The structure described by Tm2V2O7 crystallizes in the cubic Fd-3m space group. Tm(1) is bonded in a distorted body-centered cubic geometry to two equivalent O(1) and six equivalent O(2) atoms. V(1) is bonded to six equivalent O(2) atoms to form corner-sharing VO6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Tm(1) atoms to form OTm4 tetrahedra that share corners with four equivalent O(1)Tm4 tetrahedra, corners with twelve equivalent O(2)Tm2V2 tetrahedra, and edges with six equivalent O(2)Tm2V2 tetrahedra. In the second O site, O(2) is bonded to two equivalent Tm(1) and two equivalent V(1) atoms to form distorted OTm2V2 tetrahedra that share corners with two equivalent O(1)Tm4 tetrahedra, corners with twelve equivalent O(2)Tm2V2 tetrahedra,  an edgeedge with one O(1)Tm4 tetrahedra, and edges with four equivalent O(2)Tm2V2 tetrahedra. is represented by the CIF file [CIF]
data_Tm2V2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.007
_cell_length_b   7.007
_cell_length_c   7.007
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   243.246
_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  0.625  0.625  0.625  1.0
  Tm  Tm1  1  0.125  0.625  0.625  1.0
  Tm  Tm2  1  0.625  0.625  0.125  1.0
  Tm  Tm3  1  0.625  0.125  0.625  1.0
  V  V4  1  0.125  0.125  0.125  1.0
  V  V5  1  0.625  0.125  0.125  1.0
  V  V6  1  0.125  0.125  0.625  1.0
  V  V7  1  0.125  0.625  0.125  1.0
  O  O8  1  0.750  0.750  0.750  1.0
  O  O9  1  0.500  0.500  0.500  1.0
  O  O10  1  0.792  0.208  0.208  1.0
  O  O11  1  0.042  0.458  0.458  1.0
  O  O12  1  0.208  0.208  0.792  1.0
  O  O13  1  0.792  0.208  0.792  1.0
  O  O14  1  0.208  0.792  0.208  1.0
  O  O15  1  0.792  0.792  0.208  1.0
  O  O16  1  0.208  0.792  0.792  1.0
  O  O17  1  0.042  0.042  0.458  1.0
  O  O18  1  0.458  0.458  0.042  1.0
  O  O19  1  0.042  0.458  0.042  1.0
  O  O20  1  0.458  0.042  0.458  1.0
  O  O21  1  0.458  0.042  0.042  1.0
[/CIF]
.
The structure described by Tm2V2O7 crystallizes in the cubic Fd-3m space group. Tm(1) is bonded in a distorted body-centered cubic geometry to two equivalent O(1) and six equivalent O(2) atoms. V(1) is bonded to six equivalent O(2) atoms to form corner-sharing VO6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Tm(1) atoms to form OTm4 tetrahedra that share corners with four equivalent O(1)Tm4 tetrahedra, corners with twelve equivalent O(2)Tm2V2 tetrahedra, and edges with six equivalent O(2)Tm2V2 tetrahedra. In the second O site, O(2) is bonded to two equivalent Tm(1) and two equivalent V(1) atoms to form distorted OTm2V2 tetrahedra that share corners with two equivalent O(1)Tm4 tetrahedra, corners with twelve equivalent O(2)Tm2V2 tetrahedra,  an edgeedge with one O(1)Tm4 tetrahedra, and edges with four equivalent O(2)Tm2V2 tetrahedra. is represented by the CIF file [CIF]
data_Tm2V2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.007
_cell_length_b   7.007
_cell_length_c   7.007
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   243.246
_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  0.625  0.625  0.625  1.0
  Tm  Tm1  1  0.125  0.625  0.625  1.0
  Tm  Tm2  1  0.625  0.625  0.125  1.0
  Tm  Tm3  1  0.625  0.125  0.625  1.0
  V  V4  1  0.125  0.125  0.125  1.0
  V  V5  1  0.625  0.125  0.125  1.0
  V  V6  1  0.125  0.125  0.625  1.0
  V  V7  1  0.125  0.625  0.125  1.0
  O  O8  1  0.750  0.750  0.750  1.0
  O  O9  1  0.500  0.500  0.500  1.0
  O  O10  1  0.792  0.208  0.208  1.0
  O  O11  1  0.042  0.458  0.458  1.0
  O  O12  1  0.208  0.208  0.792  1.0
  O  O13  1  0.792  0.208  0.792  1.0
  O  O14  1  0.208  0.792  0.208  1.0
  O  O15  1  0.792  0.792  0.208  1.0
  O  O16  1  0.208  0.792  0.792  1.0
  O  O17  1  0.042  0.042  0.458  1.0
  O  O18  1  0.458  0.458  0.042  1.0
  O  O19  1  0.042  0.458  0.042  1.0
  O  O20  1  0.458  0.042  0.458  1.0
  O  O21  1  0.458  0.042  0.042  1.0
[/CIF]
.