The material 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 Ta(17), one Ta(2), and one O(4) atom. In the second Ta site, Ta(2) is bonded in a 12-coordinate geometry to one Ta(1), one Ta(10), one Ta(13), one Ta(16), one Ta(19), one Ta(20), one Ta(21), one Ta(22), one Ta(3), one Ta(4), one Ta(5), and one Ta(9) atom. In the third Ta site, Ta(3) is bonded in a single-bond geometry to one Ta(2), one Ta(5), and one O(4) atom. In the fourth Ta site, Ta(4) is bonded in a 10-coordinate geometry to one Ta(11), one Ta(13), one Ta(14), one Ta(15), one Ta(17), one Ta(2), one Ta(21), one Ta(22), one Ta(5), one Ta(6), and one Ta(7) atom. In the fifth Ta site, Ta(5) is bonded in a distorted body-centered cubic geometry to one Ta(10), one Ta(12), one Ta(13), one Ta(17), one Ta(2), one Ta(3), one Ta(4), and one Ta(8) atom. In the sixth Ta site, Ta(6) is bonded in a single-bond geometry to one Ta(17), one Ta(4), and one O(2) atom. In the seventh Ta site, Ta(7) is bonded in a single-bond geometry to one Ta(13), one Ta(17), one Ta(4), and one O(1) atom. In the eighth Ta site, Ta(8) is bonded in a single-bond geometry to one Ta(13), one Ta(5), and one O(4) atom. In the ninth Ta site, Ta(9) is bonded in a single-bond geometry to one Ta(13), one Ta(17), one Ta(2), and one O(2) atom. In the tenth Ta site, Ta(10) is bonded in a linear geometry to one Ta(2), one Ta(5), one O(3), and one O(4) atom. In the eleventh Ta site, Ta(11) is bonded in a distorted bent 150 degrees geometry to one Ta(17), one Ta(4), one O(2), and one O(3) atom. In the twelfth Ta site, Ta(12) is bonded in a distorted bent 150 degrees geometry to one Ta(13), one Ta(17), one Ta(5), one O(1), and one O(3) atom. In the thirteenth Ta site, Ta(13) is bonded in a 13-coordinate geometry to one Ta(12), one Ta(15), one Ta(16), one Ta(17), one Ta(19), one Ta(2), one Ta(21), one Ta(22), one Ta(4), one Ta(5), one Ta(7), one Ta(8), and one Ta(9) atom. In the fourteenth Ta site, Ta(14) is bonded in a distorted bent 150 degrees geometry to one Ta(4), one O(1), and one O(3) atom. In the fifteenth Ta site, Ta(15) is bonded in a single-bond geometry to one Ta(13), one Ta(17), one Ta(4), and one O(1) atom. In the sixteenth Ta site, Ta(16) is bonded in a single-bond geometry to one Ta(13), one Ta(2), and one O(2) atom. In the seventeenth Ta site, Ta(17) is bonded in a 12-coordinate geometry to one Ta(1), one Ta(11), one Ta(12), one Ta(13), one Ta(15), one Ta(18), one Ta(20), one Ta(4), one Ta(5), one Ta(6), one Ta(7), and one Ta(9) atom. In the eighteenth Ta site, Ta(18) is bonded in a linear geometry to one Ta(17), one O(3), and one O(4) atom. In the nineteenth Ta site, Ta(19) is bonded in a single-bond geometry to one Ta(13), one Ta(2), and one O(2) atom. In the twentieth Ta site, Ta(20) is bonded in a single-bond geometry to one Ta(17), one Ta(2), and one O(1) atom. In the twenty-first Ta site, Ta(21) is bonded in a single-bond geometry to one Ta(13), one Ta(2), one Ta(4), and one O(1) atom. In the twenty-second Ta site, Ta(22) is bonded in a single-bond geometry to one Ta(13), one Ta(2), one Ta(4), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Ta(12), one Ta(14), one Ta(15), one Ta(20), one Ta(21), and one Ta(7) atom to form corner-sharing OTa6 octahedra. In the second O site, O(2) is bonded to one Ta(11), one Ta(16), one Ta(19), one Ta(6), and one Ta(9) atom to form corner-sharing OTa5 square pyramids. In the third O site, O(3) is bonded to one Ta(10), one Ta(11), one Ta(12), one Ta(14), and one Ta(18) atom to form OTa5 square pyramids that share corners with two equivalent O(1)Ta6 octahedra, corners with two equivalent O(4)Ta6 octahedra, and  a cornercorner with one O(2)Ta5 square pyramid. The corner-sharing octahedral tilt angles range from 4-45°. In the fourth O site, O(4) is bonded to one Ta(1), one Ta(10), one Ta(18), one Ta(22), one Ta(3), and one Ta(8) atom to form corner-sharing OTa6 octahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ta11O2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   13.580
_cell_length_b   7.493
_cell_length_c   9.765
_cell_angle_alpha   63.778
_cell_angle_beta   44.225
_cell_angle_gamma   40.864
_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  0.978  0.293  0.374  1.0
  Ta  Ta1  1  0.214  0.230  0.365  1.0
  Ta  Ta2  1  0.199  0.743  0.195  1.0
  Ta  Ta3  1  0.202  0.238  0.689  1.0
  Ta  Ta4  1  0.452  0.261  0.271  1.0
  Ta  Ta5  1  0.458  0.744  0.781  1.0
  Ta  Ta6  1  0.955  0.740  0.944  1.0
  Ta  Ta7  1  0.708  0.241  0.848  1.0
  Ta  Ta8  1  0.741  0.708  0.658  1.0
  Ta  Ta9  1  0.202  0.758  0.520  1.0
  Ta  Ta10  1  0.435  0.217  0.647  1.0
  Ta  Ta11  1  0.653  0.311  0.230  1.0
  Ta  Ta12  1  0.697  0.750  0.036  1.0
  Ta  Ta13  1  0.256  0.723  0.797  1.0
  Ta  Ta14  1  0.962  0.246  0.097  1.0
  Ta  Ta15  1  0.443  0.245  0.946  1.0
  Ta  Ta16  1  0.682  0.769  0.364  1.0
  Ta  Ta17  1  0.704  0.249  0.518  1.0
  Ta  Ta18  1  0.450  0.761  0.091  1.0
  Ta  Ta19  1  0.963  0.748  0.255  1.0
  Ta  Ta20  1  0.942  0.253  0.788  1.0
  Ta  Ta21  1  0.952  0.712  0.622  1.0
  O  O22  1  0.955  0.997  0.022  1.0
  O  O23  1  0.424  0.022  0.881  1.0
  O  O24  1  0.453  0.518  0.513  1.0
  O  O25  1  0.956  0.015  0.514  1.0
[/CIF]
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The material 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 Ta(17), one Ta(2), and one O(4) atom. In the second Ta site, Ta(2) is bonded in a 12-coordinate geometry to one Ta(1), one Ta(10), one Ta(13), one Ta(16), one Ta(19), one Ta(20), one Ta(21), one Ta(22), one Ta(3), one Ta(4), one Ta(5), and one Ta(9) atom. In the third Ta site, Ta(3) is bonded in a single-bond geometry to one Ta(2), one Ta(5), and one O(4) atom. In the fourth Ta site, Ta(4) is bonded in a 10-coordinate geometry to one Ta(11), one Ta(13), one Ta(14), one Ta(15), one Ta(17), one Ta(2), one Ta(21), one Ta(22), one Ta(5), one Ta(6), and one Ta(7) atom. In the fifth Ta site, Ta(5) is bonded in a distorted body-centered cubic geometry to one Ta(10), one Ta(12), one Ta(13), one Ta(17), one Ta(2), one Ta(3), one Ta(4), and one Ta(8) atom. In the sixth Ta site, Ta(6) is bonded in a single-bond geometry to one Ta(17), one Ta(4), and one O(2) atom. In the seventh Ta site, Ta(7) is bonded in a single-bond geometry to one Ta(13), one Ta(17), one Ta(4), and one O(1) atom. In the eighth Ta site, Ta(8) is bonded in a single-bond geometry to one Ta(13), one Ta(5), and one O(4) atom. In the ninth Ta site, Ta(9) is bonded in a single-bond geometry to one Ta(13), one Ta(17), one Ta(2), and one O(2) atom. In the tenth Ta site, Ta(10) is bonded in a linear geometry to one Ta(2), one Ta(5), one O(3), and one O(4) atom. In the eleventh Ta site, Ta(11) is bonded in a distorted bent 150 degrees geometry to one Ta(17), one Ta(4), one O(2), and one O(3) atom. In the twelfth Ta site, Ta(12) is bonded in a distorted bent 150 degrees geometry to one Ta(13), one Ta(17), one Ta(5), one O(1), and one O(3) atom. In the thirteenth Ta site, Ta(13) is bonded in a 13-coordinate geometry to one Ta(12), one Ta(15), one Ta(16), one Ta(17), one Ta(19), one Ta(2), one Ta(21), one Ta(22), one Ta(4), one Ta(5), one Ta(7), one Ta(8), and one Ta(9) atom. In the fourteenth Ta site, Ta(14) is bonded in a distorted bent 150 degrees geometry to one Ta(4), one O(1), and one O(3) atom. In the fifteenth Ta site, Ta(15) is bonded in a single-bond geometry to one Ta(13), one Ta(17), one Ta(4), and one O(1) atom. In the sixteenth Ta site, Ta(16) is bonded in a single-bond geometry to one Ta(13), one Ta(2), and one O(2) atom. In the seventeenth Ta site, Ta(17) is bonded in a 12-coordinate geometry to one Ta(1), one Ta(11), one Ta(12), one Ta(13), one Ta(15), one Ta(18), one Ta(20), one Ta(4), one Ta(5), one Ta(6), one Ta(7), and one Ta(9) atom. In the eighteenth Ta site, Ta(18) is bonded in a linear geometry to one Ta(17), one O(3), and one O(4) atom. In the nineteenth Ta site, Ta(19) is bonded in a single-bond geometry to one Ta(13), one Ta(2), and one O(2) atom. In the twentieth Ta site, Ta(20) is bonded in a single-bond geometry to one Ta(17), one Ta(2), and one O(1) atom. In the twenty-first Ta site, Ta(21) is bonded in a single-bond geometry to one Ta(13), one Ta(2), one Ta(4), and one O(1) atom. In the twenty-second Ta site, Ta(22) is bonded in a single-bond geometry to one Ta(13), one Ta(2), one Ta(4), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Ta(12), one Ta(14), one Ta(15), one Ta(20), one Ta(21), and one Ta(7) atom to form corner-sharing OTa6 octahedra. In the second O site, O(2) is bonded to one Ta(11), one Ta(16), one Ta(19), one Ta(6), and one Ta(9) atom to form corner-sharing OTa5 square pyramids. In the third O site, O(3) is bonded to one Ta(10), one Ta(11), one Ta(12), one Ta(14), and one Ta(18) atom to form OTa5 square pyramids that share corners with two equivalent O(1)Ta6 octahedra, corners with two equivalent O(4)Ta6 octahedra, and  a cornercorner with one O(2)Ta5 square pyramid. The corner-sharing octahedral tilt angles range from 4-45°. In the fourth O site, O(4) is bonded to one Ta(1), one Ta(10), one Ta(18), one Ta(22), one Ta(3), and one Ta(8) atom to form corner-sharing OTa6 octahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ta11O2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   13.580
_cell_length_b   7.493
_cell_length_c   9.765
_cell_angle_alpha   63.778
_cell_angle_beta   44.225
_cell_angle_gamma   40.864
_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  0.978  0.293  0.374  1.0
  Ta  Ta1  1  0.214  0.230  0.365  1.0
  Ta  Ta2  1  0.199  0.743  0.195  1.0
  Ta  Ta3  1  0.202  0.238  0.689  1.0
  Ta  Ta4  1  0.452  0.261  0.271  1.0
  Ta  Ta5  1  0.458  0.744  0.781  1.0
  Ta  Ta6  1  0.955  0.740  0.944  1.0
  Ta  Ta7  1  0.708  0.241  0.848  1.0
  Ta  Ta8  1  0.741  0.708  0.658  1.0
  Ta  Ta9  1  0.202  0.758  0.520  1.0
  Ta  Ta10  1  0.435  0.217  0.647  1.0
  Ta  Ta11  1  0.653  0.311  0.230  1.0
  Ta  Ta12  1  0.697  0.750  0.036  1.0
  Ta  Ta13  1  0.256  0.723  0.797  1.0
  Ta  Ta14  1  0.962  0.246  0.097  1.0
  Ta  Ta15  1  0.443  0.245  0.946  1.0
  Ta  Ta16  1  0.682  0.769  0.364  1.0
  Ta  Ta17  1  0.704  0.249  0.518  1.0
  Ta  Ta18  1  0.450  0.761  0.091  1.0
  Ta  Ta19  1  0.963  0.748  0.255  1.0
  Ta  Ta20  1  0.942  0.253  0.788  1.0
  Ta  Ta21  1  0.952  0.712  0.622  1.0
  O  O22  1  0.955  0.997  0.022  1.0
  O  O23  1  0.424  0.022  0.881  1.0
  O  O24  1  0.453  0.518  0.513  1.0
  O  O25  1  0.956  0.015  0.514  1.0
[/CIF]
.