The material structure described by La(ErS2)3 crystallizes in the monoclinic P2_1/m space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded to one S(2), one S(5), two equivalent S(4), and three equivalent S(3) atoms to form distorted ErS7 pentagonal bipyramids that share  a cornercorner with one Er(2)S6 octahedra, corners with two equivalent Er(3)S6 octahedra, edges with two equivalent Er(2)S6 octahedra, and edges with four equivalent Er(1)S7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 39-51°. In the second Er site, Er(2) is bonded to one S(3), two equivalent S(5), and three equivalent S(1) atoms to form ErS6 octahedra that share corners with three equivalent Er(3)S6 octahedra,  a cornercorner with one Er(1)S7 pentagonal bipyramid, edges with four equivalent Er(2)S6 octahedra, and edges with two equivalent Er(1)S7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 53-63°. In the third Er site, Er(3) is bonded to one S(1), two equivalent S(2), and three equivalent S(6) atoms to form ErS6 octahedra that share corners with three equivalent Er(2)S6 octahedra, corners with two equivalent Er(1)S7 pentagonal bipyramids, and edges with four equivalent Er(3)S6 octahedra. The corner-sharing octahedral tilt angles range from 53-63°. La(1) is bonded in a 8-coordinate geometry to one S(2), two equivalent S(5), two equivalent S(6), and three equivalent S(4) atoms. There are six inequivalent S sites. In the first S site, S(1) is bonded in a rectangular see-saw-like geometry to one Er(3) and three equivalent Er(2) atoms. In the second S site, S(2) is bonded to one Er(1), two equivalent Er(3), and one La(1) atom to form distorted SLaEr3 trigonal pyramids that share corners with two equivalent S(6)La2Er3 square pyramids, corners with three equivalent S(3)Er4 tetrahedra,  a cornercorner with one S(4)La3Er2 trigonal bipyramid, corners with three equivalent S(5)La2Er3 trigonal bipyramids, corners with two equivalent S(2)LaEr3 trigonal pyramids, edges with three equivalent S(6)La2Er3 square pyramids, and edges with two equivalent S(4)La3Er2 trigonal bipyramids. In the third S site, S(3) is bonded to one Er(2) and three equivalent Er(1) atoms to form distorted SEr4 tetrahedra that share corners with two equivalent S(3)Er4 tetrahedra,  a cornercorner with one S(5)La2Er3 trigonal bipyramid, corners with four equivalent S(4)La3Er2 trigonal bipyramids, corners with three equivalent S(2)LaEr3 trigonal pyramids, edges with two equivalent S(3)Er4 tetrahedra,  an edgeedge with one S(4)La3Er2 trigonal bipyramid, and edges with two equivalent S(5)La2Er3 trigonal bipyramids. In the fourth S site, S(4) is bonded to two equivalent Er(1) and three equivalent La(1) atoms to form distorted SLa3Er2 trigonal bipyramids that share corners with four equivalent S(6)La2Er3 square pyramids, corners with four equivalent S(3)Er4 tetrahedra, corners with two equivalent S(5)La2Er3 trigonal bipyramids,  a cornercorner with one S(2)LaEr3 trigonal pyramid,  an edgeedge with one S(6)La2Er3 square pyramid,  an edgeedge with one S(3)Er4 tetrahedra, edges with three equivalent S(5)La2Er3 trigonal bipyramids, edges with four equivalent S(4)La3Er2 trigonal bipyramids, and edges with two equivalent S(2)LaEr3 trigonal pyramids. In the fifth S site, S(5) is bonded to one Er(1), two equivalent Er(2), and two equivalent La(1) atoms to form distorted SLa2Er3 trigonal bipyramids that share corners with two equivalent S(6)La2Er3 square pyramids,  a cornercorner with one S(3)Er4 tetrahedra, corners with two equivalent S(4)La3Er2 trigonal bipyramids, corners with three equivalent S(2)LaEr3 trigonal pyramids,  an edgeedge with one S(6)La2Er3 square pyramid, edges with two equivalent S(3)Er4 tetrahedra, edges with two equivalent S(5)La2Er3 trigonal bipyramids, and edges with three equivalent S(4)La3Er2 trigonal bipyramids. In the sixth S site, S(6) is bonded to three equivalent Er(3) and two equivalent La(1) atoms to form SLa2Er3 square pyramids that share corners with two equivalent S(5)La2Er3 trigonal bipyramids, corners with four equivalent S(4)La3Er2 trigonal bipyramids, corners with two equivalent S(2)LaEr3 trigonal pyramids, edges with four equivalent S(6)La2Er3 square pyramids,  an edgeedge with one S(5)La2Er3 trigonal bipyramid,  an edgeedge with one S(4)La3Er2 trigonal bipyramid, and edges with three equivalent S(2)LaEr3 trigonal pyramids. is represented by the CIF file [CIF]
data_La(ErS2)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.980
_cell_length_b   11.035
_cell_length_c   11.285
_cell_angle_alpha   71.148
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   469.063
_cell_formula_units_Z   2
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  0.750  0.551  0.804  1.0
  La  La1  1  0.250  0.449  0.196  1.0
  Er  Er2  1  0.250  0.822  0.001  1.0
  Er  Er3  1  0.750  0.945  0.666  1.0
  Er  Er4  1  0.250  0.055  0.334  1.0
  Er  Er5  1  0.750  0.662  0.412  1.0
  Er  Er6  1  0.250  0.338  0.588  1.0
  Er  Er7  1  0.750  0.178  0.999  1.0
  S  S8  1  0.750  0.893  0.443  1.0
  S  S9  1  0.250  0.107  0.557  1.0
  S  S10  1  0.750  0.301  0.749  1.0
  S  S11  1  0.250  0.699  0.251  1.0
  S  S12  1  0.750  0.978  0.889  1.0
  S  S13  1  0.250  0.022  0.111  1.0
  S  S14  1  0.750  0.622  0.037  1.0
  S  S15  1  0.250  0.378  0.963  1.0
  S  S16  1  0.750  0.229  0.230  1.0
  S  S17  1  0.250  0.771  0.770  1.0
  S  S18  1  0.750  0.418  0.409  1.0
  S  S19  1  0.250  0.582  0.591  1.0
[/CIF]
.
The material structure described by La(ErS2)3 crystallizes in the monoclinic P2_1/m space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded to one S(2), one S(5), two equivalent S(4), and three equivalent S(3) atoms to form distorted ErS7 pentagonal bipyramids that share  a cornercorner with one Er(2)S6 octahedra, corners with two equivalent Er(3)S6 octahedra, edges with two equivalent Er(2)S6 octahedra, and edges with four equivalent Er(1)S7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 39-51°. In the second Er site, Er(2) is bonded to one S(3), two equivalent S(5), and three equivalent S(1) atoms to form ErS6 octahedra that share corners with three equivalent Er(3)S6 octahedra,  a cornercorner with one Er(1)S7 pentagonal bipyramid, edges with four equivalent Er(2)S6 octahedra, and edges with two equivalent Er(1)S7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 53-63°. In the third Er site, Er(3) is bonded to one S(1), two equivalent S(2), and three equivalent S(6) atoms to form ErS6 octahedra that share corners with three equivalent Er(2)S6 octahedra, corners with two equivalent Er(1)S7 pentagonal bipyramids, and edges with four equivalent Er(3)S6 octahedra. The corner-sharing octahedral tilt angles range from 53-63°. La(1) is bonded in a 8-coordinate geometry to one S(2), two equivalent S(5), two equivalent S(6), and three equivalent S(4) atoms. There are six inequivalent S sites. In the first S site, S(1) is bonded in a rectangular see-saw-like geometry to one Er(3) and three equivalent Er(2) atoms. In the second S site, S(2) is bonded to one Er(1), two equivalent Er(3), and one La(1) atom to form distorted SLaEr3 trigonal pyramids that share corners with two equivalent S(6)La2Er3 square pyramids, corners with three equivalent S(3)Er4 tetrahedra,  a cornercorner with one S(4)La3Er2 trigonal bipyramid, corners with three equivalent S(5)La2Er3 trigonal bipyramids, corners with two equivalent S(2)LaEr3 trigonal pyramids, edges with three equivalent S(6)La2Er3 square pyramids, and edges with two equivalent S(4)La3Er2 trigonal bipyramids. In the third S site, S(3) is bonded to one Er(2) and three equivalent Er(1) atoms to form distorted SEr4 tetrahedra that share corners with two equivalent S(3)Er4 tetrahedra,  a cornercorner with one S(5)La2Er3 trigonal bipyramid, corners with four equivalent S(4)La3Er2 trigonal bipyramids, corners with three equivalent S(2)LaEr3 trigonal pyramids, edges with two equivalent S(3)Er4 tetrahedra,  an edgeedge with one S(4)La3Er2 trigonal bipyramid, and edges with two equivalent S(5)La2Er3 trigonal bipyramids. In the fourth S site, S(4) is bonded to two equivalent Er(1) and three equivalent La(1) atoms to form distorted SLa3Er2 trigonal bipyramids that share corners with four equivalent S(6)La2Er3 square pyramids, corners with four equivalent S(3)Er4 tetrahedra, corners with two equivalent S(5)La2Er3 trigonal bipyramids,  a cornercorner with one S(2)LaEr3 trigonal pyramid,  an edgeedge with one S(6)La2Er3 square pyramid,  an edgeedge with one S(3)Er4 tetrahedra, edges with three equivalent S(5)La2Er3 trigonal bipyramids, edges with four equivalent S(4)La3Er2 trigonal bipyramids, and edges with two equivalent S(2)LaEr3 trigonal pyramids. In the fifth S site, S(5) is bonded to one Er(1), two equivalent Er(2), and two equivalent La(1) atoms to form distorted SLa2Er3 trigonal bipyramids that share corners with two equivalent S(6)La2Er3 square pyramids,  a cornercorner with one S(3)Er4 tetrahedra, corners with two equivalent S(4)La3Er2 trigonal bipyramids, corners with three equivalent S(2)LaEr3 trigonal pyramids,  an edgeedge with one S(6)La2Er3 square pyramid, edges with two equivalent S(3)Er4 tetrahedra, edges with two equivalent S(5)La2Er3 trigonal bipyramids, and edges with three equivalent S(4)La3Er2 trigonal bipyramids. In the sixth S site, S(6) is bonded to three equivalent Er(3) and two equivalent La(1) atoms to form SLa2Er3 square pyramids that share corners with two equivalent S(5)La2Er3 trigonal bipyramids, corners with four equivalent S(4)La3Er2 trigonal bipyramids, corners with two equivalent S(2)LaEr3 trigonal pyramids, edges with four equivalent S(6)La2Er3 square pyramids,  an edgeedge with one S(5)La2Er3 trigonal bipyramid,  an edgeedge with one S(4)La3Er2 trigonal bipyramid, and edges with three equivalent S(2)LaEr3 trigonal pyramids. is represented by the CIF file [CIF]
data_La(ErS2)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.980
_cell_length_b   11.035
_cell_length_c   11.285
_cell_angle_alpha   71.148
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   469.063
_cell_formula_units_Z   2
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  0.750  0.551  0.804  1.0
  La  La1  1  0.250  0.449  0.196  1.0
  Er  Er2  1  0.250  0.822  0.001  1.0
  Er  Er3  1  0.750  0.945  0.666  1.0
  Er  Er4  1  0.250  0.055  0.334  1.0
  Er  Er5  1  0.750  0.662  0.412  1.0
  Er  Er6  1  0.250  0.338  0.588  1.0
  Er  Er7  1  0.750  0.178  0.999  1.0
  S  S8  1  0.750  0.893  0.443  1.0
  S  S9  1  0.250  0.107  0.557  1.0
  S  S10  1  0.750  0.301  0.749  1.0
  S  S11  1  0.250  0.699  0.251  1.0
  S  S12  1  0.750  0.978  0.889  1.0
  S  S13  1  0.250  0.022  0.111  1.0
  S  S14  1  0.750  0.622  0.037  1.0
  S  S15  1  0.250  0.378  0.963  1.0
  S  S16  1  0.750  0.229  0.230  1.0
  S  S17  1  0.250  0.771  0.770  1.0
  S  S18  1  0.750  0.418  0.409  1.0
  S  S19  1  0.250  0.582  0.591  1.0
[/CIF]
.