data_LaCuAs
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.71
_cell_length_b   4.71
_cell_length_c   4.71
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   LaCuAs
_chemical_formula_sum   'La1 Cu1 As1'
_cell_volume   74.12
_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  La2  1  0.33  0.33  0.33  1.0
  Cu  Cu1  1  0.0  0.0  0.0  1.0
  As  As0  1  0.67  0.67  0.67  1.0

data_LaCuAs
_symmetry_space_group_name_H-M   R3m
_cell_length_a   4.71
_cell_length_b   4.71
_cell_length_c   11.55
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   LaCuAs
_chemical_formula_sum   'La3 Cu3 As3'
_cell_volume   222.35
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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  3  0.0  0.0  0.67  1.0
  Cu  Cu1  3  0.0  0.0  0.0  1.0
  As  As2  3  0.0  0.0  0.33  1.0

La Cu As
LaCuAs crystallizes in the trigonal R3m space group. La(1) is bonded to four equivalent Cu(1) and four equivalent As(1) atoms to form distorted LaCu4As4 hexagonal bipyramids that share corners with six equivalent Cu(1)La4As3 hexagonal pyramids, corners with six equivalent As(1)La4Cu3 hexagonal pyramids, edges with twelve equivalent La(1)Cu4As4 hexagonal bipyramids, edges with three equivalent Cu(1)La4As3 hexagonal pyramids, and edges with three equivalent As(1)La4Cu3 hexagonal pyramids. There are three shorter (2.72 Å) and one longer (3.86 Å) La(1)-Cu(1) bond length. There are three shorter (2.72 Å) and one longer (3.85 Å) La(1)-As(1) bond length. Cu(1) is bonded to four equivalent La(1) and three equivalent As(1) atoms to form CuLa4As3 hexagonal pyramids that share corners with six equivalent La(1)Cu4As4 hexagonal bipyramids, corners with four equivalent As(1)La4Cu3 hexagonal pyramids, corners with six equivalent Cu(1)La4As3 hexagonal pyramids, edges with three equivalent La(1)Cu4As4 hexagonal bipyramids, edges with six equivalent Cu(1)La4As3 hexagonal pyramids, and edges with six equivalent As(1)La4Cu3 hexagonal pyramids. All Cu(1)-As(1) bond lengths are 2.72 Å. As(1) is bonded to four equivalent La(1) and three equivalent Cu(1) atoms to form distorted AsLa4Cu3 hexagonal pyramids that share corners with six equivalent La(1)Cu4As4 hexagonal bipyramids, corners with four equivalent Cu(1)La4As3 hexagonal pyramids, corners with six equivalent As(1)La4Cu3 hexagonal pyramids, edges with three equivalent La(1)Cu4As4 hexagonal bipyramids, edges with six equivalent Cu(1)La4As3 hexagonal pyramids, and edges with six equivalent As(1)La4Cu3 hexagonal pyramids.