The compound described by Tm2GeO5 crystallizes in the monoclinic C2/c space group. Tm(1) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(2), and three equivalent O(1) atoms. Ge(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing GeO6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to three equivalent Tm(1) and one Ge(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Tm(1) and one Ge(1) atom. In the third O site, O(3) is bonded to two equivalent Tm(1) and two equivalent Ge(1) atoms to form distorted corner-sharing OTm2Ge2 trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Tm2GeO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.329
_cell_length_b   6.329
_cell_length_c   7.373
_cell_angle_alpha   68.009
_cell_angle_beta   68.009
_cell_angle_gamma   48.178
_symmetry_Int_Tables_number   1
_cell_volume   200.738
_cell_formula_units_Z   2
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  0.370  0.344  0.266  1.0
  Tm  Tm1  1  0.344  0.370  0.766  1.0
  Tm  Tm2  1  0.656  0.630  0.234  1.0
  Tm  Tm3  1  0.630  0.656  0.734  1.0
  Ge  Ge4  1  0.000  0.000  0.000  1.0
  Ge  Ge5  1  0.000  0.000  0.500  1.0
  O  O6  1  0.235  0.612  0.466  1.0
  O  O7  1  0.612  0.235  0.966  1.0
  O  O8  1  0.985  0.681  0.134  1.0
  O  O9  1  0.319  0.015  0.366  1.0
  O  O10  1  0.681  0.985  0.634  1.0
  O  O11  1  0.015  0.319  0.866  1.0
  O  O12  1  0.388  0.765  0.034  1.0
  O  O13  1  0.835  0.165  0.250  1.0
  O  O14  1  0.765  0.388  0.534  1.0
  O  O15  1  0.165  0.835  0.750  1.0
[/CIF]
.
The compound described by Tm2GeO5 crystallizes in the monoclinic C2/c space group. Tm(1) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(2), and three equivalent O(1) atoms. Ge(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing GeO6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to three equivalent Tm(1) and one Ge(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Tm(1) and one Ge(1) atom. In the third O site, O(3) is bonded to two equivalent Tm(1) and two equivalent Ge(1) atoms to form distorted corner-sharing OTm2Ge2 trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Tm2GeO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.329
_cell_length_b   6.329
_cell_length_c   7.373
_cell_angle_alpha   68.009
_cell_angle_beta   68.009
_cell_angle_gamma   48.178
_symmetry_Int_Tables_number   1
_cell_volume   200.738
_cell_formula_units_Z   2
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  0.370  0.344  0.266  1.0
  Tm  Tm1  1  0.344  0.370  0.766  1.0
  Tm  Tm2  1  0.656  0.630  0.234  1.0
  Tm  Tm3  1  0.630  0.656  0.734  1.0
  Ge  Ge4  1  0.000  0.000  0.000  1.0
  Ge  Ge5  1  0.000  0.000  0.500  1.0
  O  O6  1  0.235  0.612  0.466  1.0
  O  O7  1  0.612  0.235  0.966  1.0
  O  O8  1  0.985  0.681  0.134  1.0
  O  O9  1  0.319  0.015  0.366  1.0
  O  O10  1  0.681  0.985  0.634  1.0
  O  O11  1  0.015  0.319  0.866  1.0
  O  O12  1  0.388  0.765  0.034  1.0
  O  O13  1  0.835  0.165  0.250  1.0
  O  O14  1  0.765  0.388  0.534  1.0
  O  O15  1  0.165  0.835  0.750  1.0
[/CIF]
.