The compound described by Ba6Y2Fe4O15 crystallizes in the monoclinic P2/c space group. There are four inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms. In the second Ba site, Ba(2) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(4), two equivalent O(5), and two equivalent O(8) atoms. In the third Ba site, Ba(3) is bonded in a 9-coordinate geometry to one O(1), one O(5), one O(8), two equivalent O(2), two equivalent O(6), and two equivalent O(7) atoms. In the fourth Ba site, Ba(4) is bonded in a 10-coordinate geometry to one O(4), one O(5), one O(8), two equivalent O(6), two equivalent O(7), and three equivalent O(3) atoms. Y(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form YO6 octahedra that share corners with two equivalent Fe(2)O4 tetrahedra and corners with four equivalent Fe(1)O4 tetrahedra. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2), one O(3), one O(6), and one O(7) atom to form FeO4 tetrahedra that share corners with four equivalent Y(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 7-37°. In the second Fe site, Fe(2) is bonded to one O(1), one O(4), one O(5), and one O(8) atom to form FeO4 tetrahedra that share corners with two equivalent Y(1)O6 octahedra and  a cornercorner with one Fe(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 11-37°. There are eight inequivalent O sites. In the first O site, O(4) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Ba(4), one Y(1), and one Fe(2) atom. In the second O site, O(5) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(2), one Ba(3), one Ba(4), one Y(1), and one Fe(2) atom. In the third O site, O(6) is bonded in a 6-coordinate geometry to two equivalent Ba(3), two equivalent Ba(4), one Y(1), and one Fe(1) atom. In the fourth O site, O(7) is bonded in a 6-coordinate geometry to two equivalent Ba(3), two equivalent Ba(4), one Y(1), and one Fe(1) atom. In the fifth O site, O(8) is bonded in a 4-coordinate geometry to one Ba(2), one Ba(3), one Ba(4), and one Fe(2) atom. In the sixth O site, O(1) is bonded in a distorted linear geometry to two equivalent Ba(1), two equivalent Ba(3), and two equivalent Fe(2) atoms. In the seventh O site, O(2) is bonded in a 5-coordinate geometry to one Ba(1), two equivalent Ba(3), one Y(1), and one Fe(1) atom. In the eighth O site, O(3) is bonded in a 6-coordinate geometry to one Ba(2), three equivalent Ba(4), one Y(1), and one Fe(1) atom. is represented by the CIF card [CIF]
data_Ba6Y2Fe4O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.993
_cell_length_b   8.066
_cell_length_c   18.509
_cell_angle_alpha   88.791
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   894.586
_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
  Ba  Ba0  1  0.282  0.000  0.250  1.0
  Ba  Ba1  1  0.718  0.000  0.750  1.0
  Ba  Ba2  1  0.331  0.500  0.250  1.0
  Ba  Ba3  1  0.669  0.500  0.750  1.0
  Ba  Ba4  1  0.750  0.975  0.089  1.0
  Ba  Ba5  1  0.750  0.025  0.411  1.0
  Ba  Ba6  1  0.250  0.025  0.911  1.0
  Ba  Ba7  1  0.250  0.975  0.589  1.0
  Ba  Ba8  1  0.246  0.500  0.577  1.0
  Ba  Ba9  1  0.246  0.500  0.923  1.0
  Ba  Ba10  1  0.754  0.500  0.423  1.0
  Ba  Ba11  1  0.754  0.500  0.077  1.0
  Y  Y12  1  0.252  0.754  0.409  1.0
  Y  Y13  1  0.252  0.246  0.091  1.0
  Y  Y14  1  0.748  0.246  0.591  1.0
  Y  Y15  1  0.748  0.754  0.909  1.0
  Fe  Fe16  1  0.253  0.755  0.060  1.0
  Fe  Fe17  1  0.253  0.245  0.440  1.0
  Fe  Fe18  1  0.747  0.245  0.940  1.0
  Fe  Fe19  1  0.747  0.755  0.560  1.0
  Fe  Fe20  1  0.776  0.769  0.266  1.0
  Fe  Fe21  1  0.776  0.231  0.234  1.0
  Fe  Fe22  1  0.224  0.231  0.734  1.0
  Fe  Fe23  1  0.224  0.769  0.766  1.0
  O  O24  1  0.800  0.000  0.250  1.0
  O  O25  1  0.200  0.000  0.750  1.0
  O  O26  1  0.766  0.958  0.608  1.0
  O  O27  1  0.766  0.042  0.892  1.0
  O  O28  1  0.234  0.042  0.392  1.0
  O  O29  1  0.234  0.958  0.108  1.0
  O  O30  1  0.243  0.529  0.089  1.0
  O  O31  1  0.243  0.471  0.411  1.0
  O  O32  1  0.757  0.471  0.911  1.0
  O  O33  1  0.757  0.529  0.589  1.0
  O  O34  1  0.052  0.723  0.308  1.0
  O  O35  1  0.052  0.277  0.192  1.0
  O  O36  1  0.948  0.277  0.692  1.0
  O  O37  1  0.948  0.723  0.808  1.0
  O  O38  1  0.555  0.749  0.338  1.0
  O  O39  1  0.555  0.251  0.162  1.0
  O  O40  1  0.445  0.251  0.662  1.0
  O  O41  1  0.445  0.749  0.838  1.0
  O  O42  1  0.489  0.766  0.502  1.0
  O  O43  1  0.489  0.234  0.998  1.0
  O  O44  1  0.511  0.234  0.498  1.0
  O  O45  1  0.511  0.766  0.002  1.0
  O  O46  1  0.015  0.768  0.992  1.0
  O  O47  1  0.015  0.232  0.508  1.0
  O  O48  1  0.985  0.232  0.008  1.0
  O  O49  1  0.985  0.768  0.492  1.0
  O  O50  1  0.341  0.694  0.681  1.0
  O  O51  1  0.341  0.306  0.819  1.0
  O  O52  1  0.659  0.306  0.319  1.0
  O  O53  1  0.659  0.694  0.181  1.0
[/CIF]
.
The compound described by Ba6Y2Fe4O15 crystallizes in the monoclinic P2/c space group. There are four inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms. In the second Ba site, Ba(2) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(4), two equivalent O(5), and two equivalent O(8) atoms. In the third Ba site, Ba(3) is bonded in a 9-coordinate geometry to one O(1), one O(5), one O(8), two equivalent O(2), two equivalent O(6), and two equivalent O(7) atoms. In the fourth Ba site, Ba(4) is bonded in a 10-coordinate geometry to one O(4), one O(5), one O(8), two equivalent O(6), two equivalent O(7), and three equivalent O(3) atoms. Y(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form YO6 octahedra that share corners with two equivalent Fe(2)O4 tetrahedra and corners with four equivalent Fe(1)O4 tetrahedra. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2), one O(3), one O(6), and one O(7) atom to form FeO4 tetrahedra that share corners with four equivalent Y(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 7-37°. In the second Fe site, Fe(2) is bonded to one O(1), one O(4), one O(5), and one O(8) atom to form FeO4 tetrahedra that share corners with two equivalent Y(1)O6 octahedra and  a cornercorner with one Fe(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 11-37°. There are eight inequivalent O sites. In the first O site, O(4) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Ba(4), one Y(1), and one Fe(2) atom. In the second O site, O(5) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(2), one Ba(3), one Ba(4), one Y(1), and one Fe(2) atom. In the third O site, O(6) is bonded in a 6-coordinate geometry to two equivalent Ba(3), two equivalent Ba(4), one Y(1), and one Fe(1) atom. In the fourth O site, O(7) is bonded in a 6-coordinate geometry to two equivalent Ba(3), two equivalent Ba(4), one Y(1), and one Fe(1) atom. In the fifth O site, O(8) is bonded in a 4-coordinate geometry to one Ba(2), one Ba(3), one Ba(4), and one Fe(2) atom. In the sixth O site, O(1) is bonded in a distorted linear geometry to two equivalent Ba(1), two equivalent Ba(3), and two equivalent Fe(2) atoms. In the seventh O site, O(2) is bonded in a 5-coordinate geometry to one Ba(1), two equivalent Ba(3), one Y(1), and one Fe(1) atom. In the eighth O site, O(3) is bonded in a 6-coordinate geometry to one Ba(2), three equivalent Ba(4), one Y(1), and one Fe(1) atom. is represented by the CIF card [CIF]
data_Ba6Y2Fe4O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.993
_cell_length_b   8.066
_cell_length_c   18.509
_cell_angle_alpha   88.791
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   894.586
_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
  Ba  Ba0  1  0.282  0.000  0.250  1.0
  Ba  Ba1  1  0.718  0.000  0.750  1.0
  Ba  Ba2  1  0.331  0.500  0.250  1.0
  Ba  Ba3  1  0.669  0.500  0.750  1.0
  Ba  Ba4  1  0.750  0.975  0.089  1.0
  Ba  Ba5  1  0.750  0.025  0.411  1.0
  Ba  Ba6  1  0.250  0.025  0.911  1.0
  Ba  Ba7  1  0.250  0.975  0.589  1.0
  Ba  Ba8  1  0.246  0.500  0.577  1.0
  Ba  Ba9  1  0.246  0.500  0.923  1.0
  Ba  Ba10  1  0.754  0.500  0.423  1.0
  Ba  Ba11  1  0.754  0.500  0.077  1.0
  Y  Y12  1  0.252  0.754  0.409  1.0
  Y  Y13  1  0.252  0.246  0.091  1.0
  Y  Y14  1  0.748  0.246  0.591  1.0
  Y  Y15  1  0.748  0.754  0.909  1.0
  Fe  Fe16  1  0.253  0.755  0.060  1.0
  Fe  Fe17  1  0.253  0.245  0.440  1.0
  Fe  Fe18  1  0.747  0.245  0.940  1.0
  Fe  Fe19  1  0.747  0.755  0.560  1.0
  Fe  Fe20  1  0.776  0.769  0.266  1.0
  Fe  Fe21  1  0.776  0.231  0.234  1.0
  Fe  Fe22  1  0.224  0.231  0.734  1.0
  Fe  Fe23  1  0.224  0.769  0.766  1.0
  O  O24  1  0.800  0.000  0.250  1.0
  O  O25  1  0.200  0.000  0.750  1.0
  O  O26  1  0.766  0.958  0.608  1.0
  O  O27  1  0.766  0.042  0.892  1.0
  O  O28  1  0.234  0.042  0.392  1.0
  O  O29  1  0.234  0.958  0.108  1.0
  O  O30  1  0.243  0.529  0.089  1.0
  O  O31  1  0.243  0.471  0.411  1.0
  O  O32  1  0.757  0.471  0.911  1.0
  O  O33  1  0.757  0.529  0.589  1.0
  O  O34  1  0.052  0.723  0.308  1.0
  O  O35  1  0.052  0.277  0.192  1.0
  O  O36  1  0.948  0.277  0.692  1.0
  O  O37  1  0.948  0.723  0.808  1.0
  O  O38  1  0.555  0.749  0.338  1.0
  O  O39  1  0.555  0.251  0.162  1.0
  O  O40  1  0.445  0.251  0.662  1.0
  O  O41  1  0.445  0.749  0.838  1.0
  O  O42  1  0.489  0.766  0.502  1.0
  O  O43  1  0.489  0.234  0.998  1.0
  O  O44  1  0.511  0.234  0.498  1.0
  O  O45  1  0.511  0.766  0.002  1.0
  O  O46  1  0.015  0.768  0.992  1.0
  O  O47  1  0.015  0.232  0.508  1.0
  O  O48  1  0.985  0.232  0.008  1.0
  O  O49  1  0.985  0.768  0.492  1.0
  O  O50  1  0.341  0.694  0.681  1.0
  O  O51  1  0.341  0.306  0.819  1.0
  O  O52  1  0.659  0.306  0.319  1.0
  O  O53  1  0.659  0.694  0.181  1.0
[/CIF]
.