The material structure described by BiTa7O19 crystallizes in the hexagonal P6_322 space group. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 6-coordinate geometry to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms. In the second Ta site, Ta(2) is bonded in an octahedral geometry to six equivalent O(3) atoms. Bi(1) is bonded in a 6-coordinate geometry to six equivalent O(3) atoms. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to two equivalent Ta(1) atoms. In the second O site, O(2) is bonded in a linear geometry to two equivalent Ta(1) atoms. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(2), and one Bi(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to three equivalent Ta(1) atoms. In the fifth O site, O(5) is bonded in a trigonal planar geometry to three equivalent Ta(1) atoms. is represented by the CIF file [CIF]
data_Ta7BiO19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.299
_cell_length_b   6.299
_cell_length_c   20.286
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   697.170
_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  0.997  0.641  0.906  1.0
  Ta  Ta1  1  0.003  0.644  0.094  1.0
  Ta  Ta2  1  0.997  0.356  0.594  1.0
  Ta  Ta3  1  0.003  0.359  0.406  1.0
  Ta  Ta4  1  0.333  0.667  0.250  1.0
  Ta  Ta5  1  0.359  0.356  0.906  1.0
  Ta  Ta6  1  0.356  0.359  0.094  1.0
  Ta  Ta7  1  0.641  0.644  0.406  1.0
  Ta  Ta8  1  0.644  0.641  0.594  1.0
  Ta  Ta9  1  0.356  0.997  0.406  1.0
  Ta  Ta10  1  0.359  0.003  0.594  1.0
  Ta  Ta11  1  0.667  0.333  0.750  1.0
  Ta  Ta12  1  0.644  0.003  0.906  1.0
  Ta  Ta13  1  0.641  0.997  0.094  1.0
  Bi  Bi14  1  0.333  0.667  0.750  1.0
  Bi  Bi15  1  0.667  0.333  0.250  1.0
  O  O16  1  0.003  0.757  0.597  1.0
  O  O17  1  0.997  0.754  0.403  1.0
  O  O18  1  0.000  0.608  0.000  1.0
  O  O19  1  0.953  0.571  0.806  1.0
  O  O20  1  0.047  0.618  0.194  1.0
  O  O21  1  0.047  0.429  0.306  1.0
  O  O22  1  0.953  0.382  0.694  1.0
  O  O23  1  0.000  0.392  0.500  1.0
  O  O24  1  0.003  0.246  0.903  1.0
  O  O25  1  0.997  0.243  0.097  1.0
  O  O26  1  0.333  0.667  0.889  1.0
  O  O27  1  0.333  0.667  0.409  1.0
  O  O28  1  0.333  0.667  0.611  1.0
  O  O29  1  0.333  0.667  0.091  1.0
  O  O30  1  0.243  0.246  0.597  1.0
  O  O31  1  0.246  0.243  0.403  1.0
  O  O32  1  0.392  0.392  0.000  1.0
  O  O33  1  0.429  0.382  0.806  1.0
  O  O34  1  0.382  0.429  0.194  1.0
  O  O35  1  0.243  0.997  0.903  1.0
  O  O36  1  0.246  0.003  0.097  1.0
  O  O37  1  0.571  0.618  0.306  1.0
  O  O38  1  0.618  0.571  0.694  1.0
  O  O39  1  0.608  0.608  0.500  1.0
  O  O40  1  0.754  0.757  0.903  1.0
  O  O41  1  0.757  0.754  0.097  1.0
  O  O42  1  0.392  0.000  0.500  1.0
  O  O43  1  0.429  0.047  0.694  1.0
  O  O44  1  0.382  0.953  0.306  1.0
  O  O45  1  0.667  0.333  0.389  1.0
  O  O46  1  0.667  0.333  0.591  1.0
  O  O47  1  0.667  0.333  0.909  1.0
  O  O48  1  0.667  0.333  0.111  1.0
  O  O49  1  0.618  0.047  0.806  1.0
  O  O50  1  0.571  0.953  0.194  1.0
  O  O51  1  0.608  0.000  0.000  1.0
  O  O52  1  0.754  0.997  0.597  1.0
  O  O53  1  0.757  0.003  0.403  1.0
[/CIF]
.
The material structure described by BiTa7O19 crystallizes in the hexagonal P6_322 space group. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 6-coordinate geometry to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms. In the second Ta site, Ta(2) is bonded in an octahedral geometry to six equivalent O(3) atoms. Bi(1) is bonded in a 6-coordinate geometry to six equivalent O(3) atoms. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to two equivalent Ta(1) atoms. In the second O site, O(2) is bonded in a linear geometry to two equivalent Ta(1) atoms. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(2), and one Bi(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to three equivalent Ta(1) atoms. In the fifth O site, O(5) is bonded in a trigonal planar geometry to three equivalent Ta(1) atoms. is represented by the CIF file [CIF]
data_Ta7BiO19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.299
_cell_length_b   6.299
_cell_length_c   20.286
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   697.170
_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  0.997  0.641  0.906  1.0
  Ta  Ta1  1  0.003  0.644  0.094  1.0
  Ta  Ta2  1  0.997  0.356  0.594  1.0
  Ta  Ta3  1  0.003  0.359  0.406  1.0
  Ta  Ta4  1  0.333  0.667  0.250  1.0
  Ta  Ta5  1  0.359  0.356  0.906  1.0
  Ta  Ta6  1  0.356  0.359  0.094  1.0
  Ta  Ta7  1  0.641  0.644  0.406  1.0
  Ta  Ta8  1  0.644  0.641  0.594  1.0
  Ta  Ta9  1  0.356  0.997  0.406  1.0
  Ta  Ta10  1  0.359  0.003  0.594  1.0
  Ta  Ta11  1  0.667  0.333  0.750  1.0
  Ta  Ta12  1  0.644  0.003  0.906  1.0
  Ta  Ta13  1  0.641  0.997  0.094  1.0
  Bi  Bi14  1  0.333  0.667  0.750  1.0
  Bi  Bi15  1  0.667  0.333  0.250  1.0
  O  O16  1  0.003  0.757  0.597  1.0
  O  O17  1  0.997  0.754  0.403  1.0
  O  O18  1  0.000  0.608  0.000  1.0
  O  O19  1  0.953  0.571  0.806  1.0
  O  O20  1  0.047  0.618  0.194  1.0
  O  O21  1  0.047  0.429  0.306  1.0
  O  O22  1  0.953  0.382  0.694  1.0
  O  O23  1  0.000  0.392  0.500  1.0
  O  O24  1  0.003  0.246  0.903  1.0
  O  O25  1  0.997  0.243  0.097  1.0
  O  O26  1  0.333  0.667  0.889  1.0
  O  O27  1  0.333  0.667  0.409  1.0
  O  O28  1  0.333  0.667  0.611  1.0
  O  O29  1  0.333  0.667  0.091  1.0
  O  O30  1  0.243  0.246  0.597  1.0
  O  O31  1  0.246  0.243  0.403  1.0
  O  O32  1  0.392  0.392  0.000  1.0
  O  O33  1  0.429  0.382  0.806  1.0
  O  O34  1  0.382  0.429  0.194  1.0
  O  O35  1  0.243  0.997  0.903  1.0
  O  O36  1  0.246  0.003  0.097  1.0
  O  O37  1  0.571  0.618  0.306  1.0
  O  O38  1  0.618  0.571  0.694  1.0
  O  O39  1  0.608  0.608  0.500  1.0
  O  O40  1  0.754  0.757  0.903  1.0
  O  O41  1  0.757  0.754  0.097  1.0
  O  O42  1  0.392  0.000  0.500  1.0
  O  O43  1  0.429  0.047  0.694  1.0
  O  O44  1  0.382  0.953  0.306  1.0
  O  O45  1  0.667  0.333  0.389  1.0
  O  O46  1  0.667  0.333  0.591  1.0
  O  O47  1  0.667  0.333  0.909  1.0
  O  O48  1  0.667  0.333  0.111  1.0
  O  O49  1  0.618  0.047  0.806  1.0
  O  O50  1  0.571  0.953  0.194  1.0
  O  O51  1  0.608  0.000  0.000  1.0
  O  O52  1  0.754  0.997  0.597  1.0
  O  O53  1  0.757  0.003  0.403  1.0
[/CIF]
.