The structure described by Er2SiSO4 crystallizes in the orthorhombic Cmce space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 8-coordinate geometry to two equivalent S(1), two equivalent O(2), and four equivalent O(1) atoms. In the second Er site, Er(2) is bonded in a 8-coordinate geometry to two equivalent S(1), two equivalent O(1), and four equivalent O(2) atoms. Si(1) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. S(1) is bonded to two equivalent Er(1) and two equivalent Er(2) atoms to form a mixture of distorted corner and edge-sharing SEr4 trigonal pyramids. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Er(2), two equivalent Er(1), and one Si(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Er(1), two equivalent Er(2), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Er2SiSO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.195
_cell_length_b   8.195
_cell_length_c   6.855
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   98.200
_symmetry_Int_Tables_number   1
_cell_volume   455.705
_cell_formula_units_Z   4
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  0.671  0.329  0.023  1.0
  Er  Er1  1  0.810  0.690  0.750  1.0
  Er  Er2  1  0.171  0.829  0.477  1.0
  Er  Er3  1  0.190  0.310  0.250  1.0
  Er  Er4  1  0.690  0.810  0.250  1.0
  Er  Er5  1  0.829  0.171  0.523  1.0
  Er  Er6  1  0.329  0.671  0.977  1.0
  Er  Er7  1  0.310  0.190  0.750  1.0
  Si  Si8  1  0.564  0.936  0.750  1.0
  Si  Si9  1  0.436  0.064  0.250  1.0
  Si  Si10  1  0.064  0.436  0.750  1.0
  Si  Si11  1  0.936  0.564  0.250  1.0
  S  S12  1  0.491  0.509  0.253  1.0
  S  S13  1  0.009  0.991  0.753  1.0
  S  S14  1  0.991  0.009  0.247  1.0
  S  S15  1  0.509  0.491  0.747  1.0
  O  O16  1  0.390  0.863  0.236  1.0
  O  O17  1  0.863  0.390  0.764  1.0
  O  O18  1  0.831  0.619  0.064  1.0
  O  O19  1  0.881  0.669  0.436  1.0
  O  O20  1  0.137  0.610  0.236  1.0
  O  O21  1  0.890  0.363  0.264  1.0
  O  O22  1  0.331  0.119  0.436  1.0
  O  O23  1  0.637  0.110  0.264  1.0
  O  O24  1  0.610  0.137  0.764  1.0
  O  O25  1  0.381  0.169  0.064  1.0
  O  O26  1  0.110  0.637  0.736  1.0
  O  O27  1  0.169  0.381  0.936  1.0
  O  O28  1  0.119  0.331  0.564  1.0
  O  O29  1  0.363  0.890  0.736  1.0
  O  O30  1  0.619  0.831  0.936  1.0
  O  O31  1  0.669  0.881  0.564  1.0
[/CIF]
.
The structure described by Er2SiSO4 crystallizes in the orthorhombic Cmce space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 8-coordinate geometry to two equivalent S(1), two equivalent O(2), and four equivalent O(1) atoms. In the second Er site, Er(2) is bonded in a 8-coordinate geometry to two equivalent S(1), two equivalent O(1), and four equivalent O(2) atoms. Si(1) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. S(1) is bonded to two equivalent Er(1) and two equivalent Er(2) atoms to form a mixture of distorted corner and edge-sharing SEr4 trigonal pyramids. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Er(2), two equivalent Er(1), and one Si(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Er(1), two equivalent Er(2), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Er2SiSO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.195
_cell_length_b   8.195
_cell_length_c   6.855
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   98.200
_symmetry_Int_Tables_number   1
_cell_volume   455.705
_cell_formula_units_Z   4
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  0.671  0.329  0.023  1.0
  Er  Er1  1  0.810  0.690  0.750  1.0
  Er  Er2  1  0.171  0.829  0.477  1.0
  Er  Er3  1  0.190  0.310  0.250  1.0
  Er  Er4  1  0.690  0.810  0.250  1.0
  Er  Er5  1  0.829  0.171  0.523  1.0
  Er  Er6  1  0.329  0.671  0.977  1.0
  Er  Er7  1  0.310  0.190  0.750  1.0
  Si  Si8  1  0.564  0.936  0.750  1.0
  Si  Si9  1  0.436  0.064  0.250  1.0
  Si  Si10  1  0.064  0.436  0.750  1.0
  Si  Si11  1  0.936  0.564  0.250  1.0
  S  S12  1  0.491  0.509  0.253  1.0
  S  S13  1  0.009  0.991  0.753  1.0
  S  S14  1  0.991  0.009  0.247  1.0
  S  S15  1  0.509  0.491  0.747  1.0
  O  O16  1  0.390  0.863  0.236  1.0
  O  O17  1  0.863  0.390  0.764  1.0
  O  O18  1  0.831  0.619  0.064  1.0
  O  O19  1  0.881  0.669  0.436  1.0
  O  O20  1  0.137  0.610  0.236  1.0
  O  O21  1  0.890  0.363  0.264  1.0
  O  O22  1  0.331  0.119  0.436  1.0
  O  O23  1  0.637  0.110  0.264  1.0
  O  O24  1  0.610  0.137  0.764  1.0
  O  O25  1  0.381  0.169  0.064  1.0
  O  O26  1  0.110  0.637  0.736  1.0
  O  O27  1  0.169  0.381  0.936  1.0
  O  O28  1  0.119  0.331  0.564  1.0
  O  O29  1  0.363  0.890  0.736  1.0
  O  O30  1  0.619  0.831  0.936  1.0
  O  O31  1  0.669  0.881  0.564  1.0
[/CIF]
.