The crystal structure described by Ta2Te2O9 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(1), one O(10), one O(3), one O(5), one O(6), and one O(9) atom to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 0-33°. In the second Ta site, Ta(2) is bonded to one O(2), one O(4), one O(5), one O(7), one O(8), and one O(9) atom to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 0-33°. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a distorted T-shaped geometry to one O(10), one O(6), and one O(8) atom. In the second Te site, Te(2) is bonded in a distorted T-shaped geometry to one O(1), one O(2), and one O(4) atom. There are ten inequivalent O sites. In the first O site, O(6) is bonded in a bent 150 degrees geometry to one Ta(1) and one Te(1) atom. In the second O site, O(7) is bonded in a linear geometry to two equivalent Ta(2) atoms. In the third O site, O(8) is bonded in a bent 150 degrees geometry to one Ta(2) and one Te(1) atom. In the fourth O site, O(9) is bonded in a bent 150 degrees geometry to one Ta(1) and one Ta(2) atom. In the fifth O site, O(10) is bonded in a bent 120 degrees geometry to one Ta(1) and one Te(1) atom. In the sixth O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Ta(1) and one Te(2) atom. In the seventh O site, O(2) is bonded in a bent 150 degrees geometry to one Ta(2) and one Te(2) atom. In the eighth O site, O(3) is bonded in a linear geometry to two equivalent Ta(1) atoms. In the ninth O site, O(4) is bonded in a bent 150 degrees geometry to one Ta(2) and one Te(2) atom. In the tenth O site, O(5) is bonded in a bent 150 degrees geometry to one Ta(1) and one Ta(2) atom. is represented by the CIF file [CIF]
data_Ta2Te2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.544
_cell_length_b   7.146
_cell_length_c   14.733
_cell_angle_alpha   77.228
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   774.577
_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
  Ta  Ta0  1  0.504  0.367  0.901  1.0
  Ta  Ta1  1  0.004  0.633  0.599  1.0
  Ta  Ta2  1  0.496  0.633  0.099  1.0
  Ta  Ta3  1  0.996  0.367  0.401  1.0
  Ta  Ta4  1  0.701  0.055  0.567  1.0
  Ta  Ta5  1  0.201  0.945  0.933  1.0
  Ta  Ta6  1  0.299  0.945  0.433  1.0
  Ta  Ta7  1  0.799  0.055  0.067  1.0
  Te  Te8  1  0.561  0.463  0.666  1.0
  Te  Te9  1  0.061  0.537  0.834  1.0
  Te  Te10  1  0.439  0.537  0.334  1.0
  Te  Te11  1  0.939  0.463  0.166  1.0
  Te  Te12  1  0.637  0.872  0.816  1.0
  Te  Te13  1  0.137  0.128  0.684  1.0
  Te  Te14  1  0.363  0.128  0.184  1.0
  Te  Te15  1  0.863  0.872  0.316  1.0
  O  O16  1  0.843  0.602  0.332  1.0
  O  O17  1  0.343  0.398  0.168  1.0
  O  O18  1  0.157  0.398  0.668  1.0
  O  O19  1  0.657  0.602  0.832  1.0
  O  O20  1  0.902  0.116  0.647  1.0
  O  O21  1  0.402  0.884  0.853  1.0
  O  O22  1  0.098  0.884  0.353  1.0
  O  O23  1  0.598  0.116  0.147  1.0
  O  O24  1  0.500  0.500  0.000  1.0
  O  O25  1  0.000  0.500  0.500  1.0
  O  O26  1  0.591  0.905  0.689  1.0
  O  O27  1  0.091  0.095  0.811  1.0
  O  O28  1  0.409  0.095  0.311  1.0
  O  O29  1  0.909  0.905  0.189  1.0
  O  O30  1  0.698  0.210  0.956  1.0
  O  O31  1  0.198  0.790  0.544  1.0
  O  O32  1  0.302  0.790  0.044  1.0
  O  O33  1  0.802  0.210  0.456  1.0
  O  O34  1  0.306  0.518  0.829  1.0
  O  O35  1  0.806  0.482  0.671  1.0
  O  O36  1  0.000  0.000  0.000  1.0
  O  O37  1  0.500  0.000  0.500  1.0
  O  O38  1  0.937  0.286  0.090  1.0
  O  O39  1  0.437  0.714  0.410  1.0
  O  O40  1  0.063  0.714  0.910  1.0
  O  O41  1  0.563  0.286  0.590  1.0
  O  O42  1  0.669  0.827  0.052  1.0
  O  O43  1  0.169  0.173  0.448  1.0
  O  O44  1  0.331  0.173  0.948  1.0
  O  O45  1  0.831  0.827  0.552  1.0
  O  O46  1  0.953  0.277  0.279  1.0
  O  O47  1  0.453  0.723  0.221  1.0
  O  O48  1  0.047  0.723  0.721  1.0
  O  O49  1  0.547  0.277  0.779  1.0
  O  O50  1  0.194  0.518  0.329  1.0
  O  O51  1  0.694  0.482  0.171  1.0
[/CIF]
.
The crystal structure described by Ta2Te2O9 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(1), one O(10), one O(3), one O(5), one O(6), and one O(9) atom to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 0-33°. In the second Ta site, Ta(2) is bonded to one O(2), one O(4), one O(5), one O(7), one O(8), and one O(9) atom to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 0-33°. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a distorted T-shaped geometry to one O(10), one O(6), and one O(8) atom. In the second Te site, Te(2) is bonded in a distorted T-shaped geometry to one O(1), one O(2), and one O(4) atom. There are ten inequivalent O sites. In the first O site, O(6) is bonded in a bent 150 degrees geometry to one Ta(1) and one Te(1) atom. In the second O site, O(7) is bonded in a linear geometry to two equivalent Ta(2) atoms. In the third O site, O(8) is bonded in a bent 150 degrees geometry to one Ta(2) and one Te(1) atom. In the fourth O site, O(9) is bonded in a bent 150 degrees geometry to one Ta(1) and one Ta(2) atom. In the fifth O site, O(10) is bonded in a bent 120 degrees geometry to one Ta(1) and one Te(1) atom. In the sixth O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Ta(1) and one Te(2) atom. In the seventh O site, O(2) is bonded in a bent 150 degrees geometry to one Ta(2) and one Te(2) atom. In the eighth O site, O(3) is bonded in a linear geometry to two equivalent Ta(1) atoms. In the ninth O site, O(4) is bonded in a bent 150 degrees geometry to one Ta(2) and one Te(2) atom. In the tenth O site, O(5) is bonded in a bent 150 degrees geometry to one Ta(1) and one Ta(2) atom. is represented by the CIF file [CIF]
data_Ta2Te2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.544
_cell_length_b   7.146
_cell_length_c   14.733
_cell_angle_alpha   77.228
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   774.577
_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
  Ta  Ta0  1  0.504  0.367  0.901  1.0
  Ta  Ta1  1  0.004  0.633  0.599  1.0
  Ta  Ta2  1  0.496  0.633  0.099  1.0
  Ta  Ta3  1  0.996  0.367  0.401  1.0
  Ta  Ta4  1  0.701  0.055  0.567  1.0
  Ta  Ta5  1  0.201  0.945  0.933  1.0
  Ta  Ta6  1  0.299  0.945  0.433  1.0
  Ta  Ta7  1  0.799  0.055  0.067  1.0
  Te  Te8  1  0.561  0.463  0.666  1.0
  Te  Te9  1  0.061  0.537  0.834  1.0
  Te  Te10  1  0.439  0.537  0.334  1.0
  Te  Te11  1  0.939  0.463  0.166  1.0
  Te  Te12  1  0.637  0.872  0.816  1.0
  Te  Te13  1  0.137  0.128  0.684  1.0
  Te  Te14  1  0.363  0.128  0.184  1.0
  Te  Te15  1  0.863  0.872  0.316  1.0
  O  O16  1  0.843  0.602  0.332  1.0
  O  O17  1  0.343  0.398  0.168  1.0
  O  O18  1  0.157  0.398  0.668  1.0
  O  O19  1  0.657  0.602  0.832  1.0
  O  O20  1  0.902  0.116  0.647  1.0
  O  O21  1  0.402  0.884  0.853  1.0
  O  O22  1  0.098  0.884  0.353  1.0
  O  O23  1  0.598  0.116  0.147  1.0
  O  O24  1  0.500  0.500  0.000  1.0
  O  O25  1  0.000  0.500  0.500  1.0
  O  O26  1  0.591  0.905  0.689  1.0
  O  O27  1  0.091  0.095  0.811  1.0
  O  O28  1  0.409  0.095  0.311  1.0
  O  O29  1  0.909  0.905  0.189  1.0
  O  O30  1  0.698  0.210  0.956  1.0
  O  O31  1  0.198  0.790  0.544  1.0
  O  O32  1  0.302  0.790  0.044  1.0
  O  O33  1  0.802  0.210  0.456  1.0
  O  O34  1  0.306  0.518  0.829  1.0
  O  O35  1  0.806  0.482  0.671  1.0
  O  O36  1  0.000  0.000  0.000  1.0
  O  O37  1  0.500  0.000  0.500  1.0
  O  O38  1  0.937  0.286  0.090  1.0
  O  O39  1  0.437  0.714  0.410  1.0
  O  O40  1  0.063  0.714  0.910  1.0
  O  O41  1  0.563  0.286  0.590  1.0
  O  O42  1  0.669  0.827  0.052  1.0
  O  O43  1  0.169  0.173  0.448  1.0
  O  O44  1  0.331  0.173  0.948  1.0
  O  O45  1  0.831  0.827  0.552  1.0
  O  O46  1  0.953  0.277  0.279  1.0
  O  O47  1  0.453  0.723  0.221  1.0
  O  O48  1  0.047  0.723  0.721  1.0
  O  O49  1  0.547  0.277  0.779  1.0
  O  O50  1  0.194  0.518  0.329  1.0
  O  O51  1  0.694  0.482  0.171  1.0
[/CIF]
.