The structure described by Ho2Se3 crystallizes in the orthorhombic Fddd space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded to two equivalent Se(2) and four equivalent Se(1) atoms to form a mixture of corner and edge-sharing HoSe6 octahedra. The corner-sharing octahedral tilt angles range from 3-5°. In the second Ho site, Ho(2) is bonded to two equivalent Se(2) and four equivalent Se(1) atoms to form a mixture of corner and edge-sharing HoSe6 octahedra. The corner-sharing octahedral tilt angles are 5°. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a rectangular see-saw-like geometry to two equivalent Ho(1) and two equivalent Ho(2) atoms. In the second Se site, Se(2) is bonded in a rectangular see-saw-like geometry to two equivalent Ho(1) and two equivalent Ho(2) atoms. is represented by the CIF file [CIF]
data_Ho2Se3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.032
_cell_length_b   7.032
_cell_length_c   12.840
_cell_angle_alpha   100.647
_cell_angle_beta   100.647
_cell_angle_gamma   108.985
_symmetry_Int_Tables_number   1
_cell_volume   569.232
_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
  Ho  Ho0  1  0.378  0.128  0.256  1.0
  Ho  Ho1  1  0.872  0.622  0.244  1.0
  Ho  Ho2  1  0.622  0.872  0.744  1.0
  Ho  Ho3  1  0.128  0.378  0.756  1.0
  Ho  Ho4  1  0.041  0.791  0.582  1.0
  Ho  Ho5  1  0.209  0.959  0.918  1.0
  Ho  Ho6  1  0.959  0.209  0.418  1.0
  Ho  Ho7  1  0.791  0.041  0.082  1.0
  Se  Se8  1  0.539  0.283  0.088  1.0
  Se  Se9  1  0.195  0.951  0.412  1.0
  Se  Se10  1  0.717  0.461  0.412  1.0
  Se  Se11  1  0.049  0.805  0.088  1.0
  Se  Se12  1  0.461  0.717  0.912  1.0
  Se  Se13  1  0.805  0.049  0.588  1.0
  Se  Se14  1  0.283  0.539  0.588  1.0
  Se  Se15  1  0.951  0.195  0.912  1.0
  Se  Se16  1  0.634  0.884  0.250  1.0
  Se  Se17  1  0.116  0.366  0.250  1.0
  Se  Se18  1  0.366  0.116  0.750  1.0
  Se  Se19  1  0.884  0.634  0.750  1.0
[/CIF]
.
The structure described by Ho2Se3 crystallizes in the orthorhombic Fddd space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded to two equivalent Se(2) and four equivalent Se(1) atoms to form a mixture of corner and edge-sharing HoSe6 octahedra. The corner-sharing octahedral tilt angles range from 3-5°. In the second Ho site, Ho(2) is bonded to two equivalent Se(2) and four equivalent Se(1) atoms to form a mixture of corner and edge-sharing HoSe6 octahedra. The corner-sharing octahedral tilt angles are 5°. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a rectangular see-saw-like geometry to two equivalent Ho(1) and two equivalent Ho(2) atoms. In the second Se site, Se(2) is bonded in a rectangular see-saw-like geometry to two equivalent Ho(1) and two equivalent Ho(2) atoms. is represented by the CIF file [CIF]
data_Ho2Se3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.032
_cell_length_b   7.032
_cell_length_c   12.840
_cell_angle_alpha   100.647
_cell_angle_beta   100.647
_cell_angle_gamma   108.985
_symmetry_Int_Tables_number   1
_cell_volume   569.232
_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
  Ho  Ho0  1  0.378  0.128  0.256  1.0
  Ho  Ho1  1  0.872  0.622  0.244  1.0
  Ho  Ho2  1  0.622  0.872  0.744  1.0
  Ho  Ho3  1  0.128  0.378  0.756  1.0
  Ho  Ho4  1  0.041  0.791  0.582  1.0
  Ho  Ho5  1  0.209  0.959  0.918  1.0
  Ho  Ho6  1  0.959  0.209  0.418  1.0
  Ho  Ho7  1  0.791  0.041  0.082  1.0
  Se  Se8  1  0.539  0.283  0.088  1.0
  Se  Se9  1  0.195  0.951  0.412  1.0
  Se  Se10  1  0.717  0.461  0.412  1.0
  Se  Se11  1  0.049  0.805  0.088  1.0
  Se  Se12  1  0.461  0.717  0.912  1.0
  Se  Se13  1  0.805  0.049  0.588  1.0
  Se  Se14  1  0.283  0.539  0.588  1.0
  Se  Se15  1  0.951  0.195  0.912  1.0
  Se  Se16  1  0.634  0.884  0.250  1.0
  Se  Se17  1  0.116  0.366  0.250  1.0
  Se  Se18  1  0.366  0.116  0.750  1.0
  Se  Se19  1  0.884  0.634  0.750  1.0
[/CIF]
.