The material structure described by Ta8Cr3O24 crystallizes in the orthorhombic Imm2 space group. There are eight inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to two equivalent O(5), two equivalent O(7), and two equivalent O(8) atoms to form TaO6 octahedra that share corners with two equivalent Ta(5)O6 octahedra, corners with two equivalent Ta(6)O6 octahedra, corners with two equivalent Cr(1)O6 octahedra, corners with two equivalent Cr(2)O6 octahedra,  an edgeedge with one Ta(2)O6 octahedra, and  an edgeedge with one Ta(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-55°. In the second Ta site, Ta(2) is bonded to two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms to form TaO6 octahedra that share corners with two equivalent Ta(4)O6 octahedra, corners with two equivalent Cr(1)O6 octahedra, corners with two equivalent Cr(2)O6 octahedra,  an edgeedge with one Ta(1)O6 octahedra, and  an edgeedge with one Cr(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-58°. In the third Ta site, Ta(3) is bonded to two equivalent O(1), two equivalent O(6), and two equivalent O(7) atoms to form a mixture of corner and edge-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 34-49°. In the fourth Ta site, Ta(4) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(6) atoms to form TaO6 octahedra that share corners with two equivalent Ta(2)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, corners with two equivalent Ta(8)O6 octahedra, corners with two equivalent Cr(3)O6 octahedra,  an edgeedge with one Ta(5)O6 octahedra, and  an edgeedge with one Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-55°. In the fifth Ta site, Ta(5) is bonded to two equivalent O(10), two equivalent O(2), and two equivalent O(7) atoms to form TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, corners with two equivalent Ta(7)O6 octahedra, corners with two equivalent Cr(3)O6 octahedra,  an edgeedge with one Ta(4)O6 octahedra, and  an edgeedge with one Cr(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-52°. In the sixth Ta site, Ta(6) is bonded to two equivalent O(1), two equivalent O(11), and two equivalent O(8) atoms to form TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, corners with two equivalent Ta(7)O6 octahedra, corners with two equivalent Cr(3)O6 octahedra, and  an edgeedge with one Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 34-53°. In the seventh Ta site, Ta(7) is bonded to two equivalent O(10), two equivalent O(11), and two equivalent O(12) atoms to form TaO6 octahedra that share corners with two equivalent Ta(5)O6 octahedra, corners with two equivalent Ta(6)O6 octahedra, corners with two equivalent Cr(1)O6 octahedra, corners with two equivalent Cr(2)O6 octahedra,  an edgeedge with one Ta(8)O6 octahedra, and  an edgeedge with one Cr(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-54°. In the eighth Ta site, Ta(8) is bonded to two equivalent O(12), two equivalent O(6), and two equivalent O(9) atoms to form TaO6 octahedra that share corners with two equivalent Ta(4)O6 octahedra, corners with two equivalent Cr(1)O6 octahedra, corners with two equivalent Cr(2)O6 octahedra,  an edgeedge with one Ta(3)O6 octahedra, and  an edgeedge with one Ta(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 35-53°. There are three inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to two equivalent O(12), two equivalent O(3), and two equivalent O(8) atoms to form CrO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(2)O6 octahedra, corners with two equivalent Ta(7)O6 octahedra, corners with two equivalent Ta(8)O6 octahedra,  an edgeedge with one Ta(4)O6 octahedra, and  an edgeedge with one Ta(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-55°. In the second Cr site, Cr(2) is bonded to two equivalent O(10), two equivalent O(5), and two equivalent O(9) atoms to form CrO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(2)O6 octahedra, corners with two equivalent Ta(7)O6 octahedra, corners with two equivalent Ta(8)O6 octahedra, and  an edgeedge with one Ta(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 35-58°. In the third Cr site, Cr(3) is bonded to two equivalent O(11), two equivalent O(2), and two equivalent O(4) atoms to form CrO6 octahedra that share corners with two equivalent Ta(4)O6 octahedra, corners with two equivalent Ta(5)O6 octahedra, corners with two equivalent Ta(6)O6 octahedra,  an edgeedge with one Ta(2)O6 octahedra, and  an edgeedge with one Ta(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-53°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Ta(3) and one Ta(6) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Ta(4), one Ta(5), and one Cr(3) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Ta(2), one Ta(4), and one Cr(1) atom. In the fourth O site, O(4) is bonded in an L-shaped geometry to one Ta(2) and one Cr(3) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(2), and one Cr(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Ta(3), one Ta(4), and one Ta(8) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Ta(1), one Ta(3), and one Ta(5) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(6), and one Cr(1) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one Ta(8) and one Cr(2) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Ta(5), one Ta(7), and one Cr(2) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Ta(6), one Ta(7), and one Cr(3) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Ta(7), one Ta(8), and one Cr(1) atom. is represented by the CIF card [CIF]
data_Ta8Cr3O24
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.442
_cell_length_b   10.442
_cell_length_c   10.442
_cell_angle_alpha   142.336
_cell_angle_beta   142.146
_cell_angle_gamma   54.466
_symmetry_Int_Tables_number   1
_cell_volume   423.938
_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  0.324  0.824  0.500  1.0
  Ta  Ta1  1  0.153  0.653  0.500  1.0
  Ta  Ta2  1  0.500  0.000  0.500  1.0
  Ta  Ta3  1  0.084  0.084  0.000  1.0
  Ta  Ta4  1  0.915  0.915  0.000  1.0
  Ta  Ta5  1  0.423  0.423  0.000  1.0
  Ta  Ta6  1  0.835  0.335  0.500  1.0
  Ta  Ta7  1  0.672  0.172  0.500  1.0
  Cr  Cr8  1  0.253  0.253  0.000  1.0
  Cr  Cr9  1  0.743  0.743  0.000  1.0
  Cr  Cr10  1  0.000  0.500  0.500  1.0
  O  O11  1  0.489  0.275  0.786  1.0
  O  O12  1  1.000  0.809  0.810  1.0
  O  O13  1  0.164  0.971  0.807  1.0
  O  O14  1  0.273  0.582  0.691  1.0
  O  O15  1  0.448  0.751  0.696  1.0
  O  O16  1  0.055  0.751  0.304  1.0
  O  O17  1  0.892  0.582  0.309  1.0
  O  O18  1  0.384  0.081  0.303  1.0
  O  O19  1  0.217  0.916  0.301  1.0
  O  O20  1  0.336  0.537  0.201  1.0
  O  O21  1  0.679  0.898  0.219  1.0
  O  O22  1  0.164  0.358  0.193  1.0
  O  O23  1  0.336  0.135  0.799  1.0
  O  O24  1  0.837  0.639  0.802  1.0
  O  O25  1  0.679  0.459  0.781  1.0
  O  O26  1  0.779  0.081  0.697  1.0
  O  O27  1  0.615  0.916  0.699  1.0
  O  O28  1  0.115  0.415  0.700  1.0
  O  O29  1  0.952  0.256  0.696  1.0
  O  O30  1  0.560  0.256  0.304  1.0
  O  O31  1  0.715  0.415  0.300  1.0
  O  O32  1  0.837  0.036  0.198  1.0
  O  O33  1  1.000  0.190  0.190  1.0
  O  O34  1  0.489  0.704  0.214  1.0
[/CIF]
.
The material structure described by Ta8Cr3O24 crystallizes in the orthorhombic Imm2 space group. There are eight inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to two equivalent O(5), two equivalent O(7), and two equivalent O(8) atoms to form TaO6 octahedra that share corners with two equivalent Ta(5)O6 octahedra, corners with two equivalent Ta(6)O6 octahedra, corners with two equivalent Cr(1)O6 octahedra, corners with two equivalent Cr(2)O6 octahedra,  an edgeedge with one Ta(2)O6 octahedra, and  an edgeedge with one Ta(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-55°. In the second Ta site, Ta(2) is bonded to two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms to form TaO6 octahedra that share corners with two equivalent Ta(4)O6 octahedra, corners with two equivalent Cr(1)O6 octahedra, corners with two equivalent Cr(2)O6 octahedra,  an edgeedge with one Ta(1)O6 octahedra, and  an edgeedge with one Cr(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-58°. In the third Ta site, Ta(3) is bonded to two equivalent O(1), two equivalent O(6), and two equivalent O(7) atoms to form a mixture of corner and edge-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 34-49°. In the fourth Ta site, Ta(4) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(6) atoms to form TaO6 octahedra that share corners with two equivalent Ta(2)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, corners with two equivalent Ta(8)O6 octahedra, corners with two equivalent Cr(3)O6 octahedra,  an edgeedge with one Ta(5)O6 octahedra, and  an edgeedge with one Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-55°. In the fifth Ta site, Ta(5) is bonded to two equivalent O(10), two equivalent O(2), and two equivalent O(7) atoms to form TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, corners with two equivalent Ta(7)O6 octahedra, corners with two equivalent Cr(3)O6 octahedra,  an edgeedge with one Ta(4)O6 octahedra, and  an edgeedge with one Cr(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-52°. In the sixth Ta site, Ta(6) is bonded to two equivalent O(1), two equivalent O(11), and two equivalent O(8) atoms to form TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, corners with two equivalent Ta(7)O6 octahedra, corners with two equivalent Cr(3)O6 octahedra, and  an edgeedge with one Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 34-53°. In the seventh Ta site, Ta(7) is bonded to two equivalent O(10), two equivalent O(11), and two equivalent O(12) atoms to form TaO6 octahedra that share corners with two equivalent Ta(5)O6 octahedra, corners with two equivalent Ta(6)O6 octahedra, corners with two equivalent Cr(1)O6 octahedra, corners with two equivalent Cr(2)O6 octahedra,  an edgeedge with one Ta(8)O6 octahedra, and  an edgeedge with one Cr(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-54°. In the eighth Ta site, Ta(8) is bonded to two equivalent O(12), two equivalent O(6), and two equivalent O(9) atoms to form TaO6 octahedra that share corners with two equivalent Ta(4)O6 octahedra, corners with two equivalent Cr(1)O6 octahedra, corners with two equivalent Cr(2)O6 octahedra,  an edgeedge with one Ta(3)O6 octahedra, and  an edgeedge with one Ta(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 35-53°. There are three inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to two equivalent O(12), two equivalent O(3), and two equivalent O(8) atoms to form CrO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(2)O6 octahedra, corners with two equivalent Ta(7)O6 octahedra, corners with two equivalent Ta(8)O6 octahedra,  an edgeedge with one Ta(4)O6 octahedra, and  an edgeedge with one Ta(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-55°. In the second Cr site, Cr(2) is bonded to two equivalent O(10), two equivalent O(5), and two equivalent O(9) atoms to form CrO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(2)O6 octahedra, corners with two equivalent Ta(7)O6 octahedra, corners with two equivalent Ta(8)O6 octahedra, and  an edgeedge with one Ta(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 35-58°. In the third Cr site, Cr(3) is bonded to two equivalent O(11), two equivalent O(2), and two equivalent O(4) atoms to form CrO6 octahedra that share corners with two equivalent Ta(4)O6 octahedra, corners with two equivalent Ta(5)O6 octahedra, corners with two equivalent Ta(6)O6 octahedra,  an edgeedge with one Ta(2)O6 octahedra, and  an edgeedge with one Ta(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-53°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Ta(3) and one Ta(6) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Ta(4), one Ta(5), and one Cr(3) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Ta(2), one Ta(4), and one Cr(1) atom. In the fourth O site, O(4) is bonded in an L-shaped geometry to one Ta(2) and one Cr(3) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(2), and one Cr(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Ta(3), one Ta(4), and one Ta(8) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Ta(1), one Ta(3), and one Ta(5) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(6), and one Cr(1) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one Ta(8) and one Cr(2) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Ta(5), one Ta(7), and one Cr(2) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Ta(6), one Ta(7), and one Cr(3) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Ta(7), one Ta(8), and one Cr(1) atom. is represented by the CIF card [CIF]
data_Ta8Cr3O24
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.442
_cell_length_b   10.442
_cell_length_c   10.442
_cell_angle_alpha   142.336
_cell_angle_beta   142.146
_cell_angle_gamma   54.466
_symmetry_Int_Tables_number   1
_cell_volume   423.938
_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  0.324  0.824  0.500  1.0
  Ta  Ta1  1  0.153  0.653  0.500  1.0
  Ta  Ta2  1  0.500  0.000  0.500  1.0
  Ta  Ta3  1  0.084  0.084  0.000  1.0
  Ta  Ta4  1  0.915  0.915  0.000  1.0
  Ta  Ta5  1  0.423  0.423  0.000  1.0
  Ta  Ta6  1  0.835  0.335  0.500  1.0
  Ta  Ta7  1  0.672  0.172  0.500  1.0
  Cr  Cr8  1  0.253  0.253  0.000  1.0
  Cr  Cr9  1  0.743  0.743  0.000  1.0
  Cr  Cr10  1  0.000  0.500  0.500  1.0
  O  O11  1  0.489  0.275  0.786  1.0
  O  O12  1  1.000  0.809  0.810  1.0
  O  O13  1  0.164  0.971  0.807  1.0
  O  O14  1  0.273  0.582  0.691  1.0
  O  O15  1  0.448  0.751  0.696  1.0
  O  O16  1  0.055  0.751  0.304  1.0
  O  O17  1  0.892  0.582  0.309  1.0
  O  O18  1  0.384  0.081  0.303  1.0
  O  O19  1  0.217  0.916  0.301  1.0
  O  O20  1  0.336  0.537  0.201  1.0
  O  O21  1  0.679  0.898  0.219  1.0
  O  O22  1  0.164  0.358  0.193  1.0
  O  O23  1  0.336  0.135  0.799  1.0
  O  O24  1  0.837  0.639  0.802  1.0
  O  O25  1  0.679  0.459  0.781  1.0
  O  O26  1  0.779  0.081  0.697  1.0
  O  O27  1  0.615  0.916  0.699  1.0
  O  O28  1  0.115  0.415  0.700  1.0
  O  O29  1  0.952  0.256  0.696  1.0
  O  O30  1  0.560  0.256  0.304  1.0
  O  O31  1  0.715  0.415  0.300  1.0
  O  O32  1  0.837  0.036  0.198  1.0
  O  O33  1  1.000  0.190  0.190  1.0
  O  O34  1  0.489  0.704  0.214  1.0
[/CIF]
.