The compound described by LaAs2 crystallizes in the monoclinic Cc space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to one As(1), one As(2), one As(5), one As(7), one As(8), two equivalent As(3), and two equivalent As(6) atoms. In the second La site, La(2) is bonded in a 9-coordinate geometry to one As(1), one As(2), one As(3), one As(5), one As(8), two equivalent As(4), and two equivalent As(7) atoms. In the third La site, La(3) is bonded in a 9-coordinate geometry to one As(1), one As(2), one As(5), one As(6), one As(8), two equivalent As(3), and two equivalent As(4) atoms. In the fourth La site, La(4) is bonded in a 9-coordinate geometry to one As(1), one As(2), one As(4), one As(5), one As(8), two equivalent As(6), and two equivalent As(7) atoms. There are eight inequivalent As sites. In the first As site, As(1) is bonded in a 6-coordinate geometry to one La(1), one La(2), one La(3), one La(4), one As(2), and one As(5) atom. In the second As site, As(2) is bonded in a 6-coordinate geometry to one La(1), one La(2), one La(3), one La(4), one As(1), and one As(4) atom. In the third As site, As(3) is bonded in a 6-coordinate geometry to one La(2), two equivalent La(1), two equivalent La(3), and one As(5) atom. In the fourth As site, As(4) is bonded in a 6-coordinate geometry to one La(4), two equivalent La(2), two equivalent La(3), and one As(2) atom. In the fifth As site, As(5) is bonded in a 6-coordinate geometry to one La(1), one La(2), one La(3), one La(4), one As(1), and one As(3) atom. In the sixth As site, As(6) is bonded to one La(3), two equivalent La(1), two equivalent La(4), and one As(8) atom to form a mixture of distorted corner, edge, and face-sharing AsLa5As octahedra. The corner-sharing octahedral tilt angles range from 38-51°. In the seventh As site, As(7) is bonded to one La(1), two equivalent La(2), two equivalent La(4), and one As(8) atom to form a mixture of distorted corner, edge, and face-sharing AsLa5As octahedra. The corner-sharing octahedral tilt angles range from 39-47°. In the eighth As site, As(8) is bonded in a 6-coordinate geometry to one La(1), one La(2), one La(3), one La(4), one As(6), and one As(7) atom. is represented by the CIF file [CIF]
data_LaAs2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.151
_cell_length_b   9.201
_cell_length_c   9.746
_cell_angle_alpha   118.136
_cell_angle_beta   117.973
_cell_angle_gamma   90.051
_symmetry_Int_Tables_number   1
_cell_volume   612.498
_cell_formula_units_Z   8
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  0.673  0.750  0.081  1.0
  La  La1  1  0.092  0.669  0.919  1.0
  La  La2  1  0.892  0.273  0.917  1.0
  La  La3  1  0.475  0.356  0.083  1.0
  La  La4  1  0.436  0.115  0.443  1.0
  La  La5  1  0.492  0.671  0.557  1.0
  La  La6  1  0.014  0.297  0.395  1.0
  La  La7  1  0.118  0.902  0.605  1.0
  As  As8  1  0.871  0.874  0.745  1.0
  As  As9  1  0.626  0.129  0.255  1.0
  As  As10  1  0.746  0.998  0.949  1.0
  As  As11  1  0.297  0.048  0.050  1.0
  As  As12  1  0.461  0.732  0.255  1.0
  As  As13  1  0.706  0.477  0.745  1.0
  As  As14  1  0.505  0.070  0.762  1.0
  As  As15  1  0.243  0.307  0.238  1.0
  As  As16  1  0.742  0.948  0.504  1.0
  As  As17  1  0.738  0.444  0.496  1.0
  As  As18  1  0.299  0.662  0.744  1.0
  As  As19  1  0.055  0.919  0.256  1.0
  As  As20  1  0.116  0.289  0.754  1.0
  As  As21  1  0.861  0.536  0.246  1.0
  As  As22  1  0.358  0.403  0.747  1.0
  As  As23  1  0.111  0.656  0.253  1.0
[/CIF]
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The compound described by LaAs2 crystallizes in the monoclinic Cc space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to one As(1), one As(2), one As(5), one As(7), one As(8), two equivalent As(3), and two equivalent As(6) atoms. In the second La site, La(2) is bonded in a 9-coordinate geometry to one As(1), one As(2), one As(3), one As(5), one As(8), two equivalent As(4), and two equivalent As(7) atoms. In the third La site, La(3) is bonded in a 9-coordinate geometry to one As(1), one As(2), one As(5), one As(6), one As(8), two equivalent As(3), and two equivalent As(4) atoms. In the fourth La site, La(4) is bonded in a 9-coordinate geometry to one As(1), one As(2), one As(4), one As(5), one As(8), two equivalent As(6), and two equivalent As(7) atoms. There are eight inequivalent As sites. In the first As site, As(1) is bonded in a 6-coordinate geometry to one La(1), one La(2), one La(3), one La(4), one As(2), and one As(5) atom. In the second As site, As(2) is bonded in a 6-coordinate geometry to one La(1), one La(2), one La(3), one La(4), one As(1), and one As(4) atom. In the third As site, As(3) is bonded in a 6-coordinate geometry to one La(2), two equivalent La(1), two equivalent La(3), and one As(5) atom. In the fourth As site, As(4) is bonded in a 6-coordinate geometry to one La(4), two equivalent La(2), two equivalent La(3), and one As(2) atom. In the fifth As site, As(5) is bonded in a 6-coordinate geometry to one La(1), one La(2), one La(3), one La(4), one As(1), and one As(3) atom. In the sixth As site, As(6) is bonded to one La(3), two equivalent La(1), two equivalent La(4), and one As(8) atom to form a mixture of distorted corner, edge, and face-sharing AsLa5As octahedra. The corner-sharing octahedral tilt angles range from 38-51°. In the seventh As site, As(7) is bonded to one La(1), two equivalent La(2), two equivalent La(4), and one As(8) atom to form a mixture of distorted corner, edge, and face-sharing AsLa5As octahedra. The corner-sharing octahedral tilt angles range from 39-47°. In the eighth As site, As(8) is bonded in a 6-coordinate geometry to one La(1), one La(2), one La(3), one La(4), one As(6), and one As(7) atom. is represented by the CIF file [CIF]
data_LaAs2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.151
_cell_length_b   9.201
_cell_length_c   9.746
_cell_angle_alpha   118.136
_cell_angle_beta   117.973
_cell_angle_gamma   90.051
_symmetry_Int_Tables_number   1
_cell_volume   612.498
_cell_formula_units_Z   8
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  0.673  0.750  0.081  1.0
  La  La1  1  0.092  0.669  0.919  1.0
  La  La2  1  0.892  0.273  0.917  1.0
  La  La3  1  0.475  0.356  0.083  1.0
  La  La4  1  0.436  0.115  0.443  1.0
  La  La5  1  0.492  0.671  0.557  1.0
  La  La6  1  0.014  0.297  0.395  1.0
  La  La7  1  0.118  0.902  0.605  1.0
  As  As8  1  0.871  0.874  0.745  1.0
  As  As9  1  0.626  0.129  0.255  1.0
  As  As10  1  0.746  0.998  0.949  1.0
  As  As11  1  0.297  0.048  0.050  1.0
  As  As12  1  0.461  0.732  0.255  1.0
  As  As13  1  0.706  0.477  0.745  1.0
  As  As14  1  0.505  0.070  0.762  1.0
  As  As15  1  0.243  0.307  0.238  1.0
  As  As16  1  0.742  0.948  0.504  1.0
  As  As17  1  0.738  0.444  0.496  1.0
  As  As18  1  0.299  0.662  0.744  1.0
  As  As19  1  0.055  0.919  0.256  1.0
  As  As20  1  0.116  0.289  0.754  1.0
  As  As21  1  0.861  0.536  0.246  1.0
  As  As22  1  0.358  0.403  0.747  1.0
  As  As23  1  0.111  0.656  0.253  1.0
[/CIF]
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