The crystal structure described by Ho2TiO5 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded to one O(1), one O(3), one O(4), two equivalent O(2), and two equivalent O(5) atoms to form distorted HoO7 pentagonal bipyramids that share corners with two equivalent Ho(2)O7 hexagonal pyramids, corners with three equivalent Ti(1)O5 trigonal bipyramids, edges with three equivalent Ho(2)O7 hexagonal pyramids, edges with two equivalent Ho(1)O7 pentagonal bipyramids, and edges with two equivalent Ti(1)O5 trigonal bipyramids. In the second Ho site, Ho(2) is bonded to one O(4), one O(5), two equivalent O(3), and three equivalent O(1) atoms to form distorted HoO7 hexagonal pyramids that share corners with two equivalent Ho(1)O7 pentagonal bipyramids,  a cornercorner with one Ti(1)O5 trigonal bipyramid, edges with four equivalent Ho(2)O7 hexagonal pyramids, edges with three equivalent Ho(1)O7 pentagonal bipyramids, and edges with two equivalent Ti(1)O5 trigonal bipyramids. Ti(1) is bonded to one O(2), one O(3), one O(5), and two equivalent O(4) atoms to form distorted TiO5 trigonal bipyramids that share  a cornercorner with one Ho(2)O7 hexagonal pyramid, corners with three equivalent Ho(1)O7 pentagonal bipyramids, corners with two equivalent Ti(1)O5 trigonal bipyramids, edges with two equivalent Ho(2)O7 hexagonal pyramids, and edges with two equivalent Ho(1)O7 pentagonal bipyramids. 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 corners with two equivalent O(4)Ho2Ti2 tetrahedra, corners with two equivalent O(1)Ho4 tetrahedra, corners with five equivalent O(3)Ho3Ti tetrahedra, corners with five equivalent O(5)Ho3Ti tetrahedra,  an edgeedge with one O(4)Ho2Ti2 tetrahedra,  an edgeedge with one O(3)Ho3Ti tetrahedra, and edges with two equivalent O(1)Ho4 tetrahedra. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Ho(1) and one Ti(1) atom. In the third O site, O(3) is bonded to one Ho(1), two equivalent Ho(2), and one Ti(1) atom to form OHo3Ti tetrahedra that share  a cornercorner with one O(4)Ho2Ti2 tetrahedra,  a cornercorner with one O(5)Ho3Ti tetrahedra, corners with two equivalent O(3)Ho3Ti tetrahedra, corners with five equivalent O(1)Ho4 tetrahedra,  an edgeedge with one O(1)Ho4 tetrahedra, edges with two equivalent O(4)Ho2Ti2 tetrahedra, and edges with two equivalent O(5)Ho3Ti tetrahedra. In the fourth O site, O(4) is bonded to one Ho(1), one Ho(2), and two equivalent Ti(1) atoms to form distorted OHo2Ti2 tetrahedra that share  a cornercorner with one O(3)Ho3Ti tetrahedra,  a cornercorner with one O(5)Ho3Ti tetrahedra, corners with two equivalent O(4)Ho2Ti2 tetrahedra, corners with two equivalent O(1)Ho4 tetrahedra,  an edgeedge with one O(1)Ho4 tetrahedra, edges with two equivalent O(3)Ho3Ti tetrahedra, and edges with two equivalent O(5)Ho3Ti tetrahedra. In the fifth O site, O(5) is bonded to one Ho(2), two equivalent Ho(1), and one Ti(1) atom to form OHo3Ti tetrahedra that share  a cornercorner with one O(4)Ho2Ti2 tetrahedra,  a cornercorner with one O(3)Ho3Ti tetrahedra, corners with two equivalent O(5)Ho3Ti tetrahedra, corners with five equivalent O(1)Ho4 tetrahedra, edges with two equivalent O(4)Ho2Ti2 tetrahedra, and edges with two equivalent O(3)Ho3Ti tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ho2TiO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.663
_cell_length_b   10.287
_cell_length_c   11.202
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   422.160
_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  0.250  0.118  0.276  1.0
  Ho  Ho1  1  0.250  0.136  0.944  1.0
  Ho  Ho2  1  0.750  0.364  0.444  1.0
  Ho  Ho3  1  0.750  0.382  0.776  1.0
  Ho  Ho4  1  0.250  0.618  0.224  1.0
  Ho  Ho5  1  0.250  0.636  0.556  1.0
  Ho  Ho6  1  0.750  0.864  0.056  1.0
  Ho  Ho7  1  0.750  0.882  0.724  1.0
  Ti  Ti8  1  0.250  0.172  0.618  1.0
  Ti  Ti9  1  0.750  0.328  0.118  1.0
  Ti  Ti10  1  0.250  0.672  0.882  1.0
  Ti  Ti11  1  0.750  0.828  0.382  1.0
  O  O12  1  0.750  0.005  0.895  1.0
  O  O13  1  0.250  0.003  0.653  1.0
  O  O14  1  0.250  0.225  0.456  1.0
  O  O15  1  0.750  0.236  0.616  1.0
  O  O16  1  0.750  0.246  0.270  1.0
  O  O17  1  0.250  0.254  0.770  1.0
  O  O18  1  0.250  0.264  0.116  1.0
  O  O19  1  0.750  0.275  0.956  1.0
  O  O20  1  0.750  0.497  0.153  1.0
  O  O21  1  0.250  0.495  0.395  1.0
  O  O22  1  0.750  0.505  0.605  1.0
  O  O23  1  0.250  0.503  0.847  1.0
  O  O24  1  0.250  0.725  0.044  1.0
  O  O25  1  0.750  0.736  0.884  1.0
  O  O26  1  0.750  0.746  0.230  1.0
  O  O27  1  0.250  0.754  0.730  1.0
  O  O28  1  0.250  0.764  0.384  1.0
  O  O29  1  0.750  0.775  0.544  1.0
  O  O30  1  0.750  0.997  0.347  1.0
  O  O31  1  0.250  0.995  0.105  1.0
[/CIF]
.
The crystal structure described by Ho2TiO5 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded to one O(1), one O(3), one O(4), two equivalent O(2), and two equivalent O(5) atoms to form distorted HoO7 pentagonal bipyramids that share corners with two equivalent Ho(2)O7 hexagonal pyramids, corners with three equivalent Ti(1)O5 trigonal bipyramids, edges with three equivalent Ho(2)O7 hexagonal pyramids, edges with two equivalent Ho(1)O7 pentagonal bipyramids, and edges with two equivalent Ti(1)O5 trigonal bipyramids. In the second Ho site, Ho(2) is bonded to one O(4), one O(5), two equivalent O(3), and three equivalent O(1) atoms to form distorted HoO7 hexagonal pyramids that share corners with two equivalent Ho(1)O7 pentagonal bipyramids,  a cornercorner with one Ti(1)O5 trigonal bipyramid, edges with four equivalent Ho(2)O7 hexagonal pyramids, edges with three equivalent Ho(1)O7 pentagonal bipyramids, and edges with two equivalent Ti(1)O5 trigonal bipyramids. Ti(1) is bonded to one O(2), one O(3), one O(5), and two equivalent O(4) atoms to form distorted TiO5 trigonal bipyramids that share  a cornercorner with one Ho(2)O7 hexagonal pyramid, corners with three equivalent Ho(1)O7 pentagonal bipyramids, corners with two equivalent Ti(1)O5 trigonal bipyramids, edges with two equivalent Ho(2)O7 hexagonal pyramids, and edges with two equivalent Ho(1)O7 pentagonal bipyramids. 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 corners with two equivalent O(4)Ho2Ti2 tetrahedra, corners with two equivalent O(1)Ho4 tetrahedra, corners with five equivalent O(3)Ho3Ti tetrahedra, corners with five equivalent O(5)Ho3Ti tetrahedra,  an edgeedge with one O(4)Ho2Ti2 tetrahedra,  an edgeedge with one O(3)Ho3Ti tetrahedra, and edges with two equivalent O(1)Ho4 tetrahedra. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Ho(1) and one Ti(1) atom. In the third O site, O(3) is bonded to one Ho(1), two equivalent Ho(2), and one Ti(1) atom to form OHo3Ti tetrahedra that share  a cornercorner with one O(4)Ho2Ti2 tetrahedra,  a cornercorner with one O(5)Ho3Ti tetrahedra, corners with two equivalent O(3)Ho3Ti tetrahedra, corners with five equivalent O(1)Ho4 tetrahedra,  an edgeedge with one O(1)Ho4 tetrahedra, edges with two equivalent O(4)Ho2Ti2 tetrahedra, and edges with two equivalent O(5)Ho3Ti tetrahedra. In the fourth O site, O(4) is bonded to one Ho(1), one Ho(2), and two equivalent Ti(1) atoms to form distorted OHo2Ti2 tetrahedra that share  a cornercorner with one O(3)Ho3Ti tetrahedra,  a cornercorner with one O(5)Ho3Ti tetrahedra, corners with two equivalent O(4)Ho2Ti2 tetrahedra, corners with two equivalent O(1)Ho4 tetrahedra,  an edgeedge with one O(1)Ho4 tetrahedra, edges with two equivalent O(3)Ho3Ti tetrahedra, and edges with two equivalent O(5)Ho3Ti tetrahedra. In the fifth O site, O(5) is bonded to one Ho(2), two equivalent Ho(1), and one Ti(1) atom to form OHo3Ti tetrahedra that share  a cornercorner with one O(4)Ho2Ti2 tetrahedra,  a cornercorner with one O(3)Ho3Ti tetrahedra, corners with two equivalent O(5)Ho3Ti tetrahedra, corners with five equivalent O(1)Ho4 tetrahedra, edges with two equivalent O(4)Ho2Ti2 tetrahedra, and edges with two equivalent O(3)Ho3Ti tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ho2TiO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.663
_cell_length_b   10.287
_cell_length_c   11.202
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   422.160
_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  0.250  0.118  0.276  1.0
  Ho  Ho1  1  0.250  0.136  0.944  1.0
  Ho  Ho2  1  0.750  0.364  0.444  1.0
  Ho  Ho3  1  0.750  0.382  0.776  1.0
  Ho  Ho4  1  0.250  0.618  0.224  1.0
  Ho  Ho5  1  0.250  0.636  0.556  1.0
  Ho  Ho6  1  0.750  0.864  0.056  1.0
  Ho  Ho7  1  0.750  0.882  0.724  1.0
  Ti  Ti8  1  0.250  0.172  0.618  1.0
  Ti  Ti9  1  0.750  0.328  0.118  1.0
  Ti  Ti10  1  0.250  0.672  0.882  1.0
  Ti  Ti11  1  0.750  0.828  0.382  1.0
  O  O12  1  0.750  0.005  0.895  1.0
  O  O13  1  0.250  0.003  0.653  1.0
  O  O14  1  0.250  0.225  0.456  1.0
  O  O15  1  0.750  0.236  0.616  1.0
  O  O16  1  0.750  0.246  0.270  1.0
  O  O17  1  0.250  0.254  0.770  1.0
  O  O18  1  0.250  0.264  0.116  1.0
  O  O19  1  0.750  0.275  0.956  1.0
  O  O20  1  0.750  0.497  0.153  1.0
  O  O21  1  0.250  0.495  0.395  1.0
  O  O22  1  0.750  0.505  0.605  1.0
  O  O23  1  0.250  0.503  0.847  1.0
  O  O24  1  0.250  0.725  0.044  1.0
  O  O25  1  0.750  0.736  0.884  1.0
  O  O26  1  0.750  0.746  0.230  1.0
  O  O27  1  0.250  0.754  0.730  1.0
  O  O28  1  0.250  0.764  0.384  1.0
  O  O29  1  0.750  0.775  0.544  1.0
  O  O30  1  0.750  0.997  0.347  1.0
  O  O31  1  0.250  0.995  0.105  1.0
[/CIF]
.