The crystal structure described by Y2Hg2O5 crystallizes in the triclinic P-1 space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 6-coordinate geometry to one O(4), one O(5), two equivalent O(1), and two equivalent O(2) atoms. In the second Y site, Y(2) is bonded to one O(2), two equivalent O(5), and three equivalent O(3) atoms to form distorted edge-sharing YO6 octahedra. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a distorted T-shaped geometry to one O(1), one O(4), and one O(5) atom. In the second Hg site, Hg(2) is bonded in a 3-coordinate geometry to one O(2), one O(3), and one O(4) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Y(1) and one Hg(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Y(2), two equivalent Y(1), and one Hg(2) atom. In the third O site, O(3) is bonded to three equivalent Y(2) and one Hg(2) atom to form a mixture of corner and edge-sharing OY3Hg trigonal pyramids. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Y(1), one Hg(1), and one Hg(2) atom. In the fifth O site, O(5) is bonded to one Y(1), two equivalent Y(2), and one Hg(1) atom to form a mixture of corner and edge-sharing OY3Hg trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Y2Hg2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.554
_cell_length_b   7.675
_cell_length_c   11.634
_cell_angle_alpha   83.754
_cell_angle_beta   87.470
_cell_angle_gamma   84.601
_symmetry_Int_Tables_number   1
_cell_volume   313.844
_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
  Y  Y0  1  0.165  0.820  0.828  1.0
  Y  Y1  1  0.728  0.619  0.611  1.0
  Y  Y2  1  0.835  0.180  0.172  1.0
  Y  Y3  1  0.272  0.381  0.389  1.0
  Hg  Hg4  1  0.713  0.633  0.111  1.0
  Hg  Hg5  1  0.834  0.178  0.671  1.0
  Hg  Hg6  1  0.166  0.822  0.329  1.0
  Hg  Hg7  1  0.287  0.367  0.889  1.0
  O  O8  1  0.669  0.715  0.937  1.0
  O  O9  1  0.670  0.852  0.698  1.0
  O  O10  1  0.240  0.661  0.484  1.0
  O  O11  1  0.006  0.895  0.163  1.0
  O  O12  1  0.994  0.105  0.837  1.0
  O  O13  1  0.330  0.148  0.302  1.0
  O  O14  1  0.331  0.285  0.063  1.0
  O  O15  1  0.232  0.535  0.731  1.0
  O  O16  1  0.760  0.339  0.516  1.0
  O  O17  1  0.768  0.465  0.269  1.0
[/CIF]
.
The crystal structure described by Y2Hg2O5 crystallizes in the triclinic P-1 space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 6-coordinate geometry to one O(4), one O(5), two equivalent O(1), and two equivalent O(2) atoms. In the second Y site, Y(2) is bonded to one O(2), two equivalent O(5), and three equivalent O(3) atoms to form distorted edge-sharing YO6 octahedra. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a distorted T-shaped geometry to one O(1), one O(4), and one O(5) atom. In the second Hg site, Hg(2) is bonded in a 3-coordinate geometry to one O(2), one O(3), and one O(4) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Y(1) and one Hg(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Y(2), two equivalent Y(1), and one Hg(2) atom. In the third O site, O(3) is bonded to three equivalent Y(2) and one Hg(2) atom to form a mixture of corner and edge-sharing OY3Hg trigonal pyramids. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Y(1), one Hg(1), and one Hg(2) atom. In the fifth O site, O(5) is bonded to one Y(1), two equivalent Y(2), and one Hg(1) atom to form a mixture of corner and edge-sharing OY3Hg trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Y2Hg2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.554
_cell_length_b   7.675
_cell_length_c   11.634
_cell_angle_alpha   83.754
_cell_angle_beta   87.470
_cell_angle_gamma   84.601
_symmetry_Int_Tables_number   1
_cell_volume   313.844
_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
  Y  Y0  1  0.165  0.820  0.828  1.0
  Y  Y1  1  0.728  0.619  0.611  1.0
  Y  Y2  1  0.835  0.180  0.172  1.0
  Y  Y3  1  0.272  0.381  0.389  1.0
  Hg  Hg4  1  0.713  0.633  0.111  1.0
  Hg  Hg5  1  0.834  0.178  0.671  1.0
  Hg  Hg6  1  0.166  0.822  0.329  1.0
  Hg  Hg7  1  0.287  0.367  0.889  1.0
  O  O8  1  0.669  0.715  0.937  1.0
  O  O9  1  0.670  0.852  0.698  1.0
  O  O10  1  0.240  0.661  0.484  1.0
  O  O11  1  0.006  0.895  0.163  1.0
  O  O12  1  0.994  0.105  0.837  1.0
  O  O13  1  0.330  0.148  0.302  1.0
  O  O14  1  0.331  0.285  0.063  1.0
  O  O15  1  0.232  0.535  0.731  1.0
  O  O16  1  0.760  0.339  0.516  1.0
  O  O17  1  0.768  0.465  0.269  1.0
[/CIF]
.