The material structure described by Ta6Al8O27F crystallizes in the triclinic P1 space group. There are six inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 4-coordinate geometry to one O(1), one O(16), one O(17), and one O(6) atom. In the second Ta site, Ta(2) is bonded in a 8-coordinate geometry to one O(10), one O(14), one O(15), one O(18), one O(2), one O(22), one O(26), and one O(5) atom. In the third Ta site, Ta(3) is bonded in a 1-coordinate geometry to one O(1) and one O(11) atom. In the fourth Ta site, Ta(4) is bonded in a 1-coordinate geometry to one O(12) and one O(2) atom. In the fifth Ta site, Ta(5) is bonded in a 4-coordinate geometry to one O(16), one O(23), one O(25), one O(3), and one O(9) atom. In the sixth Ta site, Ta(6) is bonded in a 4-coordinate geometry to one O(10), one O(15), one O(2), one O(24), one O(26), and one O(4) atom. There are eight inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted linear geometry to one O(11), one O(14), one O(16), and one O(17) atom. In the second Al site, Al(2) is bonded in a distorted linear geometry to one O(12), one O(13), one O(15), and one O(18) atom. In the third Al site, Al(3) is bonded in a distorted rectangular see-saw-like geometry to one O(22), one O(27), one O(3), and one O(9) atom. In the fourth Al site, Al(4) is bonded in a distorted rectangular see-saw-like geometry to one O(10), one O(21), one O(4), and one F(1) atom. In the fifth Al site, Al(5) is bonded in a distorted bent 150 degrees geometry to one O(11), one O(17), and one O(27) atom. In the sixth Al site, Al(6) is bonded in a 2-coordinate geometry to one O(12), one O(18), and one F(1) atom. In the seventh Al site, Al(7) is bonded in a distorted linear geometry to one O(19), one O(25), one O(5), and one O(7) atom. In the eighth Al site, Al(8) is bonded in a 2-coordinate geometry to one O(20), one O(26), one O(6), and one O(8) atom. There are twenty-seven inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Ta(1) and one Ta(3) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Ta(2), one Ta(4), one Ta(6), one O(14), and one O(22) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Ta(5) and one Al(3) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one Ta(6) and one Al(4) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Ta(2) and one Al(7) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Ta(1) and one Al(8) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Al(7) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Al(8) atom. In the ninth O site, O(9) is bonded in a 2-coordinate geometry to one Ta(5) and one Al(3) atom. In the tenth O site, O(10) is bonded in a distorted L-shaped geometry to one Ta(2), one Ta(6), and one Al(4) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Ta(3), one Al(1), and one Al(5) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Ta(4), one Al(2), and one Al(6) atom. In the thirteenth O site, O(13) is bonded in a single-bond geometry to one Al(2) atom. In the fourteenth O site, O(14) is bonded in a single-bond geometry to one Ta(2), one Al(1), and one O(2) atom. In the fifteenth O site, O(15) is bonded in a 3-coordinate geometry to one Ta(2), one Ta(6), and one Al(2) atom. In the sixteenth O site, O(16) is bonded in a 3-coordinate geometry to one Ta(1), one Ta(5), and one Al(1) atom. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to one Ta(1), one Al(1), and one Al(5) atom. In the eighteenth O site, O(18) is bonded in a 3-coordinate geometry to one Ta(2), one Al(2), and one Al(6) atom. In the nineteenth O site, O(19) is bonded in a single-bond geometry to one Al(7) atom. In the twentieth O site, O(20) is bonded in a distorted single-bond geometry to one Al(8) atom. In the twenty-first O site, O(21) is bonded in a distorted single-bond geometry to one Al(4) atom. In the twenty-second O site, O(22) is bonded in a distorted single-bond geometry to one Ta(2), one Al(3), and one O(2) atom. In the twenty-third O site, O(23) is bonded in a distorted single-bond geometry to one Ta(5) atom. In the twenty-fourth O site, O(24) is bonded in a distorted single-bond geometry to one Ta(6) atom. In the twenty-fifth O site, O(25) is bonded in a distorted bent 120 degrees geometry to one Ta(5) and one Al(7) atom. In the twenty-sixth O site, O(26) is bonded in a distorted bent 120 degrees geometry to one Ta(2), one Ta(6), and one Al(8) atom. In the twenty-seventh O site, O(27) is bonded in a distorted single-bond geometry to one Al(3) and one Al(5) atom. F(1) is bonded in a distorted single-bond geometry to one Al(4) and one Al(6) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ta6Al8O27F
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.436
_cell_length_b   8.738
_cell_length_c   8.741
_cell_angle_alpha   63.371
_cell_angle_beta   64.827
_cell_angle_gamma   64.839
_symmetry_Int_Tables_number   1
_cell_volume   439.788
_cell_formula_units_Z   1
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  0.790  0.819  0.072  1.0
  Ta  Ta1  1  0.287  0.322  0.570  1.0
  Ta  Ta2  1  0.709  0.570  0.820  1.0
  Ta  Ta3  1  0.213  0.072  0.321  1.0
  Ta  Ta4  1  0.373  0.735  0.982  1.0
  Ta  Ta5  1  0.877  0.233  0.485  1.0
  Al  Al6  1  0.872  0.129  0.872  1.0
  Al  Al7  1  0.372  0.627  0.372  1.0
  Al  Al8  1  0.285  0.412  0.161  1.0
  Al  Al9  1  0.777  0.922  0.659  1.0
  Al  Al10  1  0.600  0.276  0.027  1.0
  Al  Al11  1  0.099  0.783  0.518  1.0
  Al  Al12  1  0.240  0.187  0.936  1.0
  Al  Al13  1  0.728  0.691  0.428  1.0
  O  O14  1  0.717  0.616  0.050  1.0
  O  O15  1  0.219  0.115  0.552  1.0
  O  O16  1  0.400  0.504  0.022  1.0
  O  O17  1  0.899  0.999  0.527  1.0
  O  O18  1  0.333  0.289  0.807  1.0
  O  O19  1  0.840  0.787  0.314  1.0
  O  O20  1  0.043  0.430  0.948  1.0
  O  O21  1  0.552  0.923  0.450  1.0
  O  O22  1  0.121  0.641  0.169  1.0
  O  O23  1  0.619  0.147  0.667  1.0
  O  O24  1  0.692  0.355  0.882  1.0
  O  O25  1  0.193  0.857  0.378  1.0
  O  O26  1  0.471  0.715  0.236  1.0
  O  O27  1  0.977  0.213  0.739  1.0
  O  O28  1  0.548  0.393  0.371  1.0
  O  O29  1  0.044  0.893  0.867  1.0
  O  O30  1  0.782  0.041  0.018  1.0
  O  O31  1  0.279  0.544  0.519  1.0
  O  O32  1  0.136  0.100  0.076  1.0
  O  O33  1  0.638  0.601  0.576  1.0
  O  O34  1  0.736  0.796  0.818  1.0
  O  O35  1  0.235  0.295  0.320  1.0
  O  O36  1  0.357  0.724  0.744  1.0
  O  O37  1  0.864  0.221  0.248  1.0
  O  O38  1  0.441  0.945  0.970  1.0
  O  O39  1  0.937  0.448  0.470  1.0
  O  O40  1  0.463  0.204  0.130  1.0
  F  F41  1  0.973  0.694  0.639  1.0
[/CIF]
.
The material structure described by Ta6Al8O27F crystallizes in the triclinic P1 space group. There are six inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 4-coordinate geometry to one O(1), one O(16), one O(17), and one O(6) atom. In the second Ta site, Ta(2) is bonded in a 8-coordinate geometry to one O(10), one O(14), one O(15), one O(18), one O(2), one O(22), one O(26), and one O(5) atom. In the third Ta site, Ta(3) is bonded in a 1-coordinate geometry to one O(1) and one O(11) atom. In the fourth Ta site, Ta(4) is bonded in a 1-coordinate geometry to one O(12) and one O(2) atom. In the fifth Ta site, Ta(5) is bonded in a 4-coordinate geometry to one O(16), one O(23), one O(25), one O(3), and one O(9) atom. In the sixth Ta site, Ta(6) is bonded in a 4-coordinate geometry to one O(10), one O(15), one O(2), one O(24), one O(26), and one O(4) atom. There are eight inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted linear geometry to one O(11), one O(14), one O(16), and one O(17) atom. In the second Al site, Al(2) is bonded in a distorted linear geometry to one O(12), one O(13), one O(15), and one O(18) atom. In the third Al site, Al(3) is bonded in a distorted rectangular see-saw-like geometry to one O(22), one O(27), one O(3), and one O(9) atom. In the fourth Al site, Al(4) is bonded in a distorted rectangular see-saw-like geometry to one O(10), one O(21), one O(4), and one F(1) atom. In the fifth Al site, Al(5) is bonded in a distorted bent 150 degrees geometry to one O(11), one O(17), and one O(27) atom. In the sixth Al site, Al(6) is bonded in a 2-coordinate geometry to one O(12), one O(18), and one F(1) atom. In the seventh Al site, Al(7) is bonded in a distorted linear geometry to one O(19), one O(25), one O(5), and one O(7) atom. In the eighth Al site, Al(8) is bonded in a 2-coordinate geometry to one O(20), one O(26), one O(6), and one O(8) atom. There are twenty-seven inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Ta(1) and one Ta(3) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Ta(2), one Ta(4), one Ta(6), one O(14), and one O(22) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Ta(5) and one Al(3) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one Ta(6) and one Al(4) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Ta(2) and one Al(7) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Ta(1) and one Al(8) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Al(7) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Al(8) atom. In the ninth O site, O(9) is bonded in a 2-coordinate geometry to one Ta(5) and one Al(3) atom. In the tenth O site, O(10) is bonded in a distorted L-shaped geometry to one Ta(2), one Ta(6), and one Al(4) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Ta(3), one Al(1), and one Al(5) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Ta(4), one Al(2), and one Al(6) atom. In the thirteenth O site, O(13) is bonded in a single-bond geometry to one Al(2) atom. In the fourteenth O site, O(14) is bonded in a single-bond geometry to one Ta(2), one Al(1), and one O(2) atom. In the fifteenth O site, O(15) is bonded in a 3-coordinate geometry to one Ta(2), one Ta(6), and one Al(2) atom. In the sixteenth O site, O(16) is bonded in a 3-coordinate geometry to one Ta(1), one Ta(5), and one Al(1) atom. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to one Ta(1), one Al(1), and one Al(5) atom. In the eighteenth O site, O(18) is bonded in a 3-coordinate geometry to one Ta(2), one Al(2), and one Al(6) atom. In the nineteenth O site, O(19) is bonded in a single-bond geometry to one Al(7) atom. In the twentieth O site, O(20) is bonded in a distorted single-bond geometry to one Al(8) atom. In the twenty-first O site, O(21) is bonded in a distorted single-bond geometry to one Al(4) atom. In the twenty-second O site, O(22) is bonded in a distorted single-bond geometry to one Ta(2), one Al(3), and one O(2) atom. In the twenty-third O site, O(23) is bonded in a distorted single-bond geometry to one Ta(5) atom. In the twenty-fourth O site, O(24) is bonded in a distorted single-bond geometry to one Ta(6) atom. In the twenty-fifth O site, O(25) is bonded in a distorted bent 120 degrees geometry to one Ta(5) and one Al(7) atom. In the twenty-sixth O site, O(26) is bonded in a distorted bent 120 degrees geometry to one Ta(2), one Ta(6), and one Al(8) atom. In the twenty-seventh O site, O(27) is bonded in a distorted single-bond geometry to one Al(3) and one Al(5) atom. F(1) is bonded in a distorted single-bond geometry to one Al(4) and one Al(6) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ta6Al8O27F
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.436
_cell_length_b   8.738
_cell_length_c   8.741
_cell_angle_alpha   63.371
_cell_angle_beta   64.827
_cell_angle_gamma   64.839
_symmetry_Int_Tables_number   1
_cell_volume   439.788
_cell_formula_units_Z   1
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  0.790  0.819  0.072  1.0
  Ta  Ta1  1  0.287  0.322  0.570  1.0
  Ta  Ta2  1  0.709  0.570  0.820  1.0
  Ta  Ta3  1  0.213  0.072  0.321  1.0
  Ta  Ta4  1  0.373  0.735  0.982  1.0
  Ta  Ta5  1  0.877  0.233  0.485  1.0
  Al  Al6  1  0.872  0.129  0.872  1.0
  Al  Al7  1  0.372  0.627  0.372  1.0
  Al  Al8  1  0.285  0.412  0.161  1.0
  Al  Al9  1  0.777  0.922  0.659  1.0
  Al  Al10  1  0.600  0.276  0.027  1.0
  Al  Al11  1  0.099  0.783  0.518  1.0
  Al  Al12  1  0.240  0.187  0.936  1.0
  Al  Al13  1  0.728  0.691  0.428  1.0
  O  O14  1  0.717  0.616  0.050  1.0
  O  O15  1  0.219  0.115  0.552  1.0
  O  O16  1  0.400  0.504  0.022  1.0
  O  O17  1  0.899  0.999  0.527  1.0
  O  O18  1  0.333  0.289  0.807  1.0
  O  O19  1  0.840  0.787  0.314  1.0
  O  O20  1  0.043  0.430  0.948  1.0
  O  O21  1  0.552  0.923  0.450  1.0
  O  O22  1  0.121  0.641  0.169  1.0
  O  O23  1  0.619  0.147  0.667  1.0
  O  O24  1  0.692  0.355  0.882  1.0
  O  O25  1  0.193  0.857  0.378  1.0
  O  O26  1  0.471  0.715  0.236  1.0
  O  O27  1  0.977  0.213  0.739  1.0
  O  O28  1  0.548  0.393  0.371  1.0
  O  O29  1  0.044  0.893  0.867  1.0
  O  O30  1  0.782  0.041  0.018  1.0
  O  O31  1  0.279  0.544  0.519  1.0
  O  O32  1  0.136  0.100  0.076  1.0
  O  O33  1  0.638  0.601  0.576  1.0
  O  O34  1  0.736  0.796  0.818  1.0
  O  O35  1  0.235  0.295  0.320  1.0
  O  O36  1  0.357  0.724  0.744  1.0
  O  O37  1  0.864  0.221  0.248  1.0
  O  O38  1  0.441  0.945  0.970  1.0
  O  O39  1  0.937  0.448  0.470  1.0
  O  O40  1  0.463  0.204  0.130  1.0
  F  F41  1  0.973  0.694  0.639  1.0
[/CIF]
.