The compound described by Er2Te4O11 crystallizes in the monoclinic C2/c space group. Er(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a 3-coordinate geometry to one O(2), one O(3), one O(4), and one O(6) atom. In the second Te site, Te(2) is bonded in a see-saw-like geometry to one O(1), one O(2), one O(5), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(5) is bonded in a bent 150 degrees geometry to two equivalent Te(2) atoms. In the second O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Er(1), one Te(1), and one Te(2) atom. In the third O site, O(1) is bonded in a bent 120 degrees geometry to one Er(1) and one Te(2) atom. In the fourth O site, O(2) is bonded in a 3-coordinate geometry to one Er(1), one Te(1), and one Te(2) atom. In the fifth O site, O(3) is bonded in a trigonal planar geometry to two equivalent Er(1) and one Te(1) atom. In the sixth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Er(1) and one Te(1) atom. is represented by the CIF card [CIF]
data_Er2Te4O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.651
_cell_length_b   6.651
_cell_length_c   16.011
_cell_angle_alpha   75.442
_cell_angle_beta   75.442
_cell_angle_gamma   44.908
_symmetry_Int_Tables_number   1
_cell_volume   481.111
_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
  Er  Er0  1  0.630  0.132  0.036  1.0
  Er  Er1  1  0.370  0.868  0.964  1.0
  Er  Er2  1  0.132  0.630  0.536  1.0
  Er  Er3  1  0.868  0.370  0.464  1.0
  Te  Te4  1  0.845  0.409  0.126  1.0
  Te  Te5  1  0.159  0.597  0.198  1.0
  Te  Te6  1  0.591  0.155  0.374  1.0
  Te  Te7  1  0.841  0.403  0.802  1.0
  Te  Te8  1  0.597  0.159  0.698  1.0
  Te  Te9  1  0.155  0.591  0.874  1.0
  Te  Te10  1  0.409  0.845  0.626  1.0
  Te  Te11  1  0.403  0.841  0.302  1.0
  O  O12  1  0.910  0.795  0.666  1.0
  O  O13  1  0.810  0.684  0.874  1.0
  O  O14  1  0.190  0.316  0.126  1.0
  O  O15  1  0.246  0.339  0.447  1.0
  O  O16  1  0.205  0.090  0.834  1.0
  O  O17  1  0.316  0.190  0.626  1.0
  O  O18  1  0.090  0.205  0.334  1.0
  O  O19  1  0.037  0.823  0.956  1.0
  O  O20  1  0.823  0.037  0.456  1.0
  O  O21  1  0.339  0.246  0.947  1.0
  O  O22  1  0.661  0.754  0.053  1.0
  O  O23  1  0.850  0.150  0.750  1.0
  O  O24  1  0.398  0.555  0.095  1.0
  O  O25  1  0.684  0.810  0.374  1.0
  O  O26  1  0.602  0.445  0.905  1.0
  O  O27  1  0.555  0.398  0.595  1.0
  O  O28  1  0.150  0.850  0.250  1.0
  O  O29  1  0.445  0.602  0.405  1.0
  O  O30  1  0.754  0.661  0.553  1.0
  O  O31  1  0.177  0.963  0.544  1.0
  O  O32  1  0.963  0.177  0.044  1.0
  O  O33  1  0.795  0.910  0.166  1.0
[/CIF]
.
The compound described by Er2Te4O11 crystallizes in the monoclinic C2/c space group. Er(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a 3-coordinate geometry to one O(2), one O(3), one O(4), and one O(6) atom. In the second Te site, Te(2) is bonded in a see-saw-like geometry to one O(1), one O(2), one O(5), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(5) is bonded in a bent 150 degrees geometry to two equivalent Te(2) atoms. In the second O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Er(1), one Te(1), and one Te(2) atom. In the third O site, O(1) is bonded in a bent 120 degrees geometry to one Er(1) and one Te(2) atom. In the fourth O site, O(2) is bonded in a 3-coordinate geometry to one Er(1), one Te(1), and one Te(2) atom. In the fifth O site, O(3) is bonded in a trigonal planar geometry to two equivalent Er(1) and one Te(1) atom. In the sixth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Er(1) and one Te(1) atom. is represented by the CIF card [CIF]
data_Er2Te4O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.651
_cell_length_b   6.651
_cell_length_c   16.011
_cell_angle_alpha   75.442
_cell_angle_beta   75.442
_cell_angle_gamma   44.908
_symmetry_Int_Tables_number   1
_cell_volume   481.111
_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
  Er  Er0  1  0.630  0.132  0.036  1.0
  Er  Er1  1  0.370  0.868  0.964  1.0
  Er  Er2  1  0.132  0.630  0.536  1.0
  Er  Er3  1  0.868  0.370  0.464  1.0
  Te  Te4  1  0.845  0.409  0.126  1.0
  Te  Te5  1  0.159  0.597  0.198  1.0
  Te  Te6  1  0.591  0.155  0.374  1.0
  Te  Te7  1  0.841  0.403  0.802  1.0
  Te  Te8  1  0.597  0.159  0.698  1.0
  Te  Te9  1  0.155  0.591  0.874  1.0
  Te  Te10  1  0.409  0.845  0.626  1.0
  Te  Te11  1  0.403  0.841  0.302  1.0
  O  O12  1  0.910  0.795  0.666  1.0
  O  O13  1  0.810  0.684  0.874  1.0
  O  O14  1  0.190  0.316  0.126  1.0
  O  O15  1  0.246  0.339  0.447  1.0
  O  O16  1  0.205  0.090  0.834  1.0
  O  O17  1  0.316  0.190  0.626  1.0
  O  O18  1  0.090  0.205  0.334  1.0
  O  O19  1  0.037  0.823  0.956  1.0
  O  O20  1  0.823  0.037  0.456  1.0
  O  O21  1  0.339  0.246  0.947  1.0
  O  O22  1  0.661  0.754  0.053  1.0
  O  O23  1  0.850  0.150  0.750  1.0
  O  O24  1  0.398  0.555  0.095  1.0
  O  O25  1  0.684  0.810  0.374  1.0
  O  O26  1  0.602  0.445  0.905  1.0
  O  O27  1  0.555  0.398  0.595  1.0
  O  O28  1  0.150  0.850  0.250  1.0
  O  O29  1  0.445  0.602  0.405  1.0
  O  O30  1  0.754  0.661  0.553  1.0
  O  O31  1  0.177  0.963  0.544  1.0
  O  O32  1  0.963  0.177  0.044  1.0
  O  O33  1  0.795  0.910  0.166  1.0
[/CIF]
.