The compound described by YCoO3 crystallizes in the hexagonal P6_3cm space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded to one O(1), three equivalent O(3), and three equivalent O(4) atoms to form distorted YO7 pentagonal bipyramids that share corners with three equivalent Co(1)O5 trigonal bipyramids, edges with three equivalent Y(1)O7 pentagonal bipyramids, edges with three equivalent Y(2)O7 pentagonal bipyramids, and edges with three equivalent Co(1)O5 trigonal bipyramids. In the second Y site, Y(2) is bonded to one O(2), three equivalent O(3), and three equivalent O(4) atoms to form distorted YO7 pentagonal bipyramids that share corners with three equivalent Co(1)O5 trigonal bipyramids, edges with six equivalent Y(1)O7 pentagonal bipyramids, and edges with three equivalent Co(1)O5 trigonal bipyramids. Co(1) is bonded to one O(2), one O(3), one O(4), and two equivalent O(1) atoms to form CoO5 trigonal bipyramids that share  a cornercorner with one Y(2)O7 pentagonal bipyramid, corners with two equivalent Y(1)O7 pentagonal bipyramids, corners with six equivalent Co(1)O5 trigonal bipyramids,  an edgeedge with one Y(2)O7 pentagonal bipyramid, and edges with two equivalent Y(1)O7 pentagonal bipyramids. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Y(1) and three equivalent Co(1) atoms to form OYCo3 trigonal pyramids that share corners with six equivalent O(3)Y3Co tetrahedra, corners with three equivalent O(1)YCo3 trigonal pyramids, corners with three equivalent O(2)YCo3 trigonal pyramids, and edges with three equivalent O(4)Y3Co tetrahedra. In the second O site, O(2) is bonded to one Y(2) and three equivalent Co(1) atoms to form OYCo3 trigonal pyramids that share corners with six equivalent O(4)Y3Co tetrahedra, corners with six equivalent O(1)YCo3 trigonal pyramids, and edges with three equivalent O(3)Y3Co tetrahedra. In the third O site, O(3) is bonded to one Y(2), two equivalent Y(1), and one Co(1) atom to form distorted OY3Co tetrahedra that share corners with four equivalent O(4)Y3Co tetrahedra, corners with six equivalent O(3)Y3Co tetrahedra, corners with four equivalent O(1)YCo3 trigonal pyramids, edges with three equivalent O(4)Y3Co tetrahedra, and  an edgeedge with one O(2)YCo3 trigonal pyramid. In the fourth O site, O(4) is bonded to one Y(2), two equivalent Y(1), and one Co(1) atom to form OY3Co tetrahedra that share corners with four equivalent O(3)Y3Co tetrahedra, corners with six equivalent O(4)Y3Co tetrahedra, corners with two equivalent O(2)YCo3 trigonal pyramids, edges with three equivalent O(3)Y3Co tetrahedra, and edges with two equivalent O(1)YCo3 trigonal pyramids. is represented by the CIF card [CIF]
data_YCoO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.166
_cell_length_b   6.166
_cell_length_c   11.428
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   376.258
_cell_formula_units_Z   6
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
  Y  Y0  1  0.667  0.333  0.230  1.0
  Y  Y1  1  0.333  0.667  0.730  1.0
  Y  Y2  1  0.667  0.333  0.730  1.0
  Y  Y3  1  0.333  0.667  0.230  1.0
  Y  Y4  1  0.000  0.000  0.776  1.0
  Y  Y5  1  0.000  0.000  0.276  1.0
  Co  Co6  1  0.666  0.000  0.500  1.0
  Co  Co7  1  0.666  0.666  1.000  1.0
  Co  Co8  1  0.000  0.334  1.000  1.0
  Co  Co9  1  0.000  0.666  0.500  1.0
  Co  Co10  1  0.334  0.334  0.500  1.0
  Co  Co11  1  0.334  0.000  1.000  1.0
  O  O12  1  0.667  0.333  0.022  1.0
  O  O13  1  0.333  0.667  0.522  1.0
  O  O14  1  0.667  0.333  0.522  1.0
  O  O15  1  0.333  0.667  0.022  1.0
  O  O16  1  0.000  0.000  0.982  1.0
  O  O17  1  0.000  0.000  0.482  1.0
  O  O18  1  0.359  0.000  0.840  1.0
  O  O19  1  0.359  0.359  0.340  1.0
  O  O20  1  0.000  0.641  0.340  1.0
  O  O21  1  0.000  0.359  0.840  1.0
  O  O22  1  0.641  0.641  0.840  1.0
  O  O23  1  0.641  0.000  0.340  1.0
  O  O24  1  0.308  0.000  0.165  1.0
  O  O25  1  0.308  0.308  0.665  1.0
  O  O26  1  0.000  0.692  0.665  1.0
  O  O27  1  0.000  0.308  0.165  1.0
  O  O28  1  0.692  0.692  0.165  1.0
  O  O29  1  0.692  0.000  0.665  1.0
[/CIF]
.
The compound described by YCoO3 crystallizes in the hexagonal P6_3cm space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded to one O(1), three equivalent O(3), and three equivalent O(4) atoms to form distorted YO7 pentagonal bipyramids that share corners with three equivalent Co(1)O5 trigonal bipyramids, edges with three equivalent Y(1)O7 pentagonal bipyramids, edges with three equivalent Y(2)O7 pentagonal bipyramids, and edges with three equivalent Co(1)O5 trigonal bipyramids. In the second Y site, Y(2) is bonded to one O(2), three equivalent O(3), and three equivalent O(4) atoms to form distorted YO7 pentagonal bipyramids that share corners with three equivalent Co(1)O5 trigonal bipyramids, edges with six equivalent Y(1)O7 pentagonal bipyramids, and edges with three equivalent Co(1)O5 trigonal bipyramids. Co(1) is bonded to one O(2), one O(3), one O(4), and two equivalent O(1) atoms to form CoO5 trigonal bipyramids that share  a cornercorner with one Y(2)O7 pentagonal bipyramid, corners with two equivalent Y(1)O7 pentagonal bipyramids, corners with six equivalent Co(1)O5 trigonal bipyramids,  an edgeedge with one Y(2)O7 pentagonal bipyramid, and edges with two equivalent Y(1)O7 pentagonal bipyramids. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Y(1) and three equivalent Co(1) atoms to form OYCo3 trigonal pyramids that share corners with six equivalent O(3)Y3Co tetrahedra, corners with three equivalent O(1)YCo3 trigonal pyramids, corners with three equivalent O(2)YCo3 trigonal pyramids, and edges with three equivalent O(4)Y3Co tetrahedra. In the second O site, O(2) is bonded to one Y(2) and three equivalent Co(1) atoms to form OYCo3 trigonal pyramids that share corners with six equivalent O(4)Y3Co tetrahedra, corners with six equivalent O(1)YCo3 trigonal pyramids, and edges with three equivalent O(3)Y3Co tetrahedra. In the third O site, O(3) is bonded to one Y(2), two equivalent Y(1), and one Co(1) atom to form distorted OY3Co tetrahedra that share corners with four equivalent O(4)Y3Co tetrahedra, corners with six equivalent O(3)Y3Co tetrahedra, corners with four equivalent O(1)YCo3 trigonal pyramids, edges with three equivalent O(4)Y3Co tetrahedra, and  an edgeedge with one O(2)YCo3 trigonal pyramid. In the fourth O site, O(4) is bonded to one Y(2), two equivalent Y(1), and one Co(1) atom to form OY3Co tetrahedra that share corners with four equivalent O(3)Y3Co tetrahedra, corners with six equivalent O(4)Y3Co tetrahedra, corners with two equivalent O(2)YCo3 trigonal pyramids, edges with three equivalent O(3)Y3Co tetrahedra, and edges with two equivalent O(1)YCo3 trigonal pyramids. is represented by the CIF card [CIF]
data_YCoO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.166
_cell_length_b   6.166
_cell_length_c   11.428
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   376.258
_cell_formula_units_Z   6
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
  Y  Y0  1  0.667  0.333  0.230  1.0
  Y  Y1  1  0.333  0.667  0.730  1.0
  Y  Y2  1  0.667  0.333  0.730  1.0
  Y  Y3  1  0.333  0.667  0.230  1.0
  Y  Y4  1  0.000  0.000  0.776  1.0
  Y  Y5  1  0.000  0.000  0.276  1.0
  Co  Co6  1  0.666  0.000  0.500  1.0
  Co  Co7  1  0.666  0.666  1.000  1.0
  Co  Co8  1  0.000  0.334  1.000  1.0
  Co  Co9  1  0.000  0.666  0.500  1.0
  Co  Co10  1  0.334  0.334  0.500  1.0
  Co  Co11  1  0.334  0.000  1.000  1.0
  O  O12  1  0.667  0.333  0.022  1.0
  O  O13  1  0.333  0.667  0.522  1.0
  O  O14  1  0.667  0.333  0.522  1.0
  O  O15  1  0.333  0.667  0.022  1.0
  O  O16  1  0.000  0.000  0.982  1.0
  O  O17  1  0.000  0.000  0.482  1.0
  O  O18  1  0.359  0.000  0.840  1.0
  O  O19  1  0.359  0.359  0.340  1.0
  O  O20  1  0.000  0.641  0.340  1.0
  O  O21  1  0.000  0.359  0.840  1.0
  O  O22  1  0.641  0.641  0.840  1.0
  O  O23  1  0.641  0.000  0.340  1.0
  O  O24  1  0.308  0.000  0.165  1.0
  O  O25  1  0.308  0.308  0.665  1.0
  O  O26  1  0.000  0.692  0.665  1.0
  O  O27  1  0.000  0.308  0.165  1.0
  O  O28  1  0.692  0.692  0.165  1.0
  O  O29  1  0.692  0.000  0.665  1.0
[/CIF]
.