The crystal structure described by Fe2Al2Bi2O9 crystallizes in the orthorhombic Pbam space group. Fe(1) is bonded to one O(3), one O(4), and two equivalent O(1) atoms to form FeO4 tetrahedra that share corners with four equivalent Al(1)O6 octahedra and  a cornercorner with one Fe(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-58°. Al(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form AlO6 octahedra that share corners with four equivalent Fe(1)O4 tetrahedra and edges with two equivalent Al(1)O6 octahedra. Bi(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(2) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Fe(1), one Al(1), and one Bi(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Al(1) and two equivalent Bi(1) atoms. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Fe(1) and two equivalent Al(1) atoms. In the fourth O site, O(4) is bonded in a linear geometry to two equivalent Fe(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Al2Fe2Bi2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.884
_cell_length_b   7.997
_cell_length_c   8.438
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   397.019
_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
  Al  Al0  1  0.257  0.000  0.500  1.0
  Al  Al1  1  0.743  0.500  0.000  1.0
  Al  Al2  1  0.743  0.000  0.500  1.0
  Al  Al3  1  0.257  0.500  0.000  1.0
  Fe  Fe4  1  0.500  0.848  0.166  1.0
  Fe  Fe5  1  0.500  0.152  0.834  1.0
  Fe  Fe6  1  0.500  0.348  0.334  1.0
  Fe  Fe7  1  0.500  0.652  0.666  1.0
  Bi  Bi8  1  0.000  0.675  0.331  1.0
  Bi  Bi9  1  0.000  0.325  0.669  1.0
  Bi  Bi10  1  0.000  0.175  0.169  1.0
  Bi  Bi11  1  0.000  0.825  0.831  1.0
  O  O12  1  0.243  0.874  0.303  1.0
  O  O13  1  0.243  0.126  0.697  1.0
  O  O14  1  0.757  0.374  0.197  1.0
  O  O15  1  0.757  0.626  0.803  1.0
  O  O16  1  0.757  0.126  0.697  1.0
  O  O17  1  0.757  0.874  0.303  1.0
  O  O18  1  0.243  0.626  0.803  1.0
  O  O19  1  0.243  0.374  0.197  1.0
  O  O20  1  0.000  0.642  0.070  1.0
  O  O21  1  0.000  0.358  0.930  1.0
  O  O22  1  0.000  0.142  0.430  1.0
  O  O23  1  0.000  0.858  0.570  1.0
  O  O24  1  0.500  0.628  0.087  1.0
  O  O25  1  0.500  0.372  0.913  1.0
  O  O26  1  0.500  0.128  0.413  1.0
  O  O27  1  0.500  0.872  0.587  1.0
  O  O28  1  0.500  0.500  0.500  1.0
  O  O29  1  0.500  0.000  0.000  1.0
[/CIF]
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The crystal structure described by Fe2Al2Bi2O9 crystallizes in the orthorhombic Pbam space group. Fe(1) is bonded to one O(3), one O(4), and two equivalent O(1) atoms to form FeO4 tetrahedra that share corners with four equivalent Al(1)O6 octahedra and  a cornercorner with one Fe(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-58°. Al(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form AlO6 octahedra that share corners with four equivalent Fe(1)O4 tetrahedra and edges with two equivalent Al(1)O6 octahedra. Bi(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(2) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Fe(1), one Al(1), and one Bi(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Al(1) and two equivalent Bi(1) atoms. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Fe(1) and two equivalent Al(1) atoms. In the fourth O site, O(4) is bonded in a linear geometry to two equivalent Fe(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Al2Fe2Bi2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.884
_cell_length_b   7.997
_cell_length_c   8.438
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   397.019
_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
  Al  Al0  1  0.257  0.000  0.500  1.0
  Al  Al1  1  0.743  0.500  0.000  1.0
  Al  Al2  1  0.743  0.000  0.500  1.0
  Al  Al3  1  0.257  0.500  0.000  1.0
  Fe  Fe4  1  0.500  0.848  0.166  1.0
  Fe  Fe5  1  0.500  0.152  0.834  1.0
  Fe  Fe6  1  0.500  0.348  0.334  1.0
  Fe  Fe7  1  0.500  0.652  0.666  1.0
  Bi  Bi8  1  0.000  0.675  0.331  1.0
  Bi  Bi9  1  0.000  0.325  0.669  1.0
  Bi  Bi10  1  0.000  0.175  0.169  1.0
  Bi  Bi11  1  0.000  0.825  0.831  1.0
  O  O12  1  0.243  0.874  0.303  1.0
  O  O13  1  0.243  0.126  0.697  1.0
  O  O14  1  0.757  0.374  0.197  1.0
  O  O15  1  0.757  0.626  0.803  1.0
  O  O16  1  0.757  0.126  0.697  1.0
  O  O17  1  0.757  0.874  0.303  1.0
  O  O18  1  0.243  0.626  0.803  1.0
  O  O19  1  0.243  0.374  0.197  1.0
  O  O20  1  0.000  0.642  0.070  1.0
  O  O21  1  0.000  0.358  0.930  1.0
  O  O22  1  0.000  0.142  0.430  1.0
  O  O23  1  0.000  0.858  0.570  1.0
  O  O24  1  0.500  0.628  0.087  1.0
  O  O25  1  0.500  0.372  0.913  1.0
  O  O26  1  0.500  0.128  0.413  1.0
  O  O27  1  0.500  0.872  0.587  1.0
  O  O28  1  0.500  0.500  0.500  1.0
  O  O29  1  0.500  0.000  0.000  1.0
[/CIF]
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