The compound described by K3TaO2F7 crystallizes in the orthorhombic Pna2_1 space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to one F(3), one F(4), two equivalent F(6), and two equivalent F(7) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(1), one F(1), one F(2), one F(3), one F(4), one F(5), and two equivalent F(6) atoms. In the third K site, K(3) is bonded in a 6-coordinate geometry to one O(2), one F(1), one F(2), one F(5), and two equivalent F(7) atoms. Ta(1) is bonded in a distorted pentagonal bipyramidal geometry to one O(1), one O(2), one F(1), one F(2), one F(3), one F(4), and one F(5) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one K(2), one Ta(1), and one O(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one K(3), one Ta(1), and one O(1) atom. There are seven inequivalent F sites. In the first F site, F(3) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one Ta(1) atom. In the second F site, F(4) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one Ta(1) atom. In the third F site, F(5) is bonded in a distorted single-bond geometry to one K(2), one K(3), and one Ta(1) atom. In the fourth F site, F(6) is bonded in a distorted rectangular see-saw-like geometry to two equivalent K(1) and two equivalent K(2) atoms. In the fifth F site, F(7) is bonded to two equivalent K(1) and two equivalent K(3) atoms to form distorted edge-sharing FK4 tetrahedra. In the sixth F site, F(1) is bonded in a distorted trigonal non-coplanar geometry to one K(2), one K(3), and one Ta(1) atom. In the seventh F site, F(2) is bonded in a distorted single-bond geometry to one K(2), one K(3), and one Ta(1) atom. is represented by the CIF card [CIF]
data_K3TaO2F7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.252
_cell_length_b   9.521
_cell_length_c   14.109
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   974.116
_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
  K  K0  1  0.238  0.498  0.344  1.0
  K  K1  1  0.762  0.998  0.656  1.0
  K  K2  1  0.262  0.998  0.844  1.0
  K  K3  1  0.738  0.498  0.156  1.0
  K  K4  1  0.784  0.763  0.347  1.0
  K  K5  1  0.216  0.263  0.653  1.0
  K  K6  1  0.716  0.263  0.847  1.0
  K  K7  1  0.284  0.763  0.153  1.0
  K  K8  1  0.273  0.236  0.158  1.0
  K  K9  1  0.727  0.736  0.842  1.0
  K  K10  1  0.227  0.736  0.658  1.0
  K  K11  1  0.773  0.236  0.342  1.0
  Ta  Ta12  1  0.215  0.999  0.429  1.0
  Ta  Ta13  1  0.785  0.499  0.571  1.0
  Ta  Ta14  1  0.285  0.499  0.929  1.0
  Ta  Ta15  1  0.715  0.999  0.071  1.0
  O  O16  1  0.485  0.917  0.446  1.0
  O  O17  1  0.515  0.417  0.554  1.0
  O  O18  1  0.015  0.417  0.946  1.0
  O  O19  1  0.985  0.917  0.054  1.0
  O  O20  1  0.494  0.060  0.448  1.0
  O  O21  1  0.506  0.560  0.552  1.0
  O  O22  1  0.006  0.560  0.948  1.0
  O  O23  1  0.994  0.060  0.052  1.0
  F  F24  1  0.949  0.007  0.413  1.0
  F  F25  1  0.051  0.507  0.587  1.0
  F  F26  1  0.551  0.507  0.913  1.0
  F  F27  1  0.449  0.007  0.087  1.0
  F  F28  1  0.258  0.005  0.294  1.0
  F  F29  1  0.742  0.505  0.706  1.0
  F  F30  1  0.242  0.505  0.794  1.0
  F  F31  1  0.758  0.005  0.206  1.0
  F  F32  1  0.183  0.203  0.436  1.0
  F  F33  1  0.817  0.703  0.564  1.0
  F  F34  1  0.317  0.703  0.936  1.0
  F  F35  1  0.683  0.203  0.064  1.0
  F  F36  1  0.162  0.797  0.429  1.0
  F  F37  1  0.838  0.297  0.571  1.0
  F  F38  1  0.338  0.297  0.929  1.0
  F  F39  1  0.662  0.797  0.071  1.0
  F  F40  1  0.193  0.995  0.566  1.0
  F  F41  1  0.807  0.495  0.434  1.0
  F  F42  1  0.307  0.495  0.066  1.0
  F  F43  1  0.693  0.995  0.934  1.0
  F  F44  1  0.989  0.671  0.219  1.0
  F  F45  1  0.011  0.171  0.781  1.0
  F  F46  1  0.511  0.171  0.719  1.0
  F  F47  1  0.489  0.671  0.281  1.0
  F  F48  1  0.505  0.350  0.261  1.0
  F  F49  1  0.495  0.850  0.739  1.0
  F  F50  1  0.995  0.850  0.761  1.0
  F  F51  1  0.005  0.350  0.239  1.0
[/CIF]
.
The compound described by K3TaO2F7 crystallizes in the orthorhombic Pna2_1 space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to one F(3), one F(4), two equivalent F(6), and two equivalent F(7) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(1), one F(1), one F(2), one F(3), one F(4), one F(5), and two equivalent F(6) atoms. In the third K site, K(3) is bonded in a 6-coordinate geometry to one O(2), one F(1), one F(2), one F(5), and two equivalent F(7) atoms. Ta(1) is bonded in a distorted pentagonal bipyramidal geometry to one O(1), one O(2), one F(1), one F(2), one F(3), one F(4), and one F(5) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one K(2), one Ta(1), and one O(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one K(3), one Ta(1), and one O(1) atom. There are seven inequivalent F sites. In the first F site, F(3) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one Ta(1) atom. In the second F site, F(4) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one Ta(1) atom. In the third F site, F(5) is bonded in a distorted single-bond geometry to one K(2), one K(3), and one Ta(1) atom. In the fourth F site, F(6) is bonded in a distorted rectangular see-saw-like geometry to two equivalent K(1) and two equivalent K(2) atoms. In the fifth F site, F(7) is bonded to two equivalent K(1) and two equivalent K(3) atoms to form distorted edge-sharing FK4 tetrahedra. In the sixth F site, F(1) is bonded in a distorted trigonal non-coplanar geometry to one K(2), one K(3), and one Ta(1) atom. In the seventh F site, F(2) is bonded in a distorted single-bond geometry to one K(2), one K(3), and one Ta(1) atom. is represented by the CIF card [CIF]
data_K3TaO2F7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.252
_cell_length_b   9.521
_cell_length_c   14.109
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   974.116
_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
  K  K0  1  0.238  0.498  0.344  1.0
  K  K1  1  0.762  0.998  0.656  1.0
  K  K2  1  0.262  0.998  0.844  1.0
  K  K3  1  0.738  0.498  0.156  1.0
  K  K4  1  0.784  0.763  0.347  1.0
  K  K5  1  0.216  0.263  0.653  1.0
  K  K6  1  0.716  0.263  0.847  1.0
  K  K7  1  0.284  0.763  0.153  1.0
  K  K8  1  0.273  0.236  0.158  1.0
  K  K9  1  0.727  0.736  0.842  1.0
  K  K10  1  0.227  0.736  0.658  1.0
  K  K11  1  0.773  0.236  0.342  1.0
  Ta  Ta12  1  0.215  0.999  0.429  1.0
  Ta  Ta13  1  0.785  0.499  0.571  1.0
  Ta  Ta14  1  0.285  0.499  0.929  1.0
  Ta  Ta15  1  0.715  0.999  0.071  1.0
  O  O16  1  0.485  0.917  0.446  1.0
  O  O17  1  0.515  0.417  0.554  1.0
  O  O18  1  0.015  0.417  0.946  1.0
  O  O19  1  0.985  0.917  0.054  1.0
  O  O20  1  0.494  0.060  0.448  1.0
  O  O21  1  0.506  0.560  0.552  1.0
  O  O22  1  0.006  0.560  0.948  1.0
  O  O23  1  0.994  0.060  0.052  1.0
  F  F24  1  0.949  0.007  0.413  1.0
  F  F25  1  0.051  0.507  0.587  1.0
  F  F26  1  0.551  0.507  0.913  1.0
  F  F27  1  0.449  0.007  0.087  1.0
  F  F28  1  0.258  0.005  0.294  1.0
  F  F29  1  0.742  0.505  0.706  1.0
  F  F30  1  0.242  0.505  0.794  1.0
  F  F31  1  0.758  0.005  0.206  1.0
  F  F32  1  0.183  0.203  0.436  1.0
  F  F33  1  0.817  0.703  0.564  1.0
  F  F34  1  0.317  0.703  0.936  1.0
  F  F35  1  0.683  0.203  0.064  1.0
  F  F36  1  0.162  0.797  0.429  1.0
  F  F37  1  0.838  0.297  0.571  1.0
  F  F38  1  0.338  0.297  0.929  1.0
  F  F39  1  0.662  0.797  0.071  1.0
  F  F40  1  0.193  0.995  0.566  1.0
  F  F41  1  0.807  0.495  0.434  1.0
  F  F42  1  0.307  0.495  0.066  1.0
  F  F43  1  0.693  0.995  0.934  1.0
  F  F44  1  0.989  0.671  0.219  1.0
  F  F45  1  0.011  0.171  0.781  1.0
  F  F46  1  0.511  0.171  0.719  1.0
  F  F47  1  0.489  0.671  0.281  1.0
  F  F48  1  0.505  0.350  0.261  1.0
  F  F49  1  0.495  0.850  0.739  1.0
  F  F50  1  0.995  0.850  0.761  1.0
  F  F51  1  0.005  0.350  0.239  1.0
[/CIF]
.