The material structure described by ErO9I crystallizes in the monoclinic P2_1/c space group. Er(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), one O(8), and two equivalent O(1) atoms. There are nine inequivalent O sites. In the first O site, O(7) is bonded in a bent 120 degrees geometry to one O(3) and one I(1) atom. In the second O site, O(8) is bonded in a water-like geometry to one Er(1) and one I(1) atom. In the third O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Er(1) and one I(1) atom. In the fourth O site, O(9) is bonded in a bent 120 degrees geometry to one O(6) and one I(1) atom. In the fifth O site, O(2) is bonded in a water-like geometry to one Er(1) and one I(1) atom. In the sixth O site, O(3) is bonded in a bent 120 degrees geometry to one Er(1) and one O(7) atom. In the seventh O site, O(4) is bonded in a water-like geometry to one Er(1) and one I(1) atom. In the eighth O site, O(5) is bonded in a single-bond geometry to one Er(1) atom. In the ninth O site, O(6) is bonded in a water-like geometry to one Er(1) and one O(9) atom. I(1) is bonded in an octahedral geometry to one O(1), one O(2), one O(4), one O(7), one O(8), and one O(9) atom. is represented by the CIF file [CIF]
data_ErIO9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.100
_cell_length_b   6.492
_cell_length_c   10.600
_cell_angle_alpha   55.457
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   629.217
_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  0.583  0.771  0.193  1.0
  Er  Er1  1  0.417  0.229  0.807  1.0
  Er  Er2  1  0.083  0.229  0.307  1.0
  Er  Er3  1  0.917  0.771  0.693  1.0
  I  I4  1  0.827  0.978  0.263  1.0
  I  I5  1  0.173  0.022  0.737  1.0
  I  I6  1  0.327  0.022  0.237  1.0
  I  I7  1  0.673  0.978  0.763  1.0
  O  O8  1  0.927  0.922  0.431  1.0
  O  O9  1  0.073  0.078  0.569  1.0
  O  O10  1  0.427  0.078  0.069  1.0
  O  O11  1  0.573  0.922  0.931  1.0
  O  O12  1  0.238  0.952  0.407  1.0
  O  O13  1  0.762  0.048  0.593  1.0
  O  O14  1  0.738  0.048  0.093  1.0
  O  O15  1  0.262  0.952  0.907  1.0
  O  O16  1  0.729  0.471  0.195  1.0
  O  O17  1  0.271  0.529  0.805  1.0
  O  O18  1  0.229  0.529  0.305  1.0
  O  O19  1  0.771  0.471  0.695  1.0
  O  O20  1  0.717  0.727  0.384  1.0
  O  O21  1  0.283  0.273  0.616  1.0
  O  O22  1  0.217  0.273  0.116  1.0
  O  O23  1  0.783  0.727  0.884  1.0
  O  O24  1  0.578  0.358  0.413  1.0
  O  O25  1  0.422  0.642  0.587  1.0
  O  O26  1  0.078  0.642  0.087  1.0
  O  O27  1  0.922  0.358  0.913  1.0
  O  O28  1  0.435  0.518  0.151  1.0
  O  O29  1  0.565  0.482  0.849  1.0
  O  O30  1  0.935  0.482  0.349  1.0
  O  O31  1  0.065  0.518  0.651  1.0
  O  O32  1  0.197  0.760  0.237  1.0
  O  O33  1  0.803  0.240  0.763  1.0
  O  O34  1  0.697  0.240  0.263  1.0
  O  O35  1  0.303  0.760  0.737  1.0
  O  O36  1  0.443  0.766  0.353  1.0
  O  O37  1  0.557  0.234  0.647  1.0
  O  O38  1  0.943  0.234  0.147  1.0
  O  O39  1  0.057  0.766  0.853  1.0
  O  O40  1  0.941  0.715  0.235  1.0
  O  O41  1  0.059  0.285  0.765  1.0
  O  O42  1  0.441  0.285  0.265  1.0
  O  O43  1  0.559  0.715  0.735  1.0
[/CIF]
.
The material structure described by ErO9I crystallizes in the monoclinic P2_1/c space group. Er(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), one O(8), and two equivalent O(1) atoms. There are nine inequivalent O sites. In the first O site, O(7) is bonded in a bent 120 degrees geometry to one O(3) and one I(1) atom. In the second O site, O(8) is bonded in a water-like geometry to one Er(1) and one I(1) atom. In the third O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Er(1) and one I(1) atom. In the fourth O site, O(9) is bonded in a bent 120 degrees geometry to one O(6) and one I(1) atom. In the fifth O site, O(2) is bonded in a water-like geometry to one Er(1) and one I(1) atom. In the sixth O site, O(3) is bonded in a bent 120 degrees geometry to one Er(1) and one O(7) atom. In the seventh O site, O(4) is bonded in a water-like geometry to one Er(1) and one I(1) atom. In the eighth O site, O(5) is bonded in a single-bond geometry to one Er(1) atom. In the ninth O site, O(6) is bonded in a water-like geometry to one Er(1) and one O(9) atom. I(1) is bonded in an octahedral geometry to one O(1), one O(2), one O(4), one O(7), one O(8), and one O(9) atom. is represented by the CIF file [CIF]
data_ErIO9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.100
_cell_length_b   6.492
_cell_length_c   10.600
_cell_angle_alpha   55.457
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   629.217
_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  0.583  0.771  0.193  1.0
  Er  Er1  1  0.417  0.229  0.807  1.0
  Er  Er2  1  0.083  0.229  0.307  1.0
  Er  Er3  1  0.917  0.771  0.693  1.0
  I  I4  1  0.827  0.978  0.263  1.0
  I  I5  1  0.173  0.022  0.737  1.0
  I  I6  1  0.327  0.022  0.237  1.0
  I  I7  1  0.673  0.978  0.763  1.0
  O  O8  1  0.927  0.922  0.431  1.0
  O  O9  1  0.073  0.078  0.569  1.0
  O  O10  1  0.427  0.078  0.069  1.0
  O  O11  1  0.573  0.922  0.931  1.0
  O  O12  1  0.238  0.952  0.407  1.0
  O  O13  1  0.762  0.048  0.593  1.0
  O  O14  1  0.738  0.048  0.093  1.0
  O  O15  1  0.262  0.952  0.907  1.0
  O  O16  1  0.729  0.471  0.195  1.0
  O  O17  1  0.271  0.529  0.805  1.0
  O  O18  1  0.229  0.529  0.305  1.0
  O  O19  1  0.771  0.471  0.695  1.0
  O  O20  1  0.717  0.727  0.384  1.0
  O  O21  1  0.283  0.273  0.616  1.0
  O  O22  1  0.217  0.273  0.116  1.0
  O  O23  1  0.783  0.727  0.884  1.0
  O  O24  1  0.578  0.358  0.413  1.0
  O  O25  1  0.422  0.642  0.587  1.0
  O  O26  1  0.078  0.642  0.087  1.0
  O  O27  1  0.922  0.358  0.913  1.0
  O  O28  1  0.435  0.518  0.151  1.0
  O  O29  1  0.565  0.482  0.849  1.0
  O  O30  1  0.935  0.482  0.349  1.0
  O  O31  1  0.065  0.518  0.651  1.0
  O  O32  1  0.197  0.760  0.237  1.0
  O  O33  1  0.803  0.240  0.763  1.0
  O  O34  1  0.697  0.240  0.263  1.0
  O  O35  1  0.303  0.760  0.737  1.0
  O  O36  1  0.443  0.766  0.353  1.0
  O  O37  1  0.557  0.234  0.647  1.0
  O  O38  1  0.943  0.234  0.147  1.0
  O  O39  1  0.057  0.766  0.853  1.0
  O  O40  1  0.941  0.715  0.235  1.0
  O  O41  1  0.059  0.285  0.765  1.0
  O  O42  1  0.441  0.285  0.265  1.0
  O  O43  1  0.559  0.715  0.735  1.0
[/CIF]
.