The structure described by Ho2O3 crystallizes in the monoclinic C2/m space group. There are three inequivalent Ho sites. In the first Ho site, Ho(1) is bonded to one O(1), one O(3), two equivalent O(2), and two equivalent O(5) atoms to form a mixture of distorted edge and corner-sharing HoO6 octahedra. The corner-sharing octahedra are not tilted. In the second Ho site, Ho(2) is bonded in a 7-coordinate geometry to one O(2), one O(4), two equivalent O(3), and three equivalent O(1) atoms. In the third Ho site, Ho(3) is bonded in a 7-coordinate geometry to two equivalent O(3), two equivalent O(5), and three equivalent O(4) atoms. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Ho(1) and three equivalent Ho(2) atoms to form OHo4 tetrahedra that share  a cornercorner with one O(2)Ho6 octahedra, corners with five equivalent O(3)Ho5 square pyramids, corners with two equivalent O(1)Ho4 tetrahedra, corners with two equivalent O(5)Ho4 tetrahedra, edges with two equivalent O(2)Ho6 octahedra,  an edgeedge with one O(3)Ho5 square pyramid, and edges with two equivalent O(1)Ho4 tetrahedra. The corner-sharing octahedral tilt angles are 49°. In the second O site, O(2) is bonded to two equivalent Ho(2) and four equivalent Ho(1) atoms to form OHo6 octahedra that share corners with two equivalent O(1)Ho4 tetrahedra, corners with four equivalent O(5)Ho4 tetrahedra, edges with two equivalent O(2)Ho6 octahedra, edges with four equivalent O(3)Ho5 square pyramids, edges with two equivalent O(5)Ho4 tetrahedra, and edges with four equivalent O(1)Ho4 tetrahedra. In the third O site, O(3) is bonded to one Ho(1), two equivalent Ho(2), and two equivalent Ho(3) atoms to form distorted OHo5 square pyramids that share corners with two equivalent O(5)Ho4 tetrahedra, corners with five equivalent O(1)Ho4 tetrahedra, edges with two equivalent O(2)Ho6 octahedra, edges with two equivalent O(3)Ho5 square pyramids,  an edgeedge with one O(1)Ho4 tetrahedra, and edges with two equivalent O(5)Ho4 tetrahedra. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ho(2) and three equivalent Ho(3) atoms. In the fifth O site, O(5) is bonded to two equivalent Ho(1) and two equivalent Ho(3) atoms to form OHo4 tetrahedra that share corners with two equivalent O(2)Ho6 octahedra, corners with two equivalent O(3)Ho5 square pyramids, corners with two equivalent O(1)Ho4 tetrahedra, corners with two equivalent O(5)Ho4 tetrahedra,  an edgeedge with one O(2)Ho6 octahedra, edges with two equivalent O(3)Ho5 square pyramids, and  an edgeedge with one O(5)Ho4 tetrahedra. The corner-sharing octahedral tilt angles are 14°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ho2O3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.459
_cell_length_b   7.139
_cell_length_c   8.540
_cell_angle_alpha   99.861
_cell_angle_beta   90.001
_cell_angle_gamma   104.020
_symmetry_Int_Tables_number   1
_cell_volume   201.392
_cell_formula_units_Z   3
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
  Ho  Ho0  1  0.033  0.066  0.813  1.0
  Ho  Ho1  1  0.691  0.382  0.137  1.0
  Ho  Ho2  1  0.365  0.730  0.512  1.0
  Ho  Ho3  1  0.309  0.618  0.863  1.0
  Ho  Ho4  1  0.635  0.270  0.488  1.0
  Ho  Ho5  1  0.967  0.934  0.187  1.0
  O  O6  1  0.175  0.349  0.970  1.0
  O  O7  1  0.500  0.000  0.000  1.0
  O  O8  1  0.825  0.651  0.030  1.0
  O  O9  1  0.872  0.745  0.718  1.0
  O  O10  1  0.206  0.412  0.624  1.0
  O  O11  1  0.794  0.588  0.376  1.0
  O  O12  1  0.128  0.255  0.282  1.0
  O  O13  1  0.529  0.058  0.656  1.0
  O  O14  1  0.471  0.942  0.344  1.0
[/CIF]
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The structure described by Ho2O3 crystallizes in the monoclinic C2/m space group. There are three inequivalent Ho sites. In the first Ho site, Ho(1) is bonded to one O(1), one O(3), two equivalent O(2), and two equivalent O(5) atoms to form a mixture of distorted edge and corner-sharing HoO6 octahedra. The corner-sharing octahedra are not tilted. In the second Ho site, Ho(2) is bonded in a 7-coordinate geometry to one O(2), one O(4), two equivalent O(3), and three equivalent O(1) atoms. In the third Ho site, Ho(3) is bonded in a 7-coordinate geometry to two equivalent O(3), two equivalent O(5), and three equivalent O(4) atoms. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Ho(1) and three equivalent Ho(2) atoms to form OHo4 tetrahedra that share  a cornercorner with one O(2)Ho6 octahedra, corners with five equivalent O(3)Ho5 square pyramids, corners with two equivalent O(1)Ho4 tetrahedra, corners with two equivalent O(5)Ho4 tetrahedra, edges with two equivalent O(2)Ho6 octahedra,  an edgeedge with one O(3)Ho5 square pyramid, and edges with two equivalent O(1)Ho4 tetrahedra. The corner-sharing octahedral tilt angles are 49°. In the second O site, O(2) is bonded to two equivalent Ho(2) and four equivalent Ho(1) atoms to form OHo6 octahedra that share corners with two equivalent O(1)Ho4 tetrahedra, corners with four equivalent O(5)Ho4 tetrahedra, edges with two equivalent O(2)Ho6 octahedra, edges with four equivalent O(3)Ho5 square pyramids, edges with two equivalent O(5)Ho4 tetrahedra, and edges with four equivalent O(1)Ho4 tetrahedra. In the third O site, O(3) is bonded to one Ho(1), two equivalent Ho(2), and two equivalent Ho(3) atoms to form distorted OHo5 square pyramids that share corners with two equivalent O(5)Ho4 tetrahedra, corners with five equivalent O(1)Ho4 tetrahedra, edges with two equivalent O(2)Ho6 octahedra, edges with two equivalent O(3)Ho5 square pyramids,  an edgeedge with one O(1)Ho4 tetrahedra, and edges with two equivalent O(5)Ho4 tetrahedra. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ho(2) and three equivalent Ho(3) atoms. In the fifth O site, O(5) is bonded to two equivalent Ho(1) and two equivalent Ho(3) atoms to form OHo4 tetrahedra that share corners with two equivalent O(2)Ho6 octahedra, corners with two equivalent O(3)Ho5 square pyramids, corners with two equivalent O(1)Ho4 tetrahedra, corners with two equivalent O(5)Ho4 tetrahedra,  an edgeedge with one O(2)Ho6 octahedra, edges with two equivalent O(3)Ho5 square pyramids, and  an edgeedge with one O(5)Ho4 tetrahedra. The corner-sharing octahedral tilt angles are 14°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ho2O3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.459
_cell_length_b   7.139
_cell_length_c   8.540
_cell_angle_alpha   99.861
_cell_angle_beta   90.001
_cell_angle_gamma   104.020
_symmetry_Int_Tables_number   1
_cell_volume   201.392
_cell_formula_units_Z   3
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
  Ho  Ho0  1  0.033  0.066  0.813  1.0
  Ho  Ho1  1  0.691  0.382  0.137  1.0
  Ho  Ho2  1  0.365  0.730  0.512  1.0
  Ho  Ho3  1  0.309  0.618  0.863  1.0
  Ho  Ho4  1  0.635  0.270  0.488  1.0
  Ho  Ho5  1  0.967  0.934  0.187  1.0
  O  O6  1  0.175  0.349  0.970  1.0
  O  O7  1  0.500  0.000  0.000  1.0
  O  O8  1  0.825  0.651  0.030  1.0
  O  O9  1  0.872  0.745  0.718  1.0
  O  O10  1  0.206  0.412  0.624  1.0
  O  O11  1  0.794  0.588  0.376  1.0
  O  O12  1  0.128  0.255  0.282  1.0
  O  O13  1  0.529  0.058  0.656  1.0
  O  O14  1  0.471  0.942  0.344  1.0
[/CIF]
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