form distorted CuLa4As4 tetrahedra that share corners with two equivalent La(1)Cu4As8 cuboctahedra, corners with two equivalent La(2)Cu4As8 cuboctahedra,  an edgeedge with one La(1)Cu4As8 cuboctahedra,  an edgeedge with one La(2)Cu4As8 cuboctahedra, edges with four equivalent Cu(1)La4As4 tetrahedra, and faces with four equivalent Cu(1)La4As4 tetrahedra. In the second Cu site, Cu(2) is bonded in a 9-coordinate geometry to two equivalent La(3), two equivalent La(4), one As(2), and four equivalent As(5) atoms. There are five inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to two equivalent La(3), two equivalent La(4), and four equivalent Cu(1) atoms. In the second As site, As(2) is bonded in a 9-coordinate geometry to two equivalent La(3), two equivalent La(4), one Cu(2), and four equivalent Cu(1) atoms. In the third As site, As(3) is bonded in a 8-coordinate geometry to two equivalent La(1), two equivalent La(2), and four equivalent Cu(1) atoms. In the fourth As site, As(4) is bonded in a 8-coordinate geometry to two equivalent La(1), two equivalent La(2), and four equivalent Cu(1) atoms. In the fifth As site, As(5) is bonded in a 7-coordinate geometry to one La(1), one La(2), one La(3), one La(4), one Cu(2), and two equivalent As(5) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_La4Cu5As8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.546
_cell_length_b   10.546
_cell_length_c   5.845
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   148.308
_symmetry_Int_Tables_number   1
_cell_volume   341.546
_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  0.620  0.380  0.000  1.0
  La  La1  1  0.122  0.878  0.500  1.0
  La  La2  1  0.876  0.124  0.500  1.0
  La  La3  1  0.379  0.621  0.000  1.0
  Cu  Cu4  1  0.995  0.495  0.244  1.0
  Cu  Cu5  1  0.505  0.005  0.756  1.0
  Cu  Cu6  1  0.505  0.005  0.244  1.0
  Cu  Cu7  1  0.995  0.495  0.756  1.0
  Cu  Cu8  1  0.441  0.559  0.500  1.0
  As  As9  1  0.823  0.177  0.000  1.0
  As  As10  1  0.320  0.680  0.500  1.0
  As  As11  1  0.679  0.321  0.500  1.0
  As  As12  1  0.179  0.821  0.000  1.0
  As  As13  1  0.778  0.777  0.765  1.0
  As  As14  1  0.223  0.222  0.235  1.0
  As  As15  1  0.778  0.777  0.235  1.0
  As  As16  1  0.223  0.222  0.765  1.0
[/CIF]
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The material described by La4Cu5As8 crystallizes in the orthorhombic Amm2 space group. There are four inequivalent La sites. In the first La site, La(1) is bonded to four equivalent Cu(1), two equivalent As(3), two equivalent As(4), and four equivalent As(5) atoms to form distorted LaCu4As8 cuboctahedra that share corners with four equivalent La(1)Cu4As8 cuboctahedra, corners with eight equivalent Cu(1)La4As4 tetrahedra, edges with four equivalent Cu(1)La4As4 tetrahedra, and faces with four equivalent La(2)Cu4As8 cuboctahedra. In the second La site, La(2) is bonded to four equivalent Cu(1), two equivalent As(3), two equivalent As(4), and four equivalent As(5) atoms to form distorted LaCu4As8 cuboctahedra that share corners with four equivalent La(2)Cu4As8 cuboctahedra, corners with eight equivalent Cu(1)La4As4 tetrahedra, edges with four equivalent Cu(1)La4As4 tetrahedra, and faces with four equivalent La(1)Cu4As8 cuboctahedra. In the third La site, La(3) is bonded in a 14-coordinate geometry to two equivalent Cu(2), four equivalent Cu(1), two equivalent As(1), two equivalent As(2), and four equivalent As(5) atoms. In the fourth La site, La(4) is bonded in a 14-coordinate geometry to two equivalent Cu(2), four equivalent Cu(1), two equivalent As(1), two equivalent As(2), and four equivalent As(5) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one La(1), one La(2), one La(3), one La(4), one As(1), one As(2), one As(3), and one As(4) atom to form distorted CuLa4As4 tetrahedra that share corners with two equivalent La(1)Cu4As8 cuboctahedra, corners with two equivalent La(2)Cu4As8 cuboctahedra,  an edgeedge with one La(1)Cu4As8 cuboctahedra,  an edgeedge with one La(2)Cu4As8 cuboctahedra, edges with four equivalent Cu(1)La4As4 tetrahedra, and faces with four equivalent Cu(1)La4As4 tetrahedra. In the second Cu site, Cu(2) is bonded in a 9-coordinate geometry to two equivalent La(3), two equivalent La(4), one As(2), and four equivalent As(5) atoms. There are five inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to two equivalent La(3), two equivalent La(4), and four equivalent Cu(1) atoms. In the second As site, As(2) is bonded in a 9-coordinate geometry to two equivalent La(3), two equivalent La(4), one Cu(2), and four equivalent Cu(1) atoms. In the third As site, As(3) is bonded in a 8-coordinate geometry to two equivalent La(1), two equivalent La(2), and four equivalent Cu(1) atoms. In the fourth As site, As(4) is bonded in a 8-coordinate geometry to two equivalent La(1), two equivalent La(2), and four equivalent Cu(1) atoms. In the fifth As site, As(5) is bonded in a 7-coordinate geometry to one La(1), one La(2), one La(3), one La(4), one Cu(2), and two equivalent As(5) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_La4Cu5As8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.546
_cell_length_b   10.546
_cell_length_c   5.845
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   148.308
_symmetry_Int_Tables_number   1
_cell_volume   341.546
_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  0.620  0.380  0.000  1.0
  La  La1  1  0.122  0.878  0.500  1.0
  La  La2  1  0.876  0.124  0.500  1.0
  La  La3  1  0.379  0.621  0.000  1.0
  Cu  Cu4  1  0.995  0.495  0.244  1.0
  Cu  Cu5  1  0.505  0.005  0.756  1.0
  Cu  Cu6  1  0.505  0.005  0.244  1.0
  Cu  Cu7  1  0.995  0.495  0.756  1.0
  Cu  Cu8  1  0.441  0.559  0.500  1.0
  As  As9  1  0.823  0.177  0.000  1.0
  As  As10  1  0.320  0.680  0.500  1.0
  As  As11  1  0.679  0.321  0.500  1.0
  As  As12  1  0.179  0.821  0.000  1.0
  As  As13  1  0.778  0.777  0.765  1.0
  As  As14  1  0.223  0.222  0.235  1.0
  As  As15  1  0.778  0.777  0.235  1.0
  As  As16  1  0.223  0.222  0.765  1.0
[/CIF]
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