The compound described by TaO3 crystallizes in the hexagonal P6_3/mmc space group. Ta(1) is bonded to twelve equivalent O(1) atoms to form a mixture of face and corner-sharing TaO12 cuboctahedra. O(1) is bonded in a see-saw-like geometry to four equivalent Ta(1) atoms. is represented by the CIF file [CIF]
data_TaO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.676
_cell_length_b   4.676
_cell_length_c   3.724
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   70.510
_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
  Ta  Ta0  1  0.333  0.667  0.750  1.0
  Ta  Ta1  1  0.667  0.333  0.250  1.0
  O  O2  1  0.180  0.360  0.250  1.0
  O  O3  1  0.640  0.820  0.250  1.0
  O  O4  1  0.180  0.820  0.250  1.0
  O  O5  1  0.820  0.640  0.750  1.0
  O  O6  1  0.360  0.180  0.750  1.0
  O  O7  1  0.820  0.180  0.750  1.0
[/CIF]
.
The compound described by TaO3 crystallizes in the hexagonal P6_3/mmc space group. Ta(1) is bonded to twelve equivalent O(1) atoms to form a mixture of face and corner-sharing TaO12 cuboctahedra. O(1) is bonded in a see-saw-like geometry to four equivalent Ta(1) atoms. is represented by the CIF file [CIF]
data_TaO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.676
_cell_length_b   4.676
_cell_length_c   3.724
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   70.510
_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
  Ta  Ta0  1  0.333  0.667  0.750  1.0
  Ta  Ta1  1  0.667  0.333  0.250  1.0
  O  O2  1  0.180  0.360  0.250  1.0
  O  O3  1  0.640  0.820  0.250  1.0
  O  O4  1  0.180  0.820  0.250  1.0
  O  O5  1  0.820  0.640  0.750  1.0
  O  O6  1  0.360  0.180  0.750  1.0
  O  O7  1  0.820  0.180  0.750  1.0
[/CIF]
.