The structure described by Ba6Y2Co4O15 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 Co(2)O4 tetrahedra and corners with four equivalent Co(1)O4 tetrahedra. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(2), one O(3), one O(6), and one O(7) atom to form CoO4 tetrahedra that share corners with four equivalent Y(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 5-34°. In the second Co site, Co(2) is bonded to one O(1), one O(4), one O(5), and one O(8) atom to form CoO4 tetrahedra that share corners with two equivalent Y(1)O6 octahedra and  a cornercorner with one Co(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 5-32°. There are eight inequivalent O sites. In the first O site, O(4) is bonded in a 5-coordinate geometry to one Ba(1), one Ba(2), one Ba(4), one Y(1), and one Co(2) atom. In the second O site, O(5) is bonded to one Ba(1), one Ba(2), one Ba(3), one Ba(4), one Y(1), and one Co(2) atom to form a mixture of distorted corner and edge-sharing OBa4YCo octahedra. The corner-sharing octahedral tilt angles range from 5-63°. 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 Co(1) atom. In the fourth O site, O(7) is bonded to two equivalent Ba(3), two equivalent Ba(4), one Y(1), and one Co(1) atom to form a mixture of distorted corner and edge-sharing OBa4YCo octahedra. The corner-sharing octahedral tilt angles range from 5-12°. 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 Co(2) atom. In the sixth O site, O(1) is bonded in a 2-coordinate geometry to two equivalent Ba(1), two equivalent Ba(3), and two equivalent Co(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 Co(1) atom. In the eighth O site, O(3) is bonded in a 2-coordinate geometry to one Ba(2), three equivalent Ba(4), one Y(1), and one Co(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ba6Y2Co4O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.992
_cell_length_b   7.989
_cell_length_c   18.370
_cell_angle_alpha   88.885
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   879.218
_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  0.287  0.000  0.250  1.0
  Ba  Ba1  1  0.713  0.000  0.750  1.0
  Ba  Ba2  1  0.327  0.500  0.250  1.0
  Ba  Ba3  1  0.673  0.500  0.750  1.0
  Ba  Ba4  1  0.750  0.980  0.088  1.0
  Ba  Ba5  1  0.750  0.020  0.412  1.0
  Ba  Ba6  1  0.250  0.020  0.912  1.0
  Ba  Ba7  1  0.250  0.980  0.588  1.0
  Ba  Ba8  1  0.247  0.496  0.578  1.0
  Ba  Ba9  1  0.247  0.504  0.922  1.0
  Ba  Ba10  1  0.753  0.504  0.422  1.0
  Ba  Ba11  1  0.753  0.496  0.078  1.0
  Y  Y12  1  0.253  0.754  0.411  1.0
  Y  Y13  1  0.253  0.246  0.089  1.0
  Y  Y14  1  0.747  0.246  0.589  1.0
  Y  Y15  1  0.747  0.754  0.911  1.0
  Co  Co16  1  0.253  0.753  0.063  1.0
  Co  Co17  1  0.253  0.247  0.437  1.0
  Co  Co18  1  0.747  0.247  0.937  1.0
  Co  Co19  1  0.747  0.753  0.563  1.0
  Co  Co20  1  0.776  0.769  0.264  1.0
  Co  Co21  1  0.776  0.231  0.236  1.0
  Co  Co22  1  0.224  0.231  0.736  1.0
  Co  Co23  1  0.224  0.769  0.764  1.0
  O  O24  1  0.820  0.000  0.250  1.0
  O  O25  1  0.180  0.000  0.750  1.0
  O  O26  1  0.768  0.957  0.606  1.0
  O  O27  1  0.768  0.043  0.894  1.0
  O  O28  1  0.232  0.043  0.394  1.0
  O  O29  1  0.232  0.957  0.106  1.0
  O  O30  1  0.247  0.532  0.089  1.0
  O  O31  1  0.247  0.468  0.411  1.0
  O  O32  1  0.753  0.468  0.911  1.0
  O  O33  1  0.753  0.532  0.589  1.0
  O  O34  1  0.033  0.716  0.312  1.0
  O  O35  1  0.033  0.284  0.188  1.0
  O  O36  1  0.967  0.284  0.688  1.0
  O  O37  1  0.967  0.716  0.812  1.0
  O  O38  1  0.542  0.755  0.335  1.0
  O  O39  1  0.542  0.245  0.165  1.0
  O  O40  1  0.458  0.245  0.665  1.0
  O  O41  1  0.458  0.755  0.835  1.0
  O  O42  1  0.493  0.765  0.502  1.0
  O  O43  1  0.493  0.235  0.998  1.0
  O  O44  1  0.507  0.235  0.498  1.0
  O  O45  1  0.507  0.765  0.002  1.0
  O  O46  1  0.013  0.764  0.994  1.0
  O  O47  1  0.013  0.236  0.506  1.0
  O  O48  1  0.987  0.236  0.006  1.0
  O  O49  1  0.987  0.764  0.494  1.0
  O  O50  1  0.352  0.700  0.682  1.0
  O  O51  1  0.352  0.300  0.818  1.0
  O  O52  1  0.648  0.300  0.318  1.0
  O  O53  1  0.648  0.700  0.182  1.0
[/CIF]
.
The structure described by Ba6Y2Co4O15 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 Co(2)O4 tetrahedra and corners with four equivalent Co(1)O4 tetrahedra. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(2), one O(3), one O(6), and one O(7) atom to form CoO4 tetrahedra that share corners with four equivalent Y(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 5-34°. In the second Co site, Co(2) is bonded to one O(1), one O(4), one O(5), and one O(8) atom to form CoO4 tetrahedra that share corners with two equivalent Y(1)O6 octahedra and  a cornercorner with one Co(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 5-32°. There are eight inequivalent O sites. In the first O site, O(4) is bonded in a 5-coordinate geometry to one Ba(1), one Ba(2), one Ba(4), one Y(1), and one Co(2) atom. In the second O site, O(5) is bonded to one Ba(1), one Ba(2), one Ba(3), one Ba(4), one Y(1), and one Co(2) atom to form a mixture of distorted corner and edge-sharing OBa4YCo octahedra. The corner-sharing octahedral tilt angles range from 5-63°. 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 Co(1) atom. In the fourth O site, O(7) is bonded to two equivalent Ba(3), two equivalent Ba(4), one Y(1), and one Co(1) atom to form a mixture of distorted corner and edge-sharing OBa4YCo octahedra. The corner-sharing octahedral tilt angles range from 5-12°. 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 Co(2) atom. In the sixth O site, O(1) is bonded in a 2-coordinate geometry to two equivalent Ba(1), two equivalent Ba(3), and two equivalent Co(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 Co(1) atom. In the eighth O site, O(3) is bonded in a 2-coordinate geometry to one Ba(2), three equivalent Ba(4), one Y(1), and one Co(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ba6Y2Co4O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.992
_cell_length_b   7.989
_cell_length_c   18.370
_cell_angle_alpha   88.885
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   879.218
_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  0.287  0.000  0.250  1.0
  Ba  Ba1  1  0.713  0.000  0.750  1.0
  Ba  Ba2  1  0.327  0.500  0.250  1.0
  Ba  Ba3  1  0.673  0.500  0.750  1.0
  Ba  Ba4  1  0.750  0.980  0.088  1.0
  Ba  Ba5  1  0.750  0.020  0.412  1.0
  Ba  Ba6  1  0.250  0.020  0.912  1.0
  Ba  Ba7  1  0.250  0.980  0.588  1.0
  Ba  Ba8  1  0.247  0.496  0.578  1.0
  Ba  Ba9  1  0.247  0.504  0.922  1.0
  Ba  Ba10  1  0.753  0.504  0.422  1.0
  Ba  Ba11  1  0.753  0.496  0.078  1.0
  Y  Y12  1  0.253  0.754  0.411  1.0
  Y  Y13  1  0.253  0.246  0.089  1.0
  Y  Y14  1  0.747  0.246  0.589  1.0
  Y  Y15  1  0.747  0.754  0.911  1.0
  Co  Co16  1  0.253  0.753  0.063  1.0
  Co  Co17  1  0.253  0.247  0.437  1.0
  Co  Co18  1  0.747  0.247  0.937  1.0
  Co  Co19  1  0.747  0.753  0.563  1.0
  Co  Co20  1  0.776  0.769  0.264  1.0
  Co  Co21  1  0.776  0.231  0.236  1.0
  Co  Co22  1  0.224  0.231  0.736  1.0
  Co  Co23  1  0.224  0.769  0.764  1.0
  O  O24  1  0.820  0.000  0.250  1.0
  O  O25  1  0.180  0.000  0.750  1.0
  O  O26  1  0.768  0.957  0.606  1.0
  O  O27  1  0.768  0.043  0.894  1.0
  O  O28  1  0.232  0.043  0.394  1.0
  O  O29  1  0.232  0.957  0.106  1.0
  O  O30  1  0.247  0.532  0.089  1.0
  O  O31  1  0.247  0.468  0.411  1.0
  O  O32  1  0.753  0.468  0.911  1.0
  O  O33  1  0.753  0.532  0.589  1.0
  O  O34  1  0.033  0.716  0.312  1.0
  O  O35  1  0.033  0.284  0.188  1.0
  O  O36  1  0.967  0.284  0.688  1.0
  O  O37  1  0.967  0.716  0.812  1.0
  O  O38  1  0.542  0.755  0.335  1.0
  O  O39  1  0.542  0.245  0.165  1.0
  O  O40  1  0.458  0.245  0.665  1.0
  O  O41  1  0.458  0.755  0.835  1.0
  O  O42  1  0.493  0.765  0.502  1.0
  O  O43  1  0.493  0.235  0.998  1.0
  O  O44  1  0.507  0.235  0.498  1.0
  O  O45  1  0.507  0.765  0.002  1.0
  O  O46  1  0.013  0.764  0.994  1.0
  O  O47  1  0.013  0.236  0.506  1.0
  O  O48  1  0.987  0.236  0.006  1.0
  O  O49  1  0.987  0.764  0.494  1.0
  O  O50  1  0.352  0.700  0.682  1.0
  O  O51  1  0.352  0.300  0.818  1.0
  O  O52  1  0.648  0.300  0.318  1.0
  O  O53  1  0.648  0.700  0.182  1.0
[/CIF]
.