The compound described by ErW2BiO9 crystallizes in the orthorhombic Pmmn space group. Er(1) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(5), and four equivalent O(6) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), two equivalent O(4), and two equivalent O(6) atoms to form corner-sharing WO5 trigonal bipyramids. In the second W site, W(2) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles are 13°. Bi(1) is bonded in a 6-coordinate geometry to six equivalent O(2) atoms. There are six inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Er(1) and one W(1) atom. In the second O site, O(2) is bonded to one W(2) and three equivalent Bi(1) atoms to form a mixture of corner and edge-sharing OBi3W tetrahedra. In the third O site, O(3) is bonded in a linear geometry to two equivalent W(2) atoms. In the fourth O site, O(4) is bonded in a linear geometry to two equivalent W(1) atoms. In the fifth O site, O(5) is bonded in a linear geometry to one Er(1) and one W(2) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to two equivalent Er(1) and one W(1) atom. is represented by the CIF file [CIF]
data_ErBiW2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.916
_cell_length_b   5.749
_cell_length_c   16.356
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   368.253
_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  0.750  0.750  0.666  1.0
  Er  Er1  1  0.250  0.250  0.334  1.0
  Bi  Bi2  1  0.750  0.250  0.053  1.0
  Bi  Bi3  1  0.250  0.750  0.947  1.0
  W  W4  1  0.750  0.750  0.413  1.0
  W  W5  1  0.250  0.250  0.587  1.0
  W  W6  1  0.750  0.250  0.840  1.0
  W  W7  1  0.250  0.750  0.160  1.0
  O  O8  1  0.750  0.750  0.524  1.0
  O  O9  1  0.250  0.250  0.476  1.0
  O  O10  1  0.750  0.480  0.941  1.0
  O  O11  1  0.750  0.020  0.941  1.0
  O  O12  1  0.250  0.980  0.059  1.0
  O  O13  1  0.250  0.520  0.059  1.0
  O  O14  1  0.750  0.750  0.147  1.0
  O  O15  1  0.250  0.250  0.853  1.0
  O  O16  1  0.250  0.750  0.405  1.0
  O  O17  1  0.750  0.250  0.595  1.0
  O  O18  1  0.250  0.500  0.229  1.0
  O  O19  1  0.250  1.000  0.229  1.0
  O  O20  1  0.750  0.000  0.771  1.0
  O  O21  1  0.750  0.500  0.771  1.0
  O  O22  1  0.250  0.531  0.643  1.0
  O  O23  1  0.250  0.969  0.643  1.0
  O  O24  1  0.750  0.031  0.357  1.0
  O  O25  1  0.750  0.469  0.357  1.0
[/CIF]
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The compound described by ErW2BiO9 crystallizes in the orthorhombic Pmmn space group. Er(1) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(5), and four equivalent O(6) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), two equivalent O(4), and two equivalent O(6) atoms to form corner-sharing WO5 trigonal bipyramids. In the second W site, W(2) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles are 13°. Bi(1) is bonded in a 6-coordinate geometry to six equivalent O(2) atoms. There are six inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Er(1) and one W(1) atom. In the second O site, O(2) is bonded to one W(2) and three equivalent Bi(1) atoms to form a mixture of corner and edge-sharing OBi3W tetrahedra. In the third O site, O(3) is bonded in a linear geometry to two equivalent W(2) atoms. In the fourth O site, O(4) is bonded in a linear geometry to two equivalent W(1) atoms. In the fifth O site, O(5) is bonded in a linear geometry to one Er(1) and one W(2) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to two equivalent Er(1) and one W(1) atom. is represented by the CIF file [CIF]
data_ErBiW2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.916
_cell_length_b   5.749
_cell_length_c   16.356
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   368.253
_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  0.750  0.750  0.666  1.0
  Er  Er1  1  0.250  0.250  0.334  1.0
  Bi  Bi2  1  0.750  0.250  0.053  1.0
  Bi  Bi3  1  0.250  0.750  0.947  1.0
  W  W4  1  0.750  0.750  0.413  1.0
  W  W5  1  0.250  0.250  0.587  1.0
  W  W6  1  0.750  0.250  0.840  1.0
  W  W7  1  0.250  0.750  0.160  1.0
  O  O8  1  0.750  0.750  0.524  1.0
  O  O9  1  0.250  0.250  0.476  1.0
  O  O10  1  0.750  0.480  0.941  1.0
  O  O11  1  0.750  0.020  0.941  1.0
  O  O12  1  0.250  0.980  0.059  1.0
  O  O13  1  0.250  0.520  0.059  1.0
  O  O14  1  0.750  0.750  0.147  1.0
  O  O15  1  0.250  0.250  0.853  1.0
  O  O16  1  0.250  0.750  0.405  1.0
  O  O17  1  0.750  0.250  0.595  1.0
  O  O18  1  0.250  0.500  0.229  1.0
  O  O19  1  0.250  1.000  0.229  1.0
  O  O20  1  0.750  0.000  0.771  1.0
  O  O21  1  0.750  0.500  0.771  1.0
  O  O22  1  0.250  0.531  0.643  1.0
  O  O23  1  0.250  0.969  0.643  1.0
  O  O24  1  0.750  0.031  0.357  1.0
  O  O25  1  0.750  0.469  0.357  1.0
[/CIF]
.