The structure described by Sr2TaMnO6 is (Cubic) Perovskite-derived structured and crystallizes in the triclinic P-1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(2), one O(4), one O(6), three equivalent O(1), three equivalent O(3), and three equivalent O(5) atoms to form SrO12 cuboctahedra that share corners with six equivalent Sr(1)O12 cuboctahedra, corners with six equivalent Sr(2)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra,  a faceface with one Mn(1)O6 octahedra, faces with three equivalent Mn(2)O6 octahedra, and faces with four equivalent Ta(1)O6 octahedra. In the second Sr site, Sr(2) is bonded to one O(1), one O(3), one O(5), three equivalent O(2), three equivalent O(4), and three equivalent O(6) atoms to form SrO12 cuboctahedra that share corners with six equivalent Sr(1)O12 cuboctahedra, corners with six equivalent Sr(2)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra,  a faceface with one Mn(2)O6 octahedra, faces with three equivalent Mn(1)O6 octahedra, and faces with four equivalent Ta(1)O6 octahedra. Ta(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form TaO6 octahedra that share corners with three equivalent Mn(1)O6 octahedra, corners with three equivalent Mn(2)O6 octahedra, faces with four equivalent Sr(1)O12 cuboctahedra, and faces with four equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 6-8°. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form MnO6 octahedra that share corners with six equivalent Ta(1)O6 octahedra, faces with two equivalent Sr(1)O12 cuboctahedra, and faces with six equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 6-8°. In the second Mn site, Mn(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form MnO6 octahedra that share corners with six equivalent Ta(1)O6 octahedra, faces with two equivalent Sr(2)O12 cuboctahedra, and faces with six equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 6-8°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Sr(2), three equivalent Sr(1), one Ta(1), and one Mn(2) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Sr(1), three equivalent Sr(2), one Ta(1), and one Mn(1) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one Sr(2), three equivalent Sr(1), one Ta(1), and one Mn(2) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Sr(1), three equivalent Sr(2), one Ta(1), and one Mn(1) atom. In the fifth O site, O(5) is bonded in a distorted linear geometry to one Sr(2), three equivalent Sr(1), one Ta(1), and one Mn(2) atom. In the sixth O site, O(6) is bonded in a distorted linear geometry to one Sr(1), three equivalent Sr(2), one Ta(1), and one Mn(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2TaMnO6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.661
_cell_length_b   5.713
_cell_length_c   9.860
_cell_angle_alpha   72.921
_cell_angle_beta   90.066
_cell_angle_gamma   60.214
_symmetry_Int_Tables_number   1
_cell_volume   260.379
_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
  Sr  Sr0  1  0.377  0.245  0.124  1.0
  Sr  Sr1  1  0.873  0.254  0.625  1.0
  Sr  Sr2  1  0.123  0.755  0.376  1.0
  Sr  Sr3  1  0.627  0.746  0.875  1.0
  Ta  Ta4  1  0.009  0.982  1.000  1.0
  Ta  Ta5  1  0.491  0.018  0.500  1.0
  Mn  Mn6  1  0.250  0.500  0.750  1.0
  Mn  Mn7  1  0.750  0.500  0.250  1.0
  O  O8  1  0.616  0.277  0.379  1.0
  O  O9  1  0.134  0.218  0.873  1.0
  O  O10  1  0.600  0.800  0.371  1.0
  O  O11  1  0.146  0.707  0.882  1.0
  O  O12  1  0.107  0.278  0.379  1.0
  O  O13  1  0.646  0.219  0.873  1.0
  O  O14  1  0.884  0.723  0.121  1.0
  O  O15  1  0.366  0.782  0.627  1.0
  O  O16  1  0.900  0.200  0.129  1.0
  O  O17  1  0.354  0.292  0.618  1.0
  O  O18  1  0.393  0.722  0.121  1.0
  O  O19  1  0.854  0.781  0.627  1.0
[/CIF]
.
The structure described by Sr2TaMnO6 is (Cubic) Perovskite-derived structured and crystallizes in the triclinic P-1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(2), one O(4), one O(6), three equivalent O(1), three equivalent O(3), and three equivalent O(5) atoms to form SrO12 cuboctahedra that share corners with six equivalent Sr(1)O12 cuboctahedra, corners with six equivalent Sr(2)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra,  a faceface with one Mn(1)O6 octahedra, faces with three equivalent Mn(2)O6 octahedra, and faces with four equivalent Ta(1)O6 octahedra. In the second Sr site, Sr(2) is bonded to one O(1), one O(3), one O(5), three equivalent O(2), three equivalent O(4), and three equivalent O(6) atoms to form SrO12 cuboctahedra that share corners with six equivalent Sr(1)O12 cuboctahedra, corners with six equivalent Sr(2)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra,  a faceface with one Mn(2)O6 octahedra, faces with three equivalent Mn(1)O6 octahedra, and faces with four equivalent Ta(1)O6 octahedra. Ta(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form TaO6 octahedra that share corners with three equivalent Mn(1)O6 octahedra, corners with three equivalent Mn(2)O6 octahedra, faces with four equivalent Sr(1)O12 cuboctahedra, and faces with four equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 6-8°. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form MnO6 octahedra that share corners with six equivalent Ta(1)O6 octahedra, faces with two equivalent Sr(1)O12 cuboctahedra, and faces with six equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 6-8°. In the second Mn site, Mn(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form MnO6 octahedra that share corners with six equivalent Ta(1)O6 octahedra, faces with two equivalent Sr(2)O12 cuboctahedra, and faces with six equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 6-8°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Sr(2), three equivalent Sr(1), one Ta(1), and one Mn(2) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Sr(1), three equivalent Sr(2), one Ta(1), and one Mn(1) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one Sr(2), three equivalent Sr(1), one Ta(1), and one Mn(2) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Sr(1), three equivalent Sr(2), one Ta(1), and one Mn(1) atom. In the fifth O site, O(5) is bonded in a distorted linear geometry to one Sr(2), three equivalent Sr(1), one Ta(1), and one Mn(2) atom. In the sixth O site, O(6) is bonded in a distorted linear geometry to one Sr(1), three equivalent Sr(2), one Ta(1), and one Mn(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2TaMnO6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.661
_cell_length_b   5.713
_cell_length_c   9.860
_cell_angle_alpha   72.921
_cell_angle_beta   90.066
_cell_angle_gamma   60.214
_symmetry_Int_Tables_number   1
_cell_volume   260.379
_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
  Sr  Sr0  1  0.377  0.245  0.124  1.0
  Sr  Sr1  1  0.873  0.254  0.625  1.0
  Sr  Sr2  1  0.123  0.755  0.376  1.0
  Sr  Sr3  1  0.627  0.746  0.875  1.0
  Ta  Ta4  1  0.009  0.982  1.000  1.0
  Ta  Ta5  1  0.491  0.018  0.500  1.0
  Mn  Mn6  1  0.250  0.500  0.750  1.0
  Mn  Mn7  1  0.750  0.500  0.250  1.0
  O  O8  1  0.616  0.277  0.379  1.0
  O  O9  1  0.134  0.218  0.873  1.0
  O  O10  1  0.600  0.800  0.371  1.0
  O  O11  1  0.146  0.707  0.882  1.0
  O  O12  1  0.107  0.278  0.379  1.0
  O  O13  1  0.646  0.219  0.873  1.0
  O  O14  1  0.884  0.723  0.121  1.0
  O  O15  1  0.366  0.782  0.627  1.0
  O  O16  1  0.900  0.200  0.129  1.0
  O  O17  1  0.354  0.292  0.618  1.0
  O  O18  1  0.393  0.722  0.121  1.0
  O  O19  1  0.854  0.781  0.627  1.0
[/CIF]
.