The crystal structure described by Y2BaCoO5 crystallizes in the orthorhombic Pnma space group. Ba(1) is bonded in a 11-coordinate geometry to three equivalent O(3), four equivalent O(1), and four equivalent O(2) atoms. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 7-coordinate geometry to one O(3), two equivalent O(1), and four equivalent O(2) atoms. In the second Y site, Y(2) is bonded to one O(3), two equivalent O(2), and four equivalent O(1) atoms to form distorted YO7 pentagonal bipyramids that share corners with five equivalent Co(1)O5 trigonal bipyramids, edges with two equivalent Y(2)O7 pentagonal bipyramids, and  an edgeedge with one Co(1)O5 trigonal bipyramid. Co(1) is bonded to one O(3), two equivalent O(1), and two equivalent O(2) atoms to form distorted CoO5 trigonal bipyramids that share corners with five equivalent Y(2)O7 pentagonal bipyramids and  an edgeedge with one Y(2)O7 pentagonal bipyramid. There are three inequivalent O sites. In the first O site, O(3) is bonded to three equivalent Ba(1), one Y(1), one Y(2), and one Co(1) atom to form distorted OBa3Y2Co octahedra that share corners with two equivalent O(3)Ba3Y2Co octahedra, corners with eight equivalent O(2)Ba2Y3Co octahedra, edges with two equivalent O(3)Ba3Y2Co octahedra, and faces with four equivalent O(2)Ba2Y3Co octahedra. The corner-sharing octahedral tilt angles range from 1-64°. In the second O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Ba(1), one Y(1), two equivalent Y(2), and one Co(1) atom. In the third O site, O(2) is bonded to two equivalent Ba(1), one Y(2), two equivalent Y(1), and one Co(1) atom to form distorted OBa2Y3Co octahedra that share corners with four equivalent O(2)Ba2Y3Co octahedra, corners with four equivalent O(3)Ba3Y2Co octahedra, edges with two equivalent O(2)Ba2Y3Co octahedra, faces with two equivalent O(2)Ba2Y3Co octahedra, and faces with two equivalent O(3)Ba3Y2Co octahedra. The corner-sharing octahedral tilt angles range from 25-78°. is represented by the CIF card [CIF]
data_BaY2CoO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.770
_cell_length_b   7.159
_cell_length_c   12.391
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   511.790
_cell_formula_units_Z   4
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  0.250  0.921  0.900  1.0
  Ba  Ba1  1  0.750  0.079  0.100  1.0
  Ba  Ba2  1  0.750  0.421  0.600  1.0
  Ba  Ba3  1  0.250  0.579  0.400  1.0
  Y  Y4  1  0.250  0.119  0.292  1.0
  Y  Y5  1  0.750  0.881  0.708  1.0
  Y  Y6  1  0.750  0.619  0.208  1.0
  Y  Y7  1  0.250  0.381  0.792  1.0
  Y  Y8  1  0.250  0.401  0.075  1.0
  Y  Y9  1  0.750  0.599  0.925  1.0
  Y  Y10  1  0.750  0.901  0.425  1.0
  Y  Y11  1  0.250  0.099  0.575  1.0
  Co  Co12  1  0.250  0.692  0.652  1.0
  Co  Co13  1  0.750  0.308  0.348  1.0
  Co  Co14  1  0.750  0.192  0.848  1.0
  Co  Co15  1  0.250  0.808  0.152  1.0
  O  O16  1  0.995  0.167  0.434  1.0
  O  O17  1  0.495  0.833  0.566  1.0
  O  O18  1  0.005  0.667  0.066  1.0
  O  O19  1  0.505  0.333  0.934  1.0
  O  O20  1  0.005  0.833  0.566  1.0
  O  O21  1  0.505  0.167  0.434  1.0
  O  O22  1  0.995  0.333  0.934  1.0
  O  O23  1  0.495  0.667  0.066  1.0
  O  O24  1  0.502  0.359  0.225  1.0
  O  O25  1  0.002  0.641  0.775  1.0
  O  O26  1  0.498  0.859  0.275  1.0
  O  O27  1  0.998  0.141  0.725  1.0
  O  O28  1  0.498  0.641  0.775  1.0
  O  O29  1  0.998  0.359  0.225  1.0
  O  O30  1  0.502  0.141  0.725  1.0
  O  O31  1  0.002  0.859  0.275  1.0
  O  O32  1  0.250  0.075  0.102  1.0
  O  O33  1  0.750  0.925  0.898  1.0
  O  O34  1  0.750  0.575  0.398  1.0
  O  O35  1  0.250  0.425  0.602  1.0
[/CIF]
.
The crystal structure described by Y2BaCoO5 crystallizes in the orthorhombic Pnma space group. Ba(1) is bonded in a 11-coordinate geometry to three equivalent O(3), four equivalent O(1), and four equivalent O(2) atoms. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 7-coordinate geometry to one O(3), two equivalent O(1), and four equivalent O(2) atoms. In the second Y site, Y(2) is bonded to one O(3), two equivalent O(2), and four equivalent O(1) atoms to form distorted YO7 pentagonal bipyramids that share corners with five equivalent Co(1)O5 trigonal bipyramids, edges with two equivalent Y(2)O7 pentagonal bipyramids, and  an edgeedge with one Co(1)O5 trigonal bipyramid. Co(1) is bonded to one O(3), two equivalent O(1), and two equivalent O(2) atoms to form distorted CoO5 trigonal bipyramids that share corners with five equivalent Y(2)O7 pentagonal bipyramids and  an edgeedge with one Y(2)O7 pentagonal bipyramid. There are three inequivalent O sites. In the first O site, O(3) is bonded to three equivalent Ba(1), one Y(1), one Y(2), and one Co(1) atom to form distorted OBa3Y2Co octahedra that share corners with two equivalent O(3)Ba3Y2Co octahedra, corners with eight equivalent O(2)Ba2Y3Co octahedra, edges with two equivalent O(3)Ba3Y2Co octahedra, and faces with four equivalent O(2)Ba2Y3Co octahedra. The corner-sharing octahedral tilt angles range from 1-64°. In the second O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Ba(1), one Y(1), two equivalent Y(2), and one Co(1) atom. In the third O site, O(2) is bonded to two equivalent Ba(1), one Y(2), two equivalent Y(1), and one Co(1) atom to form distorted OBa2Y3Co octahedra that share corners with four equivalent O(2)Ba2Y3Co octahedra, corners with four equivalent O(3)Ba3Y2Co octahedra, edges with two equivalent O(2)Ba2Y3Co octahedra, faces with two equivalent O(2)Ba2Y3Co octahedra, and faces with two equivalent O(3)Ba3Y2Co octahedra. The corner-sharing octahedral tilt angles range from 25-78°. is represented by the CIF card [CIF]
data_BaY2CoO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.770
_cell_length_b   7.159
_cell_length_c   12.391
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   511.790
_cell_formula_units_Z   4
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  0.250  0.921  0.900  1.0
  Ba  Ba1  1  0.750  0.079  0.100  1.0
  Ba  Ba2  1  0.750  0.421  0.600  1.0
  Ba  Ba3  1  0.250  0.579  0.400  1.0
  Y  Y4  1  0.250  0.119  0.292  1.0
  Y  Y5  1  0.750  0.881  0.708  1.0
  Y  Y6  1  0.750  0.619  0.208  1.0
  Y  Y7  1  0.250  0.381  0.792  1.0
  Y  Y8  1  0.250  0.401  0.075  1.0
  Y  Y9  1  0.750  0.599  0.925  1.0
  Y  Y10  1  0.750  0.901  0.425  1.0
  Y  Y11  1  0.250  0.099  0.575  1.0
  Co  Co12  1  0.250  0.692  0.652  1.0
  Co  Co13  1  0.750  0.308  0.348  1.0
  Co  Co14  1  0.750  0.192  0.848  1.0
  Co  Co15  1  0.250  0.808  0.152  1.0
  O  O16  1  0.995  0.167  0.434  1.0
  O  O17  1  0.495  0.833  0.566  1.0
  O  O18  1  0.005  0.667  0.066  1.0
  O  O19  1  0.505  0.333  0.934  1.0
  O  O20  1  0.005  0.833  0.566  1.0
  O  O21  1  0.505  0.167  0.434  1.0
  O  O22  1  0.995  0.333  0.934  1.0
  O  O23  1  0.495  0.667  0.066  1.0
  O  O24  1  0.502  0.359  0.225  1.0
  O  O25  1  0.002  0.641  0.775  1.0
  O  O26  1  0.498  0.859  0.275  1.0
  O  O27  1  0.998  0.141  0.725  1.0
  O  O28  1  0.498  0.641  0.775  1.0
  O  O29  1  0.998  0.359  0.225  1.0
  O  O30  1  0.502  0.141  0.725  1.0
  O  O31  1  0.002  0.859  0.275  1.0
  O  O32  1  0.250  0.075  0.102  1.0
  O  O33  1  0.750  0.925  0.898  1.0
  O  O34  1  0.750  0.575  0.398  1.0
  O  O35  1  0.250  0.425  0.602  1.0
[/CIF]
.