The material described by BaAl2Sb2O7 crystallizes in the trigonal R32 space group. Ba(1) is bonded to six equivalent O(1) atoms to form distorted BaO6 pentagonal pyramids that share corners with six equivalent Al(1)O4 tetrahedra. Al(1) is bonded to one O(2) and three equivalent O(1) atoms to form AlO4 tetrahedra that share corners with three equivalent Ba(1)O6 pentagonal pyramids and  a cornercorner with one Al(1)O4 tetrahedra. Sb(1) is bonded in a distorted T-shaped geometry to three equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ba(1), one Al(1), and one Sb(1) atom. In the second O site, O(2) is bonded in a linear geometry to two equivalent Al(1) atoms. is represented by the CIF file [CIF]
data_BaAl2Sb2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.769
_cell_length_b   8.769
_cell_length_c   8.769
_cell_angle_alpha   36.631
_cell_angle_beta   36.631
_cell_angle_gamma   36.631
_symmetry_Int_Tables_number   1
_cell_volume   214.955
_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
  Ba  Ba0  1  0.500  0.500  0.500  1.0
  Al  Al1  1  0.929  0.929  0.929  1.0
  Al  Al2  1  0.071  0.071  0.071  1.0
  Sb  Sb3  1  0.721  0.721  0.721  1.0
  Sb  Sb4  1  0.279  0.279  0.279  1.0
  O  O5  1  0.975  0.571  0.162  1.0
  O  O6  1  0.162  0.975  0.571  1.0
  O  O7  1  0.571  0.162  0.975  1.0
  O  O8  1  0.025  0.838  0.429  1.0
  O  O9  1  0.429  0.025  0.838  1.0
  O  O10  1  0.000  0.000  0.000  1.0
  O  O11  1  0.838  0.429  0.025  1.0
[/CIF]
.
The material described by BaAl2Sb2O7 crystallizes in the trigonal R32 space group. Ba(1) is bonded to six equivalent O(1) atoms to form distorted BaO6 pentagonal pyramids that share corners with six equivalent Al(1)O4 tetrahedra. Al(1) is bonded to one O(2) and three equivalent O(1) atoms to form AlO4 tetrahedra that share corners with three equivalent Ba(1)O6 pentagonal pyramids and  a cornercorner with one Al(1)O4 tetrahedra. Sb(1) is bonded in a distorted T-shaped geometry to three equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ba(1), one Al(1), and one Sb(1) atom. In the second O site, O(2) is bonded in a linear geometry to two equivalent Al(1) atoms. is represented by the CIF file [CIF]
data_BaAl2Sb2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.769
_cell_length_b   8.769
_cell_length_c   8.769
_cell_angle_alpha   36.631
_cell_angle_beta   36.631
_cell_angle_gamma   36.631
_symmetry_Int_Tables_number   1
_cell_volume   214.955
_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
  Ba  Ba0  1  0.500  0.500  0.500  1.0
  Al  Al1  1  0.929  0.929  0.929  1.0
  Al  Al2  1  0.071  0.071  0.071  1.0
  Sb  Sb3  1  0.721  0.721  0.721  1.0
  Sb  Sb4  1  0.279  0.279  0.279  1.0
  O  O5  1  0.975  0.571  0.162  1.0
  O  O6  1  0.162  0.975  0.571  1.0
  O  O7  1  0.571  0.162  0.975  1.0
  O  O8  1  0.025  0.838  0.429  1.0
  O  O9  1  0.429  0.025  0.838  1.0
  O  O10  1  0.000  0.000  0.000  1.0
  O  O11  1  0.838  0.429  0.025  1.0
[/CIF]
.