The compound described by Y6O5F8 crystallizes in the triclinic P1 space group. There are six inequivalent Y sites. In the first Y site, Y(1) is bonded in a 7-coordinate geometry to one O(1), one O(4), one O(5), one F(1), one F(2), one F(5), one F(6), and one F(8) atom. In the second Y site, Y(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(5), one F(2), one F(3), one F(4), and one F(8) atom. In the third Y site, Y(3) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(4), one F(3), one F(5), one F(6), and one F(7) atom. In the fourth Y site, Y(4) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one F(1), one F(3), one F(4), one F(6), and one F(7) atom. In the fifth Y site, Y(5) is bonded in a 8-coordinate geometry to one O(1), one O(4), one O(5), one F(1), one F(5), one F(6), one F(7), and one F(8) atom. In the sixth Y site, Y(6) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(5), one F(2), one F(4), and one F(8) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Y(1), one Y(2), one Y(5), and one Y(6) atom to form OY4 tetrahedra that share corners with two equivalent O(3)Y4 tetrahedra, corners with two equivalent O(4)Y4 tetrahedra,  an edgeedge with one O(2)Y4 tetrahedra, edges with two equivalent O(5)Y4 tetrahedra, and  an edgeedge with one F(6)Y4 trigonal pyramid. In the second O site, O(2) is bonded to one Y(2), one Y(3), one Y(4), and one Y(6) atom to form OY4 tetrahedra that share corners with two equivalent O(5)Y4 tetrahedra, corners with two equivalent F(6)Y4 trigonal pyramids,  an edgeedge with one O(1)Y4 tetrahedra,  an edgeedge with one O(4)Y4 tetrahedra, and edges with two equivalent O(3)Y4 tetrahedra. In the third O site, O(3) is bonded to one Y(2), one Y(3), one Y(4), and one Y(6) atom to form OY4 tetrahedra that share corners with two equivalent O(1)Y4 tetrahedra, corners with two equivalent O(4)Y4 tetrahedra,  an edgeedge with one O(5)Y4 tetrahedra, edges with two equivalent O(2)Y4 tetrahedra, and  an edgeedge with one F(6)Y4 trigonal pyramid. In the fourth O site, O(4) is bonded to one Y(1), one Y(3), one Y(4), and one Y(5) atom to form OY4 tetrahedra that share corners with two equivalent O(1)Y4 tetrahedra, corners with two equivalent O(3)Y4 tetrahedra,  an edgeedge with one O(2)Y4 tetrahedra,  an edgeedge with one O(5)Y4 tetrahedra, and edges with two equivalent F(6)Y4 trigonal pyramids. In the fifth O site, O(5) is bonded to one Y(1), one Y(2), one Y(5), and one Y(6) atom to form OY4 tetrahedra that share corners with two equivalent O(2)Y4 tetrahedra, corners with two equivalent F(6)Y4 trigonal pyramids,  an edgeedge with one O(3)Y4 tetrahedra,  an edgeedge with one O(4)Y4 tetrahedra, and edges with two equivalent O(1)Y4 tetrahedra. There are eight inequivalent F sites. In the first F site, F(1) is bonded in a trigonal planar geometry to one Y(1), one Y(4), and one Y(5) atom. In the second F site, F(2) is bonded in a distorted trigonal planar geometry to one Y(1), one Y(2), and one Y(6) atom. In the third F site, F(3) is bonded in a distorted trigonal planar geometry to one Y(2), one Y(3), and one Y(4) atom. In the fourth F site, F(4) is bonded in a trigonal planar geometry to one Y(2), one Y(4), and one Y(6) atom. In the fifth F site, F(5) is bonded in a distorted trigonal planar geometry to one Y(1), one Y(3), and one Y(5) atom. In the sixth F site, F(6) is bonded to one Y(1), one Y(3), one Y(4), and one Y(5) atom to form distorted FY4 trigonal pyramids that share corners with two equivalent O(2)Y4 tetrahedra, corners with two equivalent O(5)Y4 tetrahedra,  an edgeedge with one O(1)Y4 tetrahedra,  an edgeedge with one O(3)Y4 tetrahedra, and edges with two equivalent O(4)Y4 tetrahedra. In the seventh F site, F(7) is bonded in a distorted trigonal non-coplanar geometry to one Y(3), one Y(4), and one Y(5) atom. In the eighth F site, F(8) is bonded in a 4-coordinate geometry to one Y(1), one Y(2), one Y(5), and one Y(6) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Y6O5F8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.517
_cell_length_b   5.578
_cell_length_c   8.726
_cell_angle_alpha   74.911
_cell_angle_beta   88.465
_cell_angle_gamma   89.246
_symmetry_Int_Tables_number   1
_cell_volume   259.149
_cell_formula_units_Z   1
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  0.215  0.933  0.653  1.0
  Y  Y1  1  0.192  0.581  0.339  1.0
  Y  Y2  1  0.792  0.730  0.003  1.0
  Y  Y3  1  0.219  0.200  0.023  1.0
  Y  Y4  1  0.782  0.398  0.687  1.0
  Y  Y5  1  0.786  0.093  0.345  1.0
  O  O6  1  0.970  0.739  0.518  1.0
  O  O7  1  0.976  0.909  0.179  1.0
  O  O8  1  0.986  0.419  0.166  1.0
  O  O9  1  0.982  0.053  0.842  1.0
  O  O10  1  0.011  0.248  0.505  1.0
  F  F11  1  0.442  0.154  0.790  1.0
  F  F12  1  0.441  0.866  0.433  1.0
  F  F13  1  0.447  0.832  0.111  1.0
  F  F14  1  0.443  0.301  0.225  1.0
  F  F15  1  0.581  0.741  0.739  1.0
  F  F16  1  0.083  0.560  0.838  1.0
  F  F17  1  0.635  0.372  0.959  1.0
  F  F18  1  0.523  0.363  0.495  1.0
[/CIF]
.
The compound described by Y6O5F8 crystallizes in the triclinic P1 space group. There are six inequivalent Y sites. In the first Y site, Y(1) is bonded in a 7-coordinate geometry to one O(1), one O(4), one O(5), one F(1), one F(2), one F(5), one F(6), and one F(8) atom. In the second Y site, Y(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(5), one F(2), one F(3), one F(4), and one F(8) atom. In the third Y site, Y(3) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(4), one F(3), one F(5), one F(6), and one F(7) atom. In the fourth Y site, Y(4) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one F(1), one F(3), one F(4), one F(6), and one F(7) atom. In the fifth Y site, Y(5) is bonded in a 8-coordinate geometry to one O(1), one O(4), one O(5), one F(1), one F(5), one F(6), one F(7), and one F(8) atom. In the sixth Y site, Y(6) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(5), one F(2), one F(4), and one F(8) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Y(1), one Y(2), one Y(5), and one Y(6) atom to form OY4 tetrahedra that share corners with two equivalent O(3)Y4 tetrahedra, corners with two equivalent O(4)Y4 tetrahedra,  an edgeedge with one O(2)Y4 tetrahedra, edges with two equivalent O(5)Y4 tetrahedra, and  an edgeedge with one F(6)Y4 trigonal pyramid. In the second O site, O(2) is bonded to one Y(2), one Y(3), one Y(4), and one Y(6) atom to form OY4 tetrahedra that share corners with two equivalent O(5)Y4 tetrahedra, corners with two equivalent F(6)Y4 trigonal pyramids,  an edgeedge with one O(1)Y4 tetrahedra,  an edgeedge with one O(4)Y4 tetrahedra, and edges with two equivalent O(3)Y4 tetrahedra. In the third O site, O(3) is bonded to one Y(2), one Y(3), one Y(4), and one Y(6) atom to form OY4 tetrahedra that share corners with two equivalent O(1)Y4 tetrahedra, corners with two equivalent O(4)Y4 tetrahedra,  an edgeedge with one O(5)Y4 tetrahedra, edges with two equivalent O(2)Y4 tetrahedra, and  an edgeedge with one F(6)Y4 trigonal pyramid. In the fourth O site, O(4) is bonded to one Y(1), one Y(3), one Y(4), and one Y(5) atom to form OY4 tetrahedra that share corners with two equivalent O(1)Y4 tetrahedra, corners with two equivalent O(3)Y4 tetrahedra,  an edgeedge with one O(2)Y4 tetrahedra,  an edgeedge with one O(5)Y4 tetrahedra, and edges with two equivalent F(6)Y4 trigonal pyramids. In the fifth O site, O(5) is bonded to one Y(1), one Y(2), one Y(5), and one Y(6) atom to form OY4 tetrahedra that share corners with two equivalent O(2)Y4 tetrahedra, corners with two equivalent F(6)Y4 trigonal pyramids,  an edgeedge with one O(3)Y4 tetrahedra,  an edgeedge with one O(4)Y4 tetrahedra, and edges with two equivalent O(1)Y4 tetrahedra. There are eight inequivalent F sites. In the first F site, F(1) is bonded in a trigonal planar geometry to one Y(1), one Y(4), and one Y(5) atom. In the second F site, F(2) is bonded in a distorted trigonal planar geometry to one Y(1), one Y(2), and one Y(6) atom. In the third F site, F(3) is bonded in a distorted trigonal planar geometry to one Y(2), one Y(3), and one Y(4) atom. In the fourth F site, F(4) is bonded in a trigonal planar geometry to one Y(2), one Y(4), and one Y(6) atom. In the fifth F site, F(5) is bonded in a distorted trigonal planar geometry to one Y(1), one Y(3), and one Y(5) atom. In the sixth F site, F(6) is bonded to one Y(1), one Y(3), one Y(4), and one Y(5) atom to form distorted FY4 trigonal pyramids that share corners with two equivalent O(2)Y4 tetrahedra, corners with two equivalent O(5)Y4 tetrahedra,  an edgeedge with one O(1)Y4 tetrahedra,  an edgeedge with one O(3)Y4 tetrahedra, and edges with two equivalent O(4)Y4 tetrahedra. In the seventh F site, F(7) is bonded in a distorted trigonal non-coplanar geometry to one Y(3), one Y(4), and one Y(5) atom. In the eighth F site, F(8) is bonded in a 4-coordinate geometry to one Y(1), one Y(2), one Y(5), and one Y(6) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Y6O5F8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.517
_cell_length_b   5.578
_cell_length_c   8.726
_cell_angle_alpha   74.911
_cell_angle_beta   88.465
_cell_angle_gamma   89.246
_symmetry_Int_Tables_number   1
_cell_volume   259.149
_cell_formula_units_Z   1
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  0.215  0.933  0.653  1.0
  Y  Y1  1  0.192  0.581  0.339  1.0
  Y  Y2  1  0.792  0.730  0.003  1.0
  Y  Y3  1  0.219  0.200  0.023  1.0
  Y  Y4  1  0.782  0.398  0.687  1.0
  Y  Y5  1  0.786  0.093  0.345  1.0
  O  O6  1  0.970  0.739  0.518  1.0
  O  O7  1  0.976  0.909  0.179  1.0
  O  O8  1  0.986  0.419  0.166  1.0
  O  O9  1  0.982  0.053  0.842  1.0
  O  O10  1  0.011  0.248  0.505  1.0
  F  F11  1  0.442  0.154  0.790  1.0
  F  F12  1  0.441  0.866  0.433  1.0
  F  F13  1  0.447  0.832  0.111  1.0
  F  F14  1  0.443  0.301  0.225  1.0
  F  F15  1  0.581  0.741  0.739  1.0
  F  F16  1  0.083  0.560  0.838  1.0
  F  F17  1  0.635  0.372  0.959  1.0
  F  F18  1  0.523  0.363  0.495  1.0
[/CIF]
.