The material structure described by Ta11O2 crystallizes in the triclinic P1 space group. There are twenty-two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a single-bond geometry to one O(4) atom. In the second Ta site, Ta(2) is bonded in a 4-coordinate geometry to one Ta(10), one Ta(16), one Ta(21), and one Ta(3) atom. In the third Ta site, Ta(3) is bonded in a 1-coordinate geometry to one Ta(2), one Ta(6), and one O(4) atom. In the fourth Ta site, Ta(4) is bonded in a 5-coordinate geometry to one Ta(10), one Ta(14), one Ta(15), one Ta(5), and one O(1) atom. In the fifth Ta site, Ta(5) is bonded in a 2-coordinate geometry to one Ta(4) and one Ta(8) atom. In the sixth Ta site, Ta(6) is bonded in a 5-coordinate geometry to one Ta(11), one Ta(16), one Ta(17), one Ta(3), and one O(2) atom. In the seventh Ta site, Ta(7) is bonded in a 5-coordinate geometry to one Ta(10), one Ta(15), one Ta(17), one Ta(21), and one O(1) atom. In the eighth Ta site, Ta(8) is bonded in a distorted single-bond geometry to one Ta(5), one Ta(9), and one O(4) atom. In the ninth Ta site, Ta(9) is bonded in a 5-coordinate geometry to one Ta(18), one Ta(19), one Ta(20), one Ta(8), and one O(2) atom. In the tenth Ta site, Ta(10) is bonded in a 4-coordinate geometry to one Ta(19), one Ta(2), one Ta(4), and one Ta(7) atom. In the eleventh Ta site, Ta(11) is bonded in a distorted water-like geometry to one Ta(6), one O(2), and one O(3) atom. In the twelfth Ta site, Ta(12) is bonded in a distorted single-bond geometry to one O(1) and one O(3) atom. In the thirteenth Ta site, Ta(13) is bonded in a distorted single-bond geometry to one O(3) atom. In the fourteenth Ta site, Ta(14) is bonded in a distorted single-bond geometry to one Ta(4), one O(1), and one O(3) atom. In the fifteenth Ta site, Ta(15) is bonded in a 5-coordinate geometry to one Ta(18), one Ta(20), one Ta(4), one Ta(7), and one O(1) atom. In the sixteenth Ta site, Ta(16) is bonded in a 5-coordinate geometry to one Ta(18), one Ta(19), one Ta(2), one Ta(6), and one O(2) atom. In the seventeenth Ta site, Ta(17) is bonded in a 2-coordinate geometry to one Ta(6) and one Ta(7) atom. In the eighteenth Ta site, Ta(18) is bonded in a 2-coordinate geometry to one Ta(15), one Ta(16), and one Ta(9) atom. In the nineteenth Ta site, Ta(19) is bonded in a distorted single-bond geometry to one Ta(10), one Ta(16), one Ta(9), and one O(2) atom. In the twentieth Ta site, Ta(20) is bonded in a distorted single-bond geometry to one Ta(15), one Ta(9), and one O(1) atom. In the twenty-first Ta site, Ta(21) is bonded in a distorted single-bond geometry to one Ta(2), one Ta(7), and one O(1) atom. In the twenty-second Ta site, Ta(22) is bonded in a single-bond geometry to one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted pentagonal bipyramidal geometry to one Ta(12), one Ta(14), one Ta(15), one Ta(20), one Ta(21), one Ta(4), and one Ta(7) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Ta(11), one Ta(16), one Ta(19), one Ta(6), and one Ta(9) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ta(11), one Ta(12), one Ta(13), and one Ta(14) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Ta(1), one Ta(22), one Ta(3), and one Ta(8) atom. is represented by the CIF file [CIF]
data_Ta11O2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.493
_cell_length_b   7.524
_cell_length_c   9.309
_cell_angle_alpha   110.003
_cell_angle_beta   107.355
_cell_angle_gamma   101.793
_symmetry_Int_Tables_number   1
_cell_volume   442.388
_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  0.622  0.978  0.648  1.0
  Ta  Ta1  1  0.023  0.214  0.421  1.0
  Ta  Ta2  1  0.336  0.199  0.606  1.0
  Ta  Ta3  1  0.331  0.202  0.109  1.0
  Ta  Ta4  1  0.437  0.452  0.277  1.0
  Ta  Ta5  1  0.441  0.458  0.761  1.0
  Ta  Ta6  1  0.594  0.955  0.101  1.0
  Ta  Ta7  1  0.504  0.708  0.444  1.0
  Ta  Ta8  1  0.849  0.741  0.601  1.0
  Ta  Ta9  1  0.682  0.202  0.279  1.0
  Ta  Ta10  1  0.734  0.435  0.918  1.0
  Ta  Ta11  1  0.847  0.653  0.117  1.0
  Ta  Ta12  1  0.180  0.697  0.267  1.0
  Ta  Ta13  1  0.033  0.256  0.947  1.0
  Ta  Ta14  1  0.267  0.962  0.941  1.0
  Ta  Ta15  1  0.076  0.443  0.612  1.0
  Ta  Ta16  1  0.496  0.682  0.955  1.0
  Ta  Ta17  1  0.174  0.704  0.778  1.0
  Ta  Ta18  1  0.751  0.450  0.459  1.0
  Ta  Ta19  1  0.929  0.963  0.782  1.0
  Ta  Ta20  1  0.924  0.942  0.271  1.0
  Ta  Ta21  1  0.239  0.952  0.426  1.0
  O  O22  1  0.929  0.955  0.023  1.0
  O  O23  1  0.751  0.424  0.695  1.0
  O  O24  1  0.937  0.453  0.034  1.0
  O  O25  1  0.440  0.956  0.531  1.0
[/CIF]
.
The material structure described by Ta11O2 crystallizes in the triclinic P1 space group. There are twenty-two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a single-bond geometry to one O(4) atom. In the second Ta site, Ta(2) is bonded in a 4-coordinate geometry to one Ta(10), one Ta(16), one Ta(21), and one Ta(3) atom. In the third Ta site, Ta(3) is bonded in a 1-coordinate geometry to one Ta(2), one Ta(6), and one O(4) atom. In the fourth Ta site, Ta(4) is bonded in a 5-coordinate geometry to one Ta(10), one Ta(14), one Ta(15), one Ta(5), and one O(1) atom. In the fifth Ta site, Ta(5) is bonded in a 2-coordinate geometry to one Ta(4) and one Ta(8) atom. In the sixth Ta site, Ta(6) is bonded in a 5-coordinate geometry to one Ta(11), one Ta(16), one Ta(17), one Ta(3), and one O(2) atom. In the seventh Ta site, Ta(7) is bonded in a 5-coordinate geometry to one Ta(10), one Ta(15), one Ta(17), one Ta(21), and one O(1) atom. In the eighth Ta site, Ta(8) is bonded in a distorted single-bond geometry to one Ta(5), one Ta(9), and one O(4) atom. In the ninth Ta site, Ta(9) is bonded in a 5-coordinate geometry to one Ta(18), one Ta(19), one Ta(20), one Ta(8), and one O(2) atom. In the tenth Ta site, Ta(10) is bonded in a 4-coordinate geometry to one Ta(19), one Ta(2), one Ta(4), and one Ta(7) atom. In the eleventh Ta site, Ta(11) is bonded in a distorted water-like geometry to one Ta(6), one O(2), and one O(3) atom. In the twelfth Ta site, Ta(12) is bonded in a distorted single-bond geometry to one O(1) and one O(3) atom. In the thirteenth Ta site, Ta(13) is bonded in a distorted single-bond geometry to one O(3) atom. In the fourteenth Ta site, Ta(14) is bonded in a distorted single-bond geometry to one Ta(4), one O(1), and one O(3) atom. In the fifteenth Ta site, Ta(15) is bonded in a 5-coordinate geometry to one Ta(18), one Ta(20), one Ta(4), one Ta(7), and one O(1) atom. In the sixteenth Ta site, Ta(16) is bonded in a 5-coordinate geometry to one Ta(18), one Ta(19), one Ta(2), one Ta(6), and one O(2) atom. In the seventeenth Ta site, Ta(17) is bonded in a 2-coordinate geometry to one Ta(6) and one Ta(7) atom. In the eighteenth Ta site, Ta(18) is bonded in a 2-coordinate geometry to one Ta(15), one Ta(16), and one Ta(9) atom. In the nineteenth Ta site, Ta(19) is bonded in a distorted single-bond geometry to one Ta(10), one Ta(16), one Ta(9), and one O(2) atom. In the twentieth Ta site, Ta(20) is bonded in a distorted single-bond geometry to one Ta(15), one Ta(9), and one O(1) atom. In the twenty-first Ta site, Ta(21) is bonded in a distorted single-bond geometry to one Ta(2), one Ta(7), and one O(1) atom. In the twenty-second Ta site, Ta(22) is bonded in a single-bond geometry to one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted pentagonal bipyramidal geometry to one Ta(12), one Ta(14), one Ta(15), one Ta(20), one Ta(21), one Ta(4), and one Ta(7) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Ta(11), one Ta(16), one Ta(19), one Ta(6), and one Ta(9) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ta(11), one Ta(12), one Ta(13), and one Ta(14) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Ta(1), one Ta(22), one Ta(3), and one Ta(8) atom. is represented by the CIF file [CIF]
data_Ta11O2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.493
_cell_length_b   7.524
_cell_length_c   9.309
_cell_angle_alpha   110.003
_cell_angle_beta   107.355
_cell_angle_gamma   101.793
_symmetry_Int_Tables_number   1
_cell_volume   442.388
_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  0.622  0.978  0.648  1.0
  Ta  Ta1  1  0.023  0.214  0.421  1.0
  Ta  Ta2  1  0.336  0.199  0.606  1.0
  Ta  Ta3  1  0.331  0.202  0.109  1.0
  Ta  Ta4  1  0.437  0.452  0.277  1.0
  Ta  Ta5  1  0.441  0.458  0.761  1.0
  Ta  Ta6  1  0.594  0.955  0.101  1.0
  Ta  Ta7  1  0.504  0.708  0.444  1.0
  Ta  Ta8  1  0.849  0.741  0.601  1.0
  Ta  Ta9  1  0.682  0.202  0.279  1.0
  Ta  Ta10  1  0.734  0.435  0.918  1.0
  Ta  Ta11  1  0.847  0.653  0.117  1.0
  Ta  Ta12  1  0.180  0.697  0.267  1.0
  Ta  Ta13  1  0.033  0.256  0.947  1.0
  Ta  Ta14  1  0.267  0.962  0.941  1.0
  Ta  Ta15  1  0.076  0.443  0.612  1.0
  Ta  Ta16  1  0.496  0.682  0.955  1.0
  Ta  Ta17  1  0.174  0.704  0.778  1.0
  Ta  Ta18  1  0.751  0.450  0.459  1.0
  Ta  Ta19  1  0.929  0.963  0.782  1.0
  Ta  Ta20  1  0.924  0.942  0.271  1.0
  Ta  Ta21  1  0.239  0.952  0.426  1.0
  O  O22  1  0.929  0.955  0.023  1.0
  O  O23  1  0.751  0.424  0.695  1.0
  O  O24  1  0.937  0.453  0.034  1.0
  O  O25  1  0.440  0.956  0.531  1.0
[/CIF]
.