The crystal structure described by Dy4B4O11F2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 10-coordinate geometry to one O(1), one O(2), one O(4), two equivalent O(3), two equivalent O(5), two equivalent O(6), and one F(1) atom. In the second Dy site, Dy(2) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(5), one O(6), two equivalent O(2), and three equivalent F(1) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded to one O(1), one O(2), one O(4), and one O(6) atom to form corner-sharing BO4 tetrahedra. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1), one O(3), and one O(5) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Dy(1), one Dy(2), one B(1), and one B(2) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one Dy(1), two equivalent Dy(2), and one B(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Dy(2), two equivalent Dy(1), and one B(2) atom. In the fourth O site, O(4) is bonded to two equivalent Dy(1) and two equivalent B(1) atoms to form distorted ODy2B2 tetrahedra that share corners with two equivalent F(1)Dy4 tetrahedra. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Dy(2), two equivalent Dy(1), and one B(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Dy(2), two equivalent Dy(1), and one B(1) atom. F(1) is bonded to one Dy(1) and three equivalent Dy(2) atoms to form distorted FDy4 tetrahedra that share  a cornercorner with one O(4)Dy2B2 tetrahedra, corners with two equivalent F(1)Dy4 tetrahedra, and edges with two equivalent F(1)Dy4 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Dy4B4O11F2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.147
_cell_length_b   7.147
_cell_length_c   13.670
_cell_angle_alpha   88.755
_cell_angle_beta   88.755
_cell_angle_gamma   37.779
_symmetry_Int_Tables_number   1
_cell_volume   427.704
_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
  Dy  Dy0  1  0.459  0.423  0.370  1.0
  Dy  Dy1  1  0.577  0.541  0.130  1.0
  Dy  Dy2  1  0.541  0.577  0.630  1.0
  Dy  Dy3  1  0.423  0.459  0.870  1.0
  Dy  Dy4  1  0.734  0.705  0.370  1.0
  Dy  Dy5  1  0.295  0.266  0.130  1.0
  Dy  Dy6  1  0.266  0.295  0.630  1.0
  Dy  Dy7  1  0.705  0.734  0.870  1.0
  B  B8  1  0.068  0.119  0.286  1.0
  B  B9  1  0.881  0.932  0.214  1.0
  B  B10  1  0.932  0.881  0.714  1.0
  B  B11  1  0.119  0.068  0.786  1.0
  B  B12  1  0.861  0.946  0.523  1.0
  B  B13  1  0.054  0.139  0.977  1.0
  B  B14  1  0.139  0.054  0.477  1.0
  B  B15  1  0.946  0.861  0.023  1.0
  O  O16  1  0.950  0.226  0.395  1.0
  O  O17  1  0.774  0.050  0.105  1.0
  O  O18  1  0.050  0.774  0.605  1.0
  O  O19  1  0.226  0.950  0.895  1.0
  O  O20  1  0.637  0.010  0.257  1.0
  O  O21  1  0.990  0.363  0.243  1.0
  O  O22  1  0.363  0.990  0.743  1.0
  O  O23  1  0.010  0.637  0.757  1.0
  O  O24  1  0.587  0.255  0.534  1.0
  O  O25  1  0.745  0.413  0.966  1.0
  O  O26  1  0.413  0.745  0.466  1.0
  O  O27  1  0.255  0.587  0.034  1.0
  O  O28  1  0.840  0.160  0.250  1.0
  O  O29  1  0.160  0.840  0.750  1.0
  O  O30  1  0.948  0.820  0.432  1.0
  O  O31  1  0.180  0.052  0.068  1.0
  O  O32  1  0.052  0.180  0.568  1.0
  O  O33  1  0.820  0.948  0.932  1.0
  O  O34  1  0.379  0.818  0.276  1.0
  O  O35  1  0.182  0.621  0.224  1.0
  O  O36  1  0.621  0.182  0.724  1.0
  O  O37  1  0.818  0.379  0.776  1.0
  F  F38  1  0.296  0.242  0.424  1.0
  F  F39  1  0.758  0.704  0.076  1.0
  F  F40  1  0.704  0.758  0.576  1.0
  F  F41  1  0.242  0.296  0.924  1.0
[/CIF]
.
The crystal structure described by Dy4B4O11F2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 10-coordinate geometry to one O(1), one O(2), one O(4), two equivalent O(3), two equivalent O(5), two equivalent O(6), and one F(1) atom. In the second Dy site, Dy(2) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(5), one O(6), two equivalent O(2), and three equivalent F(1) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded to one O(1), one O(2), one O(4), and one O(6) atom to form corner-sharing BO4 tetrahedra. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1), one O(3), and one O(5) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Dy(1), one Dy(2), one B(1), and one B(2) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one Dy(1), two equivalent Dy(2), and one B(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Dy(2), two equivalent Dy(1), and one B(2) atom. In the fourth O site, O(4) is bonded to two equivalent Dy(1) and two equivalent B(1) atoms to form distorted ODy2B2 tetrahedra that share corners with two equivalent F(1)Dy4 tetrahedra. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Dy(2), two equivalent Dy(1), and one B(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Dy(2), two equivalent Dy(1), and one B(1) atom. F(1) is bonded to one Dy(1) and three equivalent Dy(2) atoms to form distorted FDy4 tetrahedra that share  a cornercorner with one O(4)Dy2B2 tetrahedra, corners with two equivalent F(1)Dy4 tetrahedra, and edges with two equivalent F(1)Dy4 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Dy4B4O11F2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.147
_cell_length_b   7.147
_cell_length_c   13.670
_cell_angle_alpha   88.755
_cell_angle_beta   88.755
_cell_angle_gamma   37.779
_symmetry_Int_Tables_number   1
_cell_volume   427.704
_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
  Dy  Dy0  1  0.459  0.423  0.370  1.0
  Dy  Dy1  1  0.577  0.541  0.130  1.0
  Dy  Dy2  1  0.541  0.577  0.630  1.0
  Dy  Dy3  1  0.423  0.459  0.870  1.0
  Dy  Dy4  1  0.734  0.705  0.370  1.0
  Dy  Dy5  1  0.295  0.266  0.130  1.0
  Dy  Dy6  1  0.266  0.295  0.630  1.0
  Dy  Dy7  1  0.705  0.734  0.870  1.0
  B  B8  1  0.068  0.119  0.286  1.0
  B  B9  1  0.881  0.932  0.214  1.0
  B  B10  1  0.932  0.881  0.714  1.0
  B  B11  1  0.119  0.068  0.786  1.0
  B  B12  1  0.861  0.946  0.523  1.0
  B  B13  1  0.054  0.139  0.977  1.0
  B  B14  1  0.139  0.054  0.477  1.0
  B  B15  1  0.946  0.861  0.023  1.0
  O  O16  1  0.950  0.226  0.395  1.0
  O  O17  1  0.774  0.050  0.105  1.0
  O  O18  1  0.050  0.774  0.605  1.0
  O  O19  1  0.226  0.950  0.895  1.0
  O  O20  1  0.637  0.010  0.257  1.0
  O  O21  1  0.990  0.363  0.243  1.0
  O  O22  1  0.363  0.990  0.743  1.0
  O  O23  1  0.010  0.637  0.757  1.0
  O  O24  1  0.587  0.255  0.534  1.0
  O  O25  1  0.745  0.413  0.966  1.0
  O  O26  1  0.413  0.745  0.466  1.0
  O  O27  1  0.255  0.587  0.034  1.0
  O  O28  1  0.840  0.160  0.250  1.0
  O  O29  1  0.160  0.840  0.750  1.0
  O  O30  1  0.948  0.820  0.432  1.0
  O  O31  1  0.180  0.052  0.068  1.0
  O  O32  1  0.052  0.180  0.568  1.0
  O  O33  1  0.820  0.948  0.932  1.0
  O  O34  1  0.379  0.818  0.276  1.0
  O  O35  1  0.182  0.621  0.224  1.0
  O  O36  1  0.621  0.182  0.724  1.0
  O  O37  1  0.818  0.379  0.776  1.0
  F  F38  1  0.296  0.242  0.424  1.0
  F  F39  1  0.758  0.704  0.076  1.0
  F  F40  1  0.704  0.758  0.576  1.0
  F  F41  1  0.242  0.296  0.924  1.0
[/CIF]
.