The material described by Ba3SrSb2O9 is Orthorhombic Perovskite-derived structured and crystallizes in the triclinic P-1 space group. There are three inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 9-coordinate geometry to one O(5), one O(8), two equivalent O(3), two equivalent O(7), and three equivalent O(1) atoms. In the second Ba site, Ba(2) is bonded in a 6-coordinate geometry to one O(2), one O(5), one O(6), one O(9), and three equivalent O(4) atoms. In the third Ba site, Ba(3) is bonded in a 10-coordinate geometry to one O(2), one O(3), one O(6), one O(7), two equivalent O(5), two equivalent O(8), and two equivalent O(9) atoms. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form SrO6 octahedra that share corners with six equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 21-28°. In the second Sr site, Sr(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(7) atoms to form SrO6 octahedra that share corners with six equivalent Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 18-25°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(2), one O(4), one O(5), one O(6), one O(8), and one O(9) atom to form SbO6 octahedra that share corners with three equivalent Sr(1)O6 octahedra and  a faceface with one Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 21-28°. In the second Sb site, Sb(2) is bonded to one O(1), one O(3), one O(5), one O(7), one O(8), and one O(9) atom to form SbO6 octahedra that share corners with three equivalent Sr(2)O6 octahedra and  a faceface with one Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 18-25°. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to three equivalent Ba(1), one Sr(2), and one Sb(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ba(2), one Ba(3), one Sr(1), and one Sb(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ba(3), two equivalent Ba(1), one Sr(2), and one Sb(2) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to three equivalent Ba(2), one Sr(1), and one Sb(1) atom. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(2), two equivalent Ba(3), one Sb(1), and one Sb(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ba(2), one Ba(3), one Sr(1), and one Sb(1) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Ba(3), two equivalent Ba(1), one Sr(2), and one Sb(2) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Ba(1), two equivalent Ba(3), one Sb(1), and one Sb(2) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Ba(2), two equivalent Ba(3), one Sb(1), and one Sb(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ba3SrSb2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.173
_cell_length_b   6.180
_cell_length_c   15.375
_cell_angle_alpha   91.140
_cell_angle_beta   91.889
_cell_angle_gamma   119.419
_symmetry_Int_Tables_number   1
_cell_volume   510.198
_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
  Ba  Ba0  1  0.319  0.647  0.407  1.0
  Ba  Ba1  1  0.681  0.353  0.593  1.0
  Ba  Ba2  1  0.656  0.331  0.903  1.0
  Ba  Ba3  1  0.980  0.002  0.250  1.0
  Ba  Ba4  1  0.020  0.998  0.750  1.0
  Ba  Ba5  1  0.344  0.669  0.097  1.0
  Sr  Sr6  1  0.000  0.000  0.000  1.0
  Sr  Sr7  1  0.000  0.000  0.500  1.0
  Sb  Sb8  1  0.301  0.640  0.844  1.0
  Sb  Sb9  1  0.637  0.305  0.343  1.0
  Sb  Sb10  1  0.363  0.695  0.657  1.0
  Sb  Sb11  1  0.699  0.360  0.156  1.0
  O  O12  1  0.224  0.420  0.569  1.0
  O  O13  1  0.894  0.226  0.102  1.0
  O  O14  1  0.260  0.907  0.596  1.0
  O  O15  1  0.776  0.580  0.431  1.0
  O  O16  1  0.569  0.755  0.934  1.0
  O  O17  1  0.464  0.508  0.753  1.0
  O  O18  1  0.901  0.693  0.111  1.0
  O  O19  1  0.431  0.245  0.066  1.0
  O  O20  1  0.099  0.307  0.889  1.0
  O  O21  1  0.699  0.853  0.613  1.0
  O  O22  1  0.106  0.774  0.898  1.0
  O  O23  1  0.051  0.536  0.729  1.0
  O  O24  1  0.536  0.492  0.247  1.0
  O  O25  1  0.949  0.464  0.271  1.0
  O  O26  1  0.740  0.093  0.404  1.0
  O  O27  1  0.301  0.147  0.387  1.0
  O  O28  1  0.516  0.053  0.232  1.0
  O  O29  1  0.484  0.947  0.768  1.0
[/CIF]
.
The material described by Ba3SrSb2O9 is Orthorhombic Perovskite-derived structured and crystallizes in the triclinic P-1 space group. There are three inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 9-coordinate geometry to one O(5), one O(8), two equivalent O(3), two equivalent O(7), and three equivalent O(1) atoms. In the second Ba site, Ba(2) is bonded in a 6-coordinate geometry to one O(2), one O(5), one O(6), one O(9), and three equivalent O(4) atoms. In the third Ba site, Ba(3) is bonded in a 10-coordinate geometry to one O(2), one O(3), one O(6), one O(7), two equivalent O(5), two equivalent O(8), and two equivalent O(9) atoms. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form SrO6 octahedra that share corners with six equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 21-28°. In the second Sr site, Sr(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(7) atoms to form SrO6 octahedra that share corners with six equivalent Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 18-25°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(2), one O(4), one O(5), one O(6), one O(8), and one O(9) atom to form SbO6 octahedra that share corners with three equivalent Sr(1)O6 octahedra and  a faceface with one Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 21-28°. In the second Sb site, Sb(2) is bonded to one O(1), one O(3), one O(5), one O(7), one O(8), and one O(9) atom to form SbO6 octahedra that share corners with three equivalent Sr(2)O6 octahedra and  a faceface with one Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 18-25°. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to three equivalent Ba(1), one Sr(2), and one Sb(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ba(2), one Ba(3), one Sr(1), and one Sb(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ba(3), two equivalent Ba(1), one Sr(2), and one Sb(2) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to three equivalent Ba(2), one Sr(1), and one Sb(1) atom. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(2), two equivalent Ba(3), one Sb(1), and one Sb(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ba(2), one Ba(3), one Sr(1), and one Sb(1) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Ba(3), two equivalent Ba(1), one Sr(2), and one Sb(2) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Ba(1), two equivalent Ba(3), one Sb(1), and one Sb(2) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Ba(2), two equivalent Ba(3), one Sb(1), and one Sb(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ba3SrSb2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.173
_cell_length_b   6.180
_cell_length_c   15.375
_cell_angle_alpha   91.140
_cell_angle_beta   91.889
_cell_angle_gamma   119.419
_symmetry_Int_Tables_number   1
_cell_volume   510.198
_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
  Ba  Ba0  1  0.319  0.647  0.407  1.0
  Ba  Ba1  1  0.681  0.353  0.593  1.0
  Ba  Ba2  1  0.656  0.331  0.903  1.0
  Ba  Ba3  1  0.980  0.002  0.250  1.0
  Ba  Ba4  1  0.020  0.998  0.750  1.0
  Ba  Ba5  1  0.344  0.669  0.097  1.0
  Sr  Sr6  1  0.000  0.000  0.000  1.0
  Sr  Sr7  1  0.000  0.000  0.500  1.0
  Sb  Sb8  1  0.301  0.640  0.844  1.0
  Sb  Sb9  1  0.637  0.305  0.343  1.0
  Sb  Sb10  1  0.363  0.695  0.657  1.0
  Sb  Sb11  1  0.699  0.360  0.156  1.0
  O  O12  1  0.224  0.420  0.569  1.0
  O  O13  1  0.894  0.226  0.102  1.0
  O  O14  1  0.260  0.907  0.596  1.0
  O  O15  1  0.776  0.580  0.431  1.0
  O  O16  1  0.569  0.755  0.934  1.0
  O  O17  1  0.464  0.508  0.753  1.0
  O  O18  1  0.901  0.693  0.111  1.0
  O  O19  1  0.431  0.245  0.066  1.0
  O  O20  1  0.099  0.307  0.889  1.0
  O  O21  1  0.699  0.853  0.613  1.0
  O  O22  1  0.106  0.774  0.898  1.0
  O  O23  1  0.051  0.536  0.729  1.0
  O  O24  1  0.536  0.492  0.247  1.0
  O  O25  1  0.949  0.464  0.271  1.0
  O  O26  1  0.740  0.093  0.404  1.0
  O  O27  1  0.301  0.147  0.387  1.0
  O  O28  1  0.516  0.053  0.232  1.0
  O  O29  1  0.484  0.947  0.768  1.0
[/CIF]
.