The material described by FeTa2O6 is Hydrophilite-derived structured and crystallizes in the orthorhombic P2_12_12 space group. There are four inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(4), one O(5), one O(7), one O(9), and two equivalent O(6) atoms to form TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(2)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra,  an edgeedge with one Ta(2)O6 octahedra, and  an edgeedge with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 36-54°. In the second Ta site, Ta(2) is bonded to one O(1), one O(3), one O(4), one O(6), one O(8), and one O(9) atom to form TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(4)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra,  an edgeedge with one Ta(1)O6 octahedra, and  an edgeedge with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 36-59°. In the third Ta site, Ta(3) is bonded to two equivalent O(2), two equivalent O(5), and two equivalent O(7) atoms to form TaO6 octahedra that share corners with four equivalent Ta(1)O6 octahedra, corners with four equivalent Fe(1)O6 octahedra,  an edgeedge with one Ta(4)O6 octahedra, and  an edgeedge with one Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-54°. In the fourth Ta site, Ta(4) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(8) atoms to form TaO6 octahedra that share corners with four equivalent Ta(2)O6 octahedra, corners with four equivalent Fe(1)O6 octahedra,  an edgeedge with one Ta(3)O6 octahedra, and  an edgeedge with one Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-52°. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(2), one O(7), one O(9), and two equivalent O(3) atoms to form FeO6 octahedra that share corners with two equivalent Ta(2)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, corners with two equivalent Ta(4)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra,  an edgeedge with one Ta(1)O6 octahedra, and  an edgeedge with one Ta(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-59°. In the second Fe site, Fe(2) is bonded to two equivalent O(4), two equivalent O(5), and two equivalent O(8) atoms to form FeO6 octahedra that share corners with four equivalent Ta(1)O6 octahedra, corners with four equivalent Ta(2)O6 octahedra,  an edgeedge with one Ta(3)O6 octahedra, and  an edgeedge with one Ta(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-54°. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Ta(2), one Ta(4), and one Fe(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Ta(3), one Ta(4), and one Fe(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Ta(2) and two equivalent Fe(1) atoms. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Ta(1), one Ta(2), and one Fe(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(3), and one Fe(2) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Ta(2) and two equivalent Ta(1) atoms. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(3), and one Fe(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Ta(2), one Ta(4), and one Fe(2) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(2), and one Fe(1) atom. is represented by the CIF card [CIF]
data_Ta2FeO6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.826
_cell_length_b   9.317
_cell_length_c   14.448
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   649.648
_cell_formula_units_Z   6
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  0.002  0.585  0.837  1.0
  Ta  Ta1  1  0.004  0.239  0.829  1.0
  Ta  Ta2  1  0.998  0.585  0.163  1.0
  Ta  Ta3  1  0.996  0.239  0.171  1.0
  Ta  Ta4  1  0.000  0.248  0.500  1.0
  Ta  Ta5  1  0.500  0.092  0.000  1.0
  Ta  Ta6  1  0.500  0.752  0.000  1.0
  Ta  Ta7  1  0.496  0.761  0.329  1.0
  Ta  Ta8  1  0.504  0.761  0.671  1.0
  Ta  Ta9  1  0.498  0.415  0.337  1.0
  Ta  Ta10  1  0.502  0.415  0.663  1.0
  Ta  Ta11  1  0.000  0.908  0.500  1.0
  Fe  Fe12  1  0.007  0.917  0.832  1.0
  Fe  Fe13  1  0.993  0.917  0.168  1.0
  Fe  Fe14  1  0.000  0.582  0.500  1.0
  Fe  Fe15  1  0.493  0.083  0.332  1.0
  Fe  Fe16  1  0.507  0.083  0.668  1.0
  Fe  Fe17  1  0.500  0.418  0.000  1.0
  O  O18  1  0.210  0.098  0.100  1.0
  O  O19  1  0.188  0.083  0.438  1.0
  O  O20  1  0.197  0.099  0.763  1.0
  O  O21  1  0.177  0.421  0.103  1.0
  O  O22  1  0.202  0.402  0.430  1.0
  O  O23  1  0.206  0.418  0.770  1.0
  O  O24  1  0.208  0.734  0.098  1.0
  O  O25  1  0.206  0.762  0.431  1.0
  O  O26  1  0.205  0.733  0.763  1.0
  O  O27  1  0.312  0.917  0.938  1.0
  O  O28  1  0.294  0.238  0.931  1.0
  O  O29  1  0.303  0.901  0.263  1.0
  O  O30  1  0.290  0.902  0.600  1.0
  O  O31  1  0.295  0.267  0.263  1.0
  O  O32  1  0.292  0.266  0.598  1.0
  O  O33  1  0.298  0.598  0.930  1.0
  O  O34  1  0.294  0.582  0.270  1.0
  O  O35  1  0.323  0.579  0.603  1.0
  O  O36  1  0.677  0.579  0.397  1.0
  O  O37  1  0.702  0.598  0.070  1.0
  O  O38  1  0.706  0.582  0.730  1.0
  O  O39  1  0.688  0.917  0.062  1.0
  O  O40  1  0.706  0.238  0.069  1.0
  O  O41  1  0.710  0.902  0.400  1.0
  O  O42  1  0.708  0.266  0.402  1.0
  O  O43  1  0.697  0.901  0.737  1.0
  O  O44  1  0.705  0.267  0.737  1.0
  O  O45  1  0.792  0.734  0.902  1.0
  O  O46  1  0.795  0.733  0.237  1.0
  O  O47  1  0.794  0.762  0.569  1.0
  O  O48  1  0.823  0.421  0.897  1.0
  O  O49  1  0.794  0.418  0.230  1.0
  O  O50  1  0.798  0.402  0.570  1.0
  O  O51  1  0.790  0.098  0.900  1.0
  O  O52  1  0.803  0.099  0.237  1.0
  O  O53  1  0.812  0.083  0.562  1.0
[/CIF]
.
The material described by FeTa2O6 is Hydrophilite-derived structured and crystallizes in the orthorhombic P2_12_12 space group. There are four inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(4), one O(5), one O(7), one O(9), and two equivalent O(6) atoms to form TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(2)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra,  an edgeedge with one Ta(2)O6 octahedra, and  an edgeedge with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 36-54°. In the second Ta site, Ta(2) is bonded to one O(1), one O(3), one O(4), one O(6), one O(8), and one O(9) atom to form TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(4)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra,  an edgeedge with one Ta(1)O6 octahedra, and  an edgeedge with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 36-59°. In the third Ta site, Ta(3) is bonded to two equivalent O(2), two equivalent O(5), and two equivalent O(7) atoms to form TaO6 octahedra that share corners with four equivalent Ta(1)O6 octahedra, corners with four equivalent Fe(1)O6 octahedra,  an edgeedge with one Ta(4)O6 octahedra, and  an edgeedge with one Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-54°. In the fourth Ta site, Ta(4) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(8) atoms to form TaO6 octahedra that share corners with four equivalent Ta(2)O6 octahedra, corners with four equivalent Fe(1)O6 octahedra,  an edgeedge with one Ta(3)O6 octahedra, and  an edgeedge with one Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-52°. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(2), one O(7), one O(9), and two equivalent O(3) atoms to form FeO6 octahedra that share corners with two equivalent Ta(2)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, corners with two equivalent Ta(4)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra,  an edgeedge with one Ta(1)O6 octahedra, and  an edgeedge with one Ta(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-59°. In the second Fe site, Fe(2) is bonded to two equivalent O(4), two equivalent O(5), and two equivalent O(8) atoms to form FeO6 octahedra that share corners with four equivalent Ta(1)O6 octahedra, corners with four equivalent Ta(2)O6 octahedra,  an edgeedge with one Ta(3)O6 octahedra, and  an edgeedge with one Ta(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-54°. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Ta(2), one Ta(4), and one Fe(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Ta(3), one Ta(4), and one Fe(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Ta(2) and two equivalent Fe(1) atoms. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Ta(1), one Ta(2), and one Fe(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(3), and one Fe(2) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Ta(2) and two equivalent Ta(1) atoms. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(3), and one Fe(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Ta(2), one Ta(4), and one Fe(2) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(2), and one Fe(1) atom. is represented by the CIF card [CIF]
data_Ta2FeO6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.826
_cell_length_b   9.317
_cell_length_c   14.448
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   649.648
_cell_formula_units_Z   6
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  0.002  0.585  0.837  1.0
  Ta  Ta1  1  0.004  0.239  0.829  1.0
  Ta  Ta2  1  0.998  0.585  0.163  1.0
  Ta  Ta3  1  0.996  0.239  0.171  1.0
  Ta  Ta4  1  0.000  0.248  0.500  1.0
  Ta  Ta5  1  0.500  0.092  0.000  1.0
  Ta  Ta6  1  0.500  0.752  0.000  1.0
  Ta  Ta7  1  0.496  0.761  0.329  1.0
  Ta  Ta8  1  0.504  0.761  0.671  1.0
  Ta  Ta9  1  0.498  0.415  0.337  1.0
  Ta  Ta10  1  0.502  0.415  0.663  1.0
  Ta  Ta11  1  0.000  0.908  0.500  1.0
  Fe  Fe12  1  0.007  0.917  0.832  1.0
  Fe  Fe13  1  0.993  0.917  0.168  1.0
  Fe  Fe14  1  0.000  0.582  0.500  1.0
  Fe  Fe15  1  0.493  0.083  0.332  1.0
  Fe  Fe16  1  0.507  0.083  0.668  1.0
  Fe  Fe17  1  0.500  0.418  0.000  1.0
  O  O18  1  0.210  0.098  0.100  1.0
  O  O19  1  0.188  0.083  0.438  1.0
  O  O20  1  0.197  0.099  0.763  1.0
  O  O21  1  0.177  0.421  0.103  1.0
  O  O22  1  0.202  0.402  0.430  1.0
  O  O23  1  0.206  0.418  0.770  1.0
  O  O24  1  0.208  0.734  0.098  1.0
  O  O25  1  0.206  0.762  0.431  1.0
  O  O26  1  0.205  0.733  0.763  1.0
  O  O27  1  0.312  0.917  0.938  1.0
  O  O28  1  0.294  0.238  0.931  1.0
  O  O29  1  0.303  0.901  0.263  1.0
  O  O30  1  0.290  0.902  0.600  1.0
  O  O31  1  0.295  0.267  0.263  1.0
  O  O32  1  0.292  0.266  0.598  1.0
  O  O33  1  0.298  0.598  0.930  1.0
  O  O34  1  0.294  0.582  0.270  1.0
  O  O35  1  0.323  0.579  0.603  1.0
  O  O36  1  0.677  0.579  0.397  1.0
  O  O37  1  0.702  0.598  0.070  1.0
  O  O38  1  0.706  0.582  0.730  1.0
  O  O39  1  0.688  0.917  0.062  1.0
  O  O40  1  0.706  0.238  0.069  1.0
  O  O41  1  0.710  0.902  0.400  1.0
  O  O42  1  0.708  0.266  0.402  1.0
  O  O43  1  0.697  0.901  0.737  1.0
  O  O44  1  0.705  0.267  0.737  1.0
  O  O45  1  0.792  0.734  0.902  1.0
  O  O46  1  0.795  0.733  0.237  1.0
  O  O47  1  0.794  0.762  0.569  1.0
  O  O48  1  0.823  0.421  0.897  1.0
  O  O49  1  0.794  0.418  0.230  1.0
  O  O50  1  0.798  0.402  0.570  1.0
  O  O51  1  0.790  0.098  0.900  1.0
  O  O52  1  0.803  0.099  0.237  1.0
  O  O53  1  0.812  0.083  0.562  1.0
[/CIF]
.