The crystal structure described by Ce8Fe8As8O7F crystallizes in the orthorhombic F222 space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 4-coordinate geometry to two equivalent As(1), two equivalent As(2), one O(1), one O(2), one O(3), and one F(1) atom. In the second Ce site, Ce(2) is bonded in a 4-coordinate geometry to two equivalent As(1), two equivalent As(2), one O(1), one O(2), one O(3), and one O(4) atom. There are five inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent As(1) and two equivalent As(2) atoms to form a mixture of distorted corner and edge-sharing FeAs4 tetrahedra. In the second Fe site, Fe(3) is bonded to two equivalent As(1) and two equivalent As(2) atoms to form a mixture of distorted corner and edge-sharing FeAs4 tetrahedra. In the third Fe site, Fe(2) is bonded to four equivalent As(1) atoms to form a mixture of distorted corner and edge-sharing FeAs4 tetrahedra. In the fourth Fe site, Fe(4) is bonded to two equivalent As(1) and two equivalent As(2) atoms to form a mixture of distorted corner and edge-sharing FeAs4 tetrahedra. In the fifth Fe site, Fe(5) is bonded in a 4-coordinate geometry to four equivalent As(2) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to two equivalent Ce(1), two equivalent Ce(2), one Fe(1), one Fe(2), one Fe(3), and one Fe(4) atom. In the second As site, As(2) is bonded in a 8-coordinate geometry to two equivalent Ce(1), two equivalent Ce(2), one Fe(1), one Fe(3), one Fe(4), and one Fe(5) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ce(1) and two equivalent Ce(2) atoms to form OCe4 tetrahedra that share corners with four equivalent O(2)Ce4 tetrahedra,  an edgeedge with one O(4)Ce4 tetrahedra,  an edgeedge with one F(1)Ce4 tetrahedra, and edges with two equivalent O(3)Ce4 tetrahedra. In the second O site, O(2) is bonded to two equivalent Ce(1) and two equivalent Ce(2) atoms to form OCe4 tetrahedra that share corners with four equivalent O(1)Ce4 tetrahedra,  an edgeedge with one O(4)Ce4 tetrahedra,  an edgeedge with one F(1)Ce4 tetrahedra, and edges with two equivalent O(3)Ce4 tetrahedra. In the third O site, O(3) is bonded to two equivalent Ce(1) and two equivalent Ce(2) atoms to form OCe4 tetrahedra that share corners with two equivalent O(4)Ce4 tetrahedra, corners with two equivalent F(1)Ce4 tetrahedra, edges with two equivalent O(1)Ce4 tetrahedra, and edges with two equivalent O(2)Ce4 tetrahedra. In the fourth O site, O(4) is bonded to four equivalent Ce(2) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. F(1) is bonded to four equivalent Ce(1) atoms to form FCe4 tetrahedra that share corners with four equivalent O(3)Ce4 tetrahedra, edges with two equivalent O(1)Ce4 tetrahedra, and edges with two equivalent O(2)Ce4 tetrahedra. is represented by the CIF file [CIF]
data_Ce8Fe8As8O7F
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.952
_cell_length_b   7.952
_cell_length_c   10.563
_cell_angle_alpha   67.869
_cell_angle_beta   67.869
_cell_angle_gamma   89.954
_symmetry_Int_Tables_number   1
_cell_volume   565.377
_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
  Ce  Ce0  1  0.062  0.552  0.148  1.0
  Ce  Ce1  1  0.056  0.056  0.139  1.0
  Ce  Ce2  1  0.540  0.550  0.148  1.0
  Ce  Ce3  1  0.555  0.055  0.139  1.0
  Ce  Ce4  1  0.445  0.945  0.861  1.0
  Ce  Ce5  1  0.444  0.444  0.861  1.0
  Ce  Ce6  1  0.950  0.960  0.852  1.0
  Ce  Ce7  1  0.948  0.438  0.852  1.0
  Fe  Fe8  1  0.125  0.875  0.501  1.0
  Fe  Fe9  1  0.125  0.375  0.500  1.0
  Fe  Fe10  1  0.378  0.628  0.500  1.0
  Fe  Fe11  1  0.377  0.123  0.500  1.0
  Fe  Fe12  1  0.625  0.875  0.500  1.0
  Fe  Fe13  1  0.625  0.375  0.499  1.0
  Fe  Fe14  1  0.873  0.627  0.500  1.0
  Fe  Fe15  1  0.872  0.122  0.500  1.0
  As  As16  1  0.219  0.718  0.314  1.0
  As  As17  1  0.217  0.218  0.314  1.0
  As  As18  1  0.279  0.780  0.690  1.0
  As  As19  1  0.282  0.283  0.686  1.0
  As  As20  1  0.720  0.719  0.310  1.0
  As  As21  1  0.720  0.221  0.310  1.0
  As  As22  1  0.781  0.780  0.690  1.0
  As  As23  1  0.782  0.281  0.686  1.0
  O  O24  1  0.122  0.872  0.000  1.0
  O  O25  1  0.122  0.378  0.000  1.0
  O  O26  1  0.374  0.624  0.003  1.0
  O  O27  1  0.375  0.125  0.000  1.0
  O  O28  1  0.628  0.872  0.000  1.0
  O  O29  1  0.628  0.378  0.000  1.0
  O  O30  1  0.876  0.126  0.997  1.0
  F  F31  1  0.875  0.625  0.000  1.0
[/CIF]
.
The crystal structure described by Ce8Fe8As8O7F crystallizes in the orthorhombic F222 space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 4-coordinate geometry to two equivalent As(1), two equivalent As(2), one O(1), one O(2), one O(3), and one F(1) atom. In the second Ce site, Ce(2) is bonded in a 4-coordinate geometry to two equivalent As(1), two equivalent As(2), one O(1), one O(2), one O(3), and one O(4) atom. There are five inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent As(1) and two equivalent As(2) atoms to form a mixture of distorted corner and edge-sharing FeAs4 tetrahedra. In the second Fe site, Fe(3) is bonded to two equivalent As(1) and two equivalent As(2) atoms to form a mixture of distorted corner and edge-sharing FeAs4 tetrahedra. In the third Fe site, Fe(2) is bonded to four equivalent As(1) atoms to form a mixture of distorted corner and edge-sharing FeAs4 tetrahedra. In the fourth Fe site, Fe(4) is bonded to two equivalent As(1) and two equivalent As(2) atoms to form a mixture of distorted corner and edge-sharing FeAs4 tetrahedra. In the fifth Fe site, Fe(5) is bonded in a 4-coordinate geometry to four equivalent As(2) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to two equivalent Ce(1), two equivalent Ce(2), one Fe(1), one Fe(2), one Fe(3), and one Fe(4) atom. In the second As site, As(2) is bonded in a 8-coordinate geometry to two equivalent Ce(1), two equivalent Ce(2), one Fe(1), one Fe(3), one Fe(4), and one Fe(5) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ce(1) and two equivalent Ce(2) atoms to form OCe4 tetrahedra that share corners with four equivalent O(2)Ce4 tetrahedra,  an edgeedge with one O(4)Ce4 tetrahedra,  an edgeedge with one F(1)Ce4 tetrahedra, and edges with two equivalent O(3)Ce4 tetrahedra. In the second O site, O(2) is bonded to two equivalent Ce(1) and two equivalent Ce(2) atoms to form OCe4 tetrahedra that share corners with four equivalent O(1)Ce4 tetrahedra,  an edgeedge with one O(4)Ce4 tetrahedra,  an edgeedge with one F(1)Ce4 tetrahedra, and edges with two equivalent O(3)Ce4 tetrahedra. In the third O site, O(3) is bonded to two equivalent Ce(1) and two equivalent Ce(2) atoms to form OCe4 tetrahedra that share corners with two equivalent O(4)Ce4 tetrahedra, corners with two equivalent F(1)Ce4 tetrahedra, edges with two equivalent O(1)Ce4 tetrahedra, and edges with two equivalent O(2)Ce4 tetrahedra. In the fourth O site, O(4) is bonded to four equivalent Ce(2) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. F(1) is bonded to four equivalent Ce(1) atoms to form FCe4 tetrahedra that share corners with four equivalent O(3)Ce4 tetrahedra, edges with two equivalent O(1)Ce4 tetrahedra, and edges with two equivalent O(2)Ce4 tetrahedra. is represented by the CIF file [CIF]
data_Ce8Fe8As8O7F
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.952
_cell_length_b   7.952
_cell_length_c   10.563
_cell_angle_alpha   67.869
_cell_angle_beta   67.869
_cell_angle_gamma   89.954
_symmetry_Int_Tables_number   1
_cell_volume   565.377
_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
  Ce  Ce0  1  0.062  0.552  0.148  1.0
  Ce  Ce1  1  0.056  0.056  0.139  1.0
  Ce  Ce2  1  0.540  0.550  0.148  1.0
  Ce  Ce3  1  0.555  0.055  0.139  1.0
  Ce  Ce4  1  0.445  0.945  0.861  1.0
  Ce  Ce5  1  0.444  0.444  0.861  1.0
  Ce  Ce6  1  0.950  0.960  0.852  1.0
  Ce  Ce7  1  0.948  0.438  0.852  1.0
  Fe  Fe8  1  0.125  0.875  0.501  1.0
  Fe  Fe9  1  0.125  0.375  0.500  1.0
  Fe  Fe10  1  0.378  0.628  0.500  1.0
  Fe  Fe11  1  0.377  0.123  0.500  1.0
  Fe  Fe12  1  0.625  0.875  0.500  1.0
  Fe  Fe13  1  0.625  0.375  0.499  1.0
  Fe  Fe14  1  0.873  0.627  0.500  1.0
  Fe  Fe15  1  0.872  0.122  0.500  1.0
  As  As16  1  0.219  0.718  0.314  1.0
  As  As17  1  0.217  0.218  0.314  1.0
  As  As18  1  0.279  0.780  0.690  1.0
  As  As19  1  0.282  0.283  0.686  1.0
  As  As20  1  0.720  0.719  0.310  1.0
  As  As21  1  0.720  0.221  0.310  1.0
  As  As22  1  0.781  0.780  0.690  1.0
  As  As23  1  0.782  0.281  0.686  1.0
  O  O24  1  0.122  0.872  0.000  1.0
  O  O25  1  0.122  0.378  0.000  1.0
  O  O26  1  0.374  0.624  0.003  1.0
  O  O27  1  0.375  0.125  0.000  1.0
  O  O28  1  0.628  0.872  0.000  1.0
  O  O29  1  0.628  0.378  0.000  1.0
  O  O30  1  0.876  0.126  0.997  1.0
  F  F31  1  0.875  0.625  0.000  1.0
[/CIF]
.