The structure described by Cs3YO3 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Cs sites. In the first Cs site, Cs(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form distorted CsO4 tetrahedra that share corners with five equivalent Y(1)O4 tetrahedra and  an edgeedge with one Cs(1)O4 tetrahedra. In the second Cs site, Cs(2) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. In the third Cs site, Cs(3) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. Y(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form YO4 tetrahedra that share corners with five equivalent Cs(1)O4 tetrahedra and  an edgeedge with one Y(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to two equivalent Cs(1), two equivalent Cs(2), two equivalent Cs(3), and one Y(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Cs(1), one Cs(3), two equivalent Cs(2), and two equivalent Y(1) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Cs(1), one Cs(2), two equivalent Cs(3), and one Y(1) atom. is represented by the CIF file [CIF]
data_Cs3YO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.560
_cell_length_b   8.208
_cell_length_c   12.166
_cell_angle_alpha   84.978
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   752.011
_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
  Cs  Cs0  1  0.340  0.351  0.077  1.0
  Cs  Cs1  1  0.624  0.939  0.158  1.0
  Cs  Cs2  1  0.818  0.380  0.190  1.0
  Cs  Cs3  1  0.318  0.620  0.310  1.0
  Cs  Cs4  1  0.124  0.061  0.342  1.0
  Cs  Cs5  1  0.840  0.649  0.423  1.0
  Cs  Cs6  1  0.160  0.351  0.577  1.0
  Cs  Cs7  1  0.876  0.939  0.658  1.0
  Cs  Cs8  1  0.682  0.380  0.690  1.0
  Cs  Cs9  1  0.182  0.620  0.810  1.0
  Cs  Cs10  1  0.376  0.061  0.842  1.0
  Cs  Cs11  1  0.660  0.649  0.923  1.0
  Y  Y12  1  0.089  0.843  0.069  1.0
  Y  Y13  1  0.589  0.157  0.431  1.0
  Y  Y14  1  0.411  0.843  0.569  1.0
  Y  Y15  1  0.911  0.157  0.931  1.0
  O  O16  1  0.349  0.752  0.050  1.0
  O  O17  1  0.052  0.106  0.088  1.0
  O  O18  1  0.949  0.703  0.194  1.0
  O  O19  1  0.449  0.297  0.306  1.0
  O  O20  1  0.552  0.894  0.412  1.0
  O  O21  1  0.849  0.248  0.450  1.0
  O  O22  1  0.151  0.752  0.550  1.0
  O  O23  1  0.448  0.106  0.588  1.0
  O  O24  1  0.551  0.703  0.694  1.0
  O  O25  1  0.051  0.297  0.806  1.0
  O  O26  1  0.948  0.894  0.912  1.0
  O  O27  1  0.651  0.248  0.950  1.0
[/CIF]
.
The structure described by Cs3YO3 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Cs sites. In the first Cs site, Cs(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form distorted CsO4 tetrahedra that share corners with five equivalent Y(1)O4 tetrahedra and  an edgeedge with one Cs(1)O4 tetrahedra. In the second Cs site, Cs(2) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. In the third Cs site, Cs(3) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. Y(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form YO4 tetrahedra that share corners with five equivalent Cs(1)O4 tetrahedra and  an edgeedge with one Y(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to two equivalent Cs(1), two equivalent Cs(2), two equivalent Cs(3), and one Y(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Cs(1), one Cs(3), two equivalent Cs(2), and two equivalent Y(1) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Cs(1), one Cs(2), two equivalent Cs(3), and one Y(1) atom. is represented by the CIF file [CIF]
data_Cs3YO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.560
_cell_length_b   8.208
_cell_length_c   12.166
_cell_angle_alpha   84.978
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   752.011
_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
  Cs  Cs0  1  0.340  0.351  0.077  1.0
  Cs  Cs1  1  0.624  0.939  0.158  1.0
  Cs  Cs2  1  0.818  0.380  0.190  1.0
  Cs  Cs3  1  0.318  0.620  0.310  1.0
  Cs  Cs4  1  0.124  0.061  0.342  1.0
  Cs  Cs5  1  0.840  0.649  0.423  1.0
  Cs  Cs6  1  0.160  0.351  0.577  1.0
  Cs  Cs7  1  0.876  0.939  0.658  1.0
  Cs  Cs8  1  0.682  0.380  0.690  1.0
  Cs  Cs9  1  0.182  0.620  0.810  1.0
  Cs  Cs10  1  0.376  0.061  0.842  1.0
  Cs  Cs11  1  0.660  0.649  0.923  1.0
  Y  Y12  1  0.089  0.843  0.069  1.0
  Y  Y13  1  0.589  0.157  0.431  1.0
  Y  Y14  1  0.411  0.843  0.569  1.0
  Y  Y15  1  0.911  0.157  0.931  1.0
  O  O16  1  0.349  0.752  0.050  1.0
  O  O17  1  0.052  0.106  0.088  1.0
  O  O18  1  0.949  0.703  0.194  1.0
  O  O19  1  0.449  0.297  0.306  1.0
  O  O20  1  0.552  0.894  0.412  1.0
  O  O21  1  0.849  0.248  0.450  1.0
  O  O22  1  0.151  0.752  0.550  1.0
  O  O23  1  0.448  0.106  0.588  1.0
  O  O24  1  0.551  0.703  0.694  1.0
  O  O25  1  0.051  0.297  0.806  1.0
  O  O26  1  0.948  0.894  0.912  1.0
  O  O27  1  0.651  0.248  0.950  1.0
[/CIF]
.