The structure described by Tm2TiO5 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Tm sites. In the first Tm site, Tm(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 TmO7 hexagonal pyramids that share corners with two equivalent Tm(2)O7 hexagonal pyramids, corners with three equivalent Ti(1)O5 trigonal bipyramids, edges with two equivalent Tm(1)O7 hexagonal pyramids, edges with three equivalent Tm(2)O7 hexagonal pyramids, and edges with two equivalent Ti(1)O5 trigonal bipyramids. In the second Tm site, Tm(2) is bonded to one O(4), one O(5), two equivalent O(3), and three equivalent O(1) atoms to form distorted TmO7 hexagonal pyramids that share corners with two equivalent Tm(1)O7 hexagonal pyramids,  a cornercorner with one Ti(1)O5 trigonal bipyramid, edges with three equivalent Tm(1)O7 hexagonal pyramids, edges with four equivalent Tm(2)O7 hexagonal pyramids, 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 Tm(2)O7 hexagonal pyramid, corners with three equivalent Tm(1)O7 hexagonal pyramids, corners with two equivalent Ti(1)O5 trigonal bipyramids, edges with two equivalent Tm(1)O7 hexagonal pyramids, and edges with two equivalent Tm(2)O7 hexagonal pyramids. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Tm(1) and three equivalent Tm(2) atoms to form OTm4 tetrahedra that share corners with two equivalent O(4)Tm2Ti2 tetrahedra, corners with two equivalent O(1)Tm4 tetrahedra, corners with five equivalent O(3)Tm3Ti tetrahedra, corners with five equivalent O(5)Tm3Ti tetrahedra,  an edgeedge with one O(4)Tm2Ti2 tetrahedra,  an edgeedge with one O(3)Tm3Ti tetrahedra, and edges with two equivalent O(1)Tm4 tetrahedra. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Tm(1) and one Ti(1) atom. In the third O site, O(3) is bonded to one Tm(1), two equivalent Tm(2), and one Ti(1) atom to form OTm3Ti tetrahedra that share  a cornercorner with one O(4)Tm2Ti2 tetrahedra,  a cornercorner with one O(5)Tm3Ti tetrahedra, corners with two equivalent O(3)Tm3Ti tetrahedra, corners with five equivalent O(1)Tm4 tetrahedra,  an edgeedge with one O(1)Tm4 tetrahedra, edges with two equivalent O(4)Tm2Ti2 tetrahedra, and edges with two equivalent O(5)Tm3Ti tetrahedra. In the fourth O site, O(4) is bonded to one Tm(1), one Tm(2), and two equivalent Ti(1) atoms to form distorted OTm2Ti2 tetrahedra that share  a cornercorner with one O(3)Tm3Ti tetrahedra,  a cornercorner with one O(5)Tm3Ti tetrahedra, corners with two equivalent O(4)Tm2Ti2 tetrahedra, corners with two equivalent O(1)Tm4 tetrahedra,  an edgeedge with one O(1)Tm4 tetrahedra, edges with two equivalent O(3)Tm3Ti tetrahedra, and edges with two equivalent O(5)Tm3Ti tetrahedra. In the fifth O site, O(5) is bonded to one Tm(2), two equivalent Tm(1), and one Ti(1) atom to form OTm3Ti tetrahedra that share  a cornercorner with one O(4)Tm2Ti2 tetrahedra,  a cornercorner with one O(3)Tm3Ti tetrahedra, corners with two equivalent O(5)Tm3Ti tetrahedra, corners with five equivalent O(1)Tm4 tetrahedra, edges with two equivalent O(4)Tm2Ti2 tetrahedra, and edges with two equivalent O(3)Tm3Ti tetrahedra. is represented by the CIF file [CIF]
data_Tm2TiO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.623
_cell_length_b   10.187
_cell_length_c   11.126
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   410.589
_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
  Tm  Tm0  1  0.250  0.120  0.275  1.0
  Tm  Tm1  1  0.250  0.135  0.943  1.0
  Tm  Tm2  1  0.750  0.365  0.443  1.0
  Tm  Tm3  1  0.750  0.380  0.775  1.0
  Tm  Tm4  1  0.250  0.620  0.225  1.0
  Tm  Tm5  1  0.250  0.635  0.557  1.0
  Tm  Tm6  1  0.750  0.865  0.057  1.0
  Tm  Tm7  1  0.750  0.880  0.725  1.0
  Ti  Ti8  1  0.250  0.170  0.617  1.0
  Ti  Ti9  1  0.750  0.330  0.117  1.0
  Ti  Ti10  1  0.250  0.670  0.883  1.0
  Ti  Ti11  1  0.750  0.830  0.383  1.0
  O  O12  1  0.750  0.005  0.894  1.0
  O  O13  1  0.250  1.000  0.653  1.0
  O  O14  1  0.250  0.226  0.454  1.0
  O  O15  1  0.750  0.237  0.614  1.0
  O  O16  1  0.750  0.248  0.270  1.0
  O  O17  1  0.250  0.252  0.770  1.0
  O  O18  1  0.250  0.263  0.114  1.0
  O  O19  1  0.750  0.274  0.954  1.0
  O  O20  1  0.750  0.500  0.153  1.0
  O  O21  1  0.250  0.495  0.394  1.0
  O  O22  1  0.750  0.505  0.606  1.0
  O  O23  1  0.250  0.500  0.847  1.0
  O  O24  1  0.250  0.726  0.046  1.0
  O  O25  1  0.750  0.737  0.886  1.0
  O  O26  1  0.750  0.748  0.230  1.0
  O  O27  1  0.250  0.752  0.730  1.0
  O  O28  1  0.250  0.763  0.386  1.0
  O  O29  1  0.750  0.774  0.546  1.0
  O  O30  1  0.750  0.000  0.347  1.0
  O  O31  1  0.250  0.995  0.106  1.0
[/CIF]
.
The structure described by Tm2TiO5 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Tm sites. In the first Tm site, Tm(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 TmO7 hexagonal pyramids that share corners with two equivalent Tm(2)O7 hexagonal pyramids, corners with three equivalent Ti(1)O5 trigonal bipyramids, edges with two equivalent Tm(1)O7 hexagonal pyramids, edges with three equivalent Tm(2)O7 hexagonal pyramids, and edges with two equivalent Ti(1)O5 trigonal bipyramids. In the second Tm site, Tm(2) is bonded to one O(4), one O(5), two equivalent O(3), and three equivalent O(1) atoms to form distorted TmO7 hexagonal pyramids that share corners with two equivalent Tm(1)O7 hexagonal pyramids,  a cornercorner with one Ti(1)O5 trigonal bipyramid, edges with three equivalent Tm(1)O7 hexagonal pyramids, edges with four equivalent Tm(2)O7 hexagonal pyramids, 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 Tm(2)O7 hexagonal pyramid, corners with three equivalent Tm(1)O7 hexagonal pyramids, corners with two equivalent Ti(1)O5 trigonal bipyramids, edges with two equivalent Tm(1)O7 hexagonal pyramids, and edges with two equivalent Tm(2)O7 hexagonal pyramids. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Tm(1) and three equivalent Tm(2) atoms to form OTm4 tetrahedra that share corners with two equivalent O(4)Tm2Ti2 tetrahedra, corners with two equivalent O(1)Tm4 tetrahedra, corners with five equivalent O(3)Tm3Ti tetrahedra, corners with five equivalent O(5)Tm3Ti tetrahedra,  an edgeedge with one O(4)Tm2Ti2 tetrahedra,  an edgeedge with one O(3)Tm3Ti tetrahedra, and edges with two equivalent O(1)Tm4 tetrahedra. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Tm(1) and one Ti(1) atom. In the third O site, O(3) is bonded to one Tm(1), two equivalent Tm(2), and one Ti(1) atom to form OTm3Ti tetrahedra that share  a cornercorner with one O(4)Tm2Ti2 tetrahedra,  a cornercorner with one O(5)Tm3Ti tetrahedra, corners with two equivalent O(3)Tm3Ti tetrahedra, corners with five equivalent O(1)Tm4 tetrahedra,  an edgeedge with one O(1)Tm4 tetrahedra, edges with two equivalent O(4)Tm2Ti2 tetrahedra, and edges with two equivalent O(5)Tm3Ti tetrahedra. In the fourth O site, O(4) is bonded to one Tm(1), one Tm(2), and two equivalent Ti(1) atoms to form distorted OTm2Ti2 tetrahedra that share  a cornercorner with one O(3)Tm3Ti tetrahedra,  a cornercorner with one O(5)Tm3Ti tetrahedra, corners with two equivalent O(4)Tm2Ti2 tetrahedra, corners with two equivalent O(1)Tm4 tetrahedra,  an edgeedge with one O(1)Tm4 tetrahedra, edges with two equivalent O(3)Tm3Ti tetrahedra, and edges with two equivalent O(5)Tm3Ti tetrahedra. In the fifth O site, O(5) is bonded to one Tm(2), two equivalent Tm(1), and one Ti(1) atom to form OTm3Ti tetrahedra that share  a cornercorner with one O(4)Tm2Ti2 tetrahedra,  a cornercorner with one O(3)Tm3Ti tetrahedra, corners with two equivalent O(5)Tm3Ti tetrahedra, corners with five equivalent O(1)Tm4 tetrahedra, edges with two equivalent O(4)Tm2Ti2 tetrahedra, and edges with two equivalent O(3)Tm3Ti tetrahedra. is represented by the CIF file [CIF]
data_Tm2TiO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.623
_cell_length_b   10.187
_cell_length_c   11.126
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   410.589
_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
  Tm  Tm0  1  0.250  0.120  0.275  1.0
  Tm  Tm1  1  0.250  0.135  0.943  1.0
  Tm  Tm2  1  0.750  0.365  0.443  1.0
  Tm  Tm3  1  0.750  0.380  0.775  1.0
  Tm  Tm4  1  0.250  0.620  0.225  1.0
  Tm  Tm5  1  0.250  0.635  0.557  1.0
  Tm  Tm6  1  0.750  0.865  0.057  1.0
  Tm  Tm7  1  0.750  0.880  0.725  1.0
  Ti  Ti8  1  0.250  0.170  0.617  1.0
  Ti  Ti9  1  0.750  0.330  0.117  1.0
  Ti  Ti10  1  0.250  0.670  0.883  1.0
  Ti  Ti11  1  0.750  0.830  0.383  1.0
  O  O12  1  0.750  0.005  0.894  1.0
  O  O13  1  0.250  1.000  0.653  1.0
  O  O14  1  0.250  0.226  0.454  1.0
  O  O15  1  0.750  0.237  0.614  1.0
  O  O16  1  0.750  0.248  0.270  1.0
  O  O17  1  0.250  0.252  0.770  1.0
  O  O18  1  0.250  0.263  0.114  1.0
  O  O19  1  0.750  0.274  0.954  1.0
  O  O20  1  0.750  0.500  0.153  1.0
  O  O21  1  0.250  0.495  0.394  1.0
  O  O22  1  0.750  0.505  0.606  1.0
  O  O23  1  0.250  0.500  0.847  1.0
  O  O24  1  0.250  0.726  0.046  1.0
  O  O25  1  0.750  0.737  0.886  1.0
  O  O26  1  0.750  0.748  0.230  1.0
  O  O27  1  0.250  0.752  0.730  1.0
  O  O28  1  0.250  0.763  0.386  1.0
  O  O29  1  0.750  0.774  0.546  1.0
  O  O30  1  0.750  0.000  0.347  1.0
  O  O31  1  0.250  0.995  0.106  1.0
[/CIF]
.