The compound described by ErAgS2 crystallizes in the monoclinic P2_1 space group. There are four inequivalent Er sites. In the first Er site, Er(1) is bonded to one S(3), one S(4), two equivalent S(7), and two equivalent S(8) atoms to form ErS6 octahedra that share corners with four equivalent Er(1)S6 octahedra, corners with two equivalent Ag(2)S5 trigonal bipyramids, edges with two equivalent Er(2)S6 octahedra, edges with two equivalent Er(3)S6 octahedra, and edges with two equivalent Ag(1)S5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 15-18°. In the second Er site, Er(2) is bonded to one S(1), one S(3), one S(4), one S(5), one S(6), and one S(7) atom to form ErS6 octahedra that share corners with four equivalent Er(3)S6 octahedra,  a cornercorner with one Ag(2)S5 trigonal bipyramid, edges with two equivalent Er(1)S6 octahedra, edges with two equivalent Er(4)S6 octahedra, edges with two equivalent Ag(1)S5 trigonal bipyramids, and edges with two equivalent Ag(2)S5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 14-19°. In the third Er site, Er(3) is bonded to one S(2), one S(3), one S(4), one S(5), one S(6), and one S(8) atom to form ErS6 octahedra that share corners with four equivalent Er(2)S6 octahedra,  a cornercorner with one Ag(1)S5 trigonal bipyramid, edges with two equivalent Er(1)S6 octahedra, edges with two equivalent Er(4)S6 octahedra, edges with two equivalent Ag(1)S5 trigonal bipyramids, and edges with two equivalent Ag(2)S5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 14-19°. In the fourth Er site, Er(4) is bonded to one S(5), one S(6), two equivalent S(1), and two equivalent S(2) atoms to form ErS6 octahedra that share corners with four equivalent Er(4)S6 octahedra, corners with two equivalent Ag(1)S5 trigonal bipyramids, edges with two equivalent Er(2)S6 octahedra, edges with two equivalent Er(3)S6 octahedra, and edges with two equivalent Ag(2)S5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 12-18°. There are four inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to one S(3), one S(4), one S(5), one S(6), and one S(8) atom to form distorted AgS5 trigonal bipyramids that share  a cornercorner with one Er(3)S6 octahedra, corners with two equivalent Er(4)S6 octahedra, corners with four equivalent Ag(2)S5 trigonal bipyramids, edges with two equivalent Er(1)S6 octahedra, edges with two equivalent Er(2)S6 octahedra, and edges with two equivalent Er(3)S6 octahedra. The corner-sharing octahedral tilt angles range from 8-82°. In the second Ag site, Ag(2) is bonded to one S(1), one S(3), one S(4), one S(5), and one S(6) atom to form distorted AgS5 trigonal bipyramids that share  a cornercorner with one Er(2)S6 octahedra, corners with two equivalent Er(1)S6 octahedra, corners with four equivalent Ag(1)S5 trigonal bipyramids, edges with two equivalent Er(2)S6 octahedra, edges with two equivalent Er(3)S6 octahedra, and edges with two equivalent Er(4)S6 octahedra. The corner-sharing octahedral tilt angles range from 8-79°. In the third Ag site, Ag(3) is bonded in a 5-coordinate geometry to one S(6), two equivalent S(7), and two equivalent S(8) atoms. In the fourth Ag site, Ag(4) is bonded in a 4-coordinate geometry to one S(4), two equivalent S(1), and two equivalent S(2) atoms. There are eight inequivalent S sites. In the first S site, S(1) is bonded to one Er(2), two equivalent Er(4), one Ag(2), and two equivalent Ag(4) atoms to form distorted SEr3Ag3 octahedra that share  a cornercorner with one S(7)Er3Ag2 square pyramid, corners with two equivalent S(3)Er3Ag2 square pyramids, corners with four equivalent S(2)Er3Ag2 square pyramids, edges with two equivalent S(1)Er3Ag3 octahedra, edges with two equivalent S(2)Er3Ag2 square pyramids, and edges with two equivalent S(5)Er3Ag2 square pyramids. In the second S site, S(2) is bonded to one Er(3), two equivalent Er(4), and two equivalent Ag(4) atoms to form SEr3Ag2 square pyramids that share  a cornercorner with one S(8)Er3Ag3 octahedra, corners with four equivalent S(1)Er3Ag3 octahedra,  a cornercorner with one S(3)Er3Ag2 square pyramid,  a cornercorner with one S(5)Er3Ag2 square pyramid, edges with two equivalent S(1)Er3Ag3 octahedra,  an edgeedge with one S(5)Er3Ag2 square pyramid, and edges with two equivalent S(2)Er3Ag2 square pyramids. The corner-sharing octahedral tilt angles range from 4-20°. In the third S site, S(3) is bonded to one Er(1), one Er(2), one Er(3), one Ag(1), and one Ag(2) atom to form distorted SEr3Ag2 square pyramids that share corners with two equivalent S(1)Er3Ag3 octahedra,  a cornercorner with one S(2)Er3Ag2 square pyramid,  a cornercorner with one S(7)Er3Ag2 square pyramid, edges with two equivalent S(8)Er3Ag3 octahedra,  an edgeedge with one S(7)Er3Ag2 square pyramid, and edges with two equivalent S(5)Er3Ag2 square pyramids. The corner-sharing octahedral tilt angles range from 78-82°. In the fourth S site, S(4) is bonded in a 6-coordinate geometry to one Er(1), one Er(2), one Er(3), one Ag(1), one Ag(2), and one Ag(4) atom. In the fifth S site, S(5) is bonded to one Er(2), one Er(3), one Er(4), one Ag(1), and one Ag(2) atom to form SEr3Ag2 square pyramids that share corners with two equivalent S(8)Er3Ag3 octahedra,  a cornercorner with one S(2)Er3Ag2 square pyramid,  a cornercorner with one S(7)Er3Ag2 square pyramid, edges with two equivalent S(1)Er3Ag3 octahedra,  an edgeedge with one S(2)Er3Ag2 square pyramid, and edges with two equivalent S(3)Er3Ag2 square pyramids. The corner-sharing octahedral tilt angles are 82°. In the sixth S site, S(6) is bonded in a 6-coordinate geometry to one Er(2), one Er(3), one Er(4), one Ag(1), one Ag(2), and one Ag(3) atom. In the seventh S site, S(7) is bonded to one Er(2), two equivalent Er(1), and two equivalent Ag(3) atoms to form SEr3Ag2 square pyramids that share  a cornercorner with one S(1)Er3Ag3 octahedra, corners with four equivalent S(8)Er3Ag3 octahedra,  a cornercorner with one S(3)Er3Ag2 square pyramid,  a cornercorner with one S(5)Er3Ag2 square pyramid, edges with two equivalent S(8)Er3Ag3 octahedra,  an edgeedge with one S(3)Er3Ag2 square pyramid, and edges with two equivalent S(7)Er3Ag2 square pyramids. The corner-sharing octahedral tilt angles range from 4-21°. In the eighth S site, S(8) is bonded to one Er(3), two equivalent Er(1), one Ag(1), and two equivalent Ag(3) atoms to form distorted SEr3Ag3 octahedra that share  a cornercorner with one S(2)Er3Ag2 square pyramid, corners with two equivalent S(5)Er3Ag2 square pyramids, corners with four equivalent S(7)Er3Ag2 square pyramids, edges with two equivalent S(8)Er3Ag3 octahedra, edges with two equivalent S(3)Er3Ag2 square pyramids, and edges with two equivalent S(7)Er3Ag2 square pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_ErAgS2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.662
_cell_length_b   7.661
_cell_length_c   12.200
_cell_angle_alpha   89.908
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   716.097
_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
  Er  Er0  1  0.502  0.747  0.002  1.0
  Er  Er1  1  0.002  0.253  0.998  1.0
  Er  Er2  1  0.254  0.001  0.755  1.0
  Er  Er3  1  0.754  0.999  0.245  1.0
  Er  Er4  1  0.748  0.498  0.746  1.0
  Er  Er5  1  0.248  0.502  0.254  1.0
  Er  Er6  1  0.002  0.753  0.503  1.0
  Er  Er7  1  0.502  0.247  0.497  1.0
  Ag  Ag8  1  0.250  0.503  0.780  1.0
  Ag  Ag9  1  0.750  0.497  0.220  1.0
  Ag  Ag10  1  0.754  0.997  0.704  1.0
  Ag  Ag11  1  0.254  0.003  0.296  1.0
  Ag  Ag12  1  0.004  0.752  0.019  1.0
  Ag  Ag13  1  0.504  0.248  0.981  1.0
  Ag  Ag14  1  0.501  0.745  0.515  1.0
  Ag  Ag15  1  0.001  0.255  0.485  1.0
  S  S16  1  0.770  0.018  0.469  1.0
  S  S17  1  0.270  0.983  0.531  1.0
  S  S18  1  0.240  0.487  0.479  1.0
  S  S19  1  0.740  0.513  0.521  1.0
  S  S20  1  0.523  0.729  0.228  1.0
  S  S21  1  0.023  0.271  0.772  1.0
  S  S22  1  0.482  0.729  0.778  1.0
  S  S23  1  0.982  0.271  0.222  1.0
  S  S24  1  0.982  0.769  0.730  1.0
  S  S25  1  0.482  0.231  0.270  1.0
  S  S26  1  0.526  0.226  0.720  1.0
  S  S27  1  0.026  0.774  0.280  1.0
  S  S28  1  0.274  0.021  0.979  1.0
  S  S29  1  0.774  0.979  0.021  1.0
  S  S30  1  0.731  0.478  0.970  1.0
  S  S31  1  0.231  0.522  0.030  1.0
[/CIF]
.
The compound described by ErAgS2 crystallizes in the monoclinic P2_1 space group. There are four inequivalent Er sites. In the first Er site, Er(1) is bonded to one S(3), one S(4), two equivalent S(7), and two equivalent S(8) atoms to form ErS6 octahedra that share corners with four equivalent Er(1)S6 octahedra, corners with two equivalent Ag(2)S5 trigonal bipyramids, edges with two equivalent Er(2)S6 octahedra, edges with two equivalent Er(3)S6 octahedra, and edges with two equivalent Ag(1)S5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 15-18°. In the second Er site, Er(2) is bonded to one S(1), one S(3), one S(4), one S(5), one S(6), and one S(7) atom to form ErS6 octahedra that share corners with four equivalent Er(3)S6 octahedra,  a cornercorner with one Ag(2)S5 trigonal bipyramid, edges with two equivalent Er(1)S6 octahedra, edges with two equivalent Er(4)S6 octahedra, edges with two equivalent Ag(1)S5 trigonal bipyramids, and edges with two equivalent Ag(2)S5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 14-19°. In the third Er site, Er(3) is bonded to one S(2), one S(3), one S(4), one S(5), one S(6), and one S(8) atom to form ErS6 octahedra that share corners with four equivalent Er(2)S6 octahedra,  a cornercorner with one Ag(1)S5 trigonal bipyramid, edges with two equivalent Er(1)S6 octahedra, edges with two equivalent Er(4)S6 octahedra, edges with two equivalent Ag(1)S5 trigonal bipyramids, and edges with two equivalent Ag(2)S5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 14-19°. In the fourth Er site, Er(4) is bonded to one S(5), one S(6), two equivalent S(1), and two equivalent S(2) atoms to form ErS6 octahedra that share corners with four equivalent Er(4)S6 octahedra, corners with two equivalent Ag(1)S5 trigonal bipyramids, edges with two equivalent Er(2)S6 octahedra, edges with two equivalent Er(3)S6 octahedra, and edges with two equivalent Ag(2)S5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 12-18°. There are four inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to one S(3), one S(4), one S(5), one S(6), and one S(8) atom to form distorted AgS5 trigonal bipyramids that share  a cornercorner with one Er(3)S6 octahedra, corners with two equivalent Er(4)S6 octahedra, corners with four equivalent Ag(2)S5 trigonal bipyramids, edges with two equivalent Er(1)S6 octahedra, edges with two equivalent Er(2)S6 octahedra, and edges with two equivalent Er(3)S6 octahedra. The corner-sharing octahedral tilt angles range from 8-82°. In the second Ag site, Ag(2) is bonded to one S(1), one S(3), one S(4), one S(5), and one S(6) atom to form distorted AgS5 trigonal bipyramids that share  a cornercorner with one Er(2)S6 octahedra, corners with two equivalent Er(1)S6 octahedra, corners with four equivalent Ag(1)S5 trigonal bipyramids, edges with two equivalent Er(2)S6 octahedra, edges with two equivalent Er(3)S6 octahedra, and edges with two equivalent Er(4)S6 octahedra. The corner-sharing octahedral tilt angles range from 8-79°. In the third Ag site, Ag(3) is bonded in a 5-coordinate geometry to one S(6), two equivalent S(7), and two equivalent S(8) atoms. In the fourth Ag site, Ag(4) is bonded in a 4-coordinate geometry to one S(4), two equivalent S(1), and two equivalent S(2) atoms. There are eight inequivalent S sites. In the first S site, S(1) is bonded to one Er(2), two equivalent Er(4), one Ag(2), and two equivalent Ag(4) atoms to form distorted SEr3Ag3 octahedra that share  a cornercorner with one S(7)Er3Ag2 square pyramid, corners with two equivalent S(3)Er3Ag2 square pyramids, corners with four equivalent S(2)Er3Ag2 square pyramids, edges with two equivalent S(1)Er3Ag3 octahedra, edges with two equivalent S(2)Er3Ag2 square pyramids, and edges with two equivalent S(5)Er3Ag2 square pyramids. In the second S site, S(2) is bonded to one Er(3), two equivalent Er(4), and two equivalent Ag(4) atoms to form SEr3Ag2 square pyramids that share  a cornercorner with one S(8)Er3Ag3 octahedra, corners with four equivalent S(1)Er3Ag3 octahedra,  a cornercorner with one S(3)Er3Ag2 square pyramid,  a cornercorner with one S(5)Er3Ag2 square pyramid, edges with two equivalent S(1)Er3Ag3 octahedra,  an edgeedge with one S(5)Er3Ag2 square pyramid, and edges with two equivalent S(2)Er3Ag2 square pyramids. The corner-sharing octahedral tilt angles range from 4-20°. In the third S site, S(3) is bonded to one Er(1), one Er(2), one Er(3), one Ag(1), and one Ag(2) atom to form distorted SEr3Ag2 square pyramids that share corners with two equivalent S(1)Er3Ag3 octahedra,  a cornercorner with one S(2)Er3Ag2 square pyramid,  a cornercorner with one S(7)Er3Ag2 square pyramid, edges with two equivalent S(8)Er3Ag3 octahedra,  an edgeedge with one S(7)Er3Ag2 square pyramid, and edges with two equivalent S(5)Er3Ag2 square pyramids. The corner-sharing octahedral tilt angles range from 78-82°. In the fourth S site, S(4) is bonded in a 6-coordinate geometry to one Er(1), one Er(2), one Er(3), one Ag(1), one Ag(2), and one Ag(4) atom. In the fifth S site, S(5) is bonded to one Er(2), one Er(3), one Er(4), one Ag(1), and one Ag(2) atom to form SEr3Ag2 square pyramids that share corners with two equivalent S(8)Er3Ag3 octahedra,  a cornercorner with one S(2)Er3Ag2 square pyramid,  a cornercorner with one S(7)Er3Ag2 square pyramid, edges with two equivalent S(1)Er3Ag3 octahedra,  an edgeedge with one S(2)Er3Ag2 square pyramid, and edges with two equivalent S(3)Er3Ag2 square pyramids. The corner-sharing octahedral tilt angles are 82°. In the sixth S site, S(6) is bonded in a 6-coordinate geometry to one Er(2), one Er(3), one Er(4), one Ag(1), one Ag(2), and one Ag(3) atom. In the seventh S site, S(7) is bonded to one Er(2), two equivalent Er(1), and two equivalent Ag(3) atoms to form SEr3Ag2 square pyramids that share  a cornercorner with one S(1)Er3Ag3 octahedra, corners with four equivalent S(8)Er3Ag3 octahedra,  a cornercorner with one S(3)Er3Ag2 square pyramid,  a cornercorner with one S(5)Er3Ag2 square pyramid, edges with two equivalent S(8)Er3Ag3 octahedra,  an edgeedge with one S(3)Er3Ag2 square pyramid, and edges with two equivalent S(7)Er3Ag2 square pyramids. The corner-sharing octahedral tilt angles range from 4-21°. In the eighth S site, S(8) is bonded to one Er(3), two equivalent Er(1), one Ag(1), and two equivalent Ag(3) atoms to form distorted SEr3Ag3 octahedra that share  a cornercorner with one S(2)Er3Ag2 square pyramid, corners with two equivalent S(5)Er3Ag2 square pyramids, corners with four equivalent S(7)Er3Ag2 square pyramids, edges with two equivalent S(8)Er3Ag3 octahedra, edges with two equivalent S(3)Er3Ag2 square pyramids, and edges with two equivalent S(7)Er3Ag2 square pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_ErAgS2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.662
_cell_length_b   7.661
_cell_length_c   12.200
_cell_angle_alpha   89.908
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   716.097
_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
  Er  Er0  1  0.502  0.747  0.002  1.0
  Er  Er1  1  0.002  0.253  0.998  1.0
  Er  Er2  1  0.254  0.001  0.755  1.0
  Er  Er3  1  0.754  0.999  0.245  1.0
  Er  Er4  1  0.748  0.498  0.746  1.0
  Er  Er5  1  0.248  0.502  0.254  1.0
  Er  Er6  1  0.002  0.753  0.503  1.0
  Er  Er7  1  0.502  0.247  0.497  1.0
  Ag  Ag8  1  0.250  0.503  0.780  1.0
  Ag  Ag9  1  0.750  0.497  0.220  1.0
  Ag  Ag10  1  0.754  0.997  0.704  1.0
  Ag  Ag11  1  0.254  0.003  0.296  1.0
  Ag  Ag12  1  0.004  0.752  0.019  1.0
  Ag  Ag13  1  0.504  0.248  0.981  1.0
  Ag  Ag14  1  0.501  0.745  0.515  1.0
  Ag  Ag15  1  0.001  0.255  0.485  1.0
  S  S16  1  0.770  0.018  0.469  1.0
  S  S17  1  0.270  0.983  0.531  1.0
  S  S18  1  0.240  0.487  0.479  1.0
  S  S19  1  0.740  0.513  0.521  1.0
  S  S20  1  0.523  0.729  0.228  1.0
  S  S21  1  0.023  0.271  0.772  1.0
  S  S22  1  0.482  0.729  0.778  1.0
  S  S23  1  0.982  0.271  0.222  1.0
  S  S24  1  0.982  0.769  0.730  1.0
  S  S25  1  0.482  0.231  0.270  1.0
  S  S26  1  0.526  0.226  0.720  1.0
  S  S27  1  0.026  0.774  0.280  1.0
  S  S28  1  0.274  0.021  0.979  1.0
  S  S29  1  0.774  0.979  0.021  1.0
  S  S30  1  0.731  0.478  0.970  1.0
  S  S31  1  0.231  0.522  0.030  1.0
[/CIF]
.