The crystal structure described by Fe2Al2Bi2O9 crystallizes in the orthorhombic Pbam space group. Fe(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form FeO6 octahedra that share corners with four equivalent Al(1)O4 tetrahedra and edges with two equivalent Fe(1)O6 octahedra. Al(1) is bonded to one O(3), one O(4), and two equivalent O(1) atoms to form AlO4 tetrahedra that share corners with four equivalent Fe(1)O6 octahedra and  a cornercorner with one Al(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-58°. Bi(1) is bonded in a 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 distorted trigonal planar geometry to one Fe(1), one Al(1), and one Bi(1) atom. In the second O site, O(2) is bonded to two equivalent Fe(1) and two equivalent Bi(1) atoms to form a mixture of distorted corner and edge-sharing OFe2Bi2 tetrahedra. In the third O site, O(3) is bonded in a linear geometry to two equivalent Al(1) atoms. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to two equivalent Fe(1) and one Al(1) atom. is represented by the CIF card [CIF]
data_Al2Fe2Bi2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.975
_cell_length_b   7.952
_cell_length_c   8.446
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   401.319
_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  0.500  0.857  0.158  1.0
  Al  Al1  1  0.500  0.143  0.842  1.0
  Al  Al2  1  0.500  0.357  0.342  1.0
  Al  Al3  1  0.500  0.643  0.658  1.0
  Fe  Fe4  1  0.263  0.000  0.500  1.0
  Fe  Fe5  1  0.737  0.500  0.000  1.0
  Fe  Fe6  1  0.737  0.000  0.500  1.0
  Fe  Fe7  1  0.263  0.500  0.000  1.0
  Bi  Bi8  1  0.000  0.682  0.320  1.0
  Bi  Bi9  1  0.000  0.318  0.680  1.0
  Bi  Bi10  1  0.000  0.182  0.180  1.0
  Bi  Bi11  1  0.000  0.818  0.820  1.0
  O  O12  1  0.253  0.876  0.283  1.0
  O  O13  1  0.253  0.124  0.717  1.0
  O  O14  1  0.747  0.376  0.217  1.0
  O  O15  1  0.747  0.624  0.783  1.0
  O  O16  1  0.747  0.124  0.717  1.0
  O  O17  1  0.747  0.876  0.283  1.0
  O  O18  1  0.253  0.624  0.783  1.0
  O  O19  1  0.253  0.376  0.217  1.0
  O  O20  1  0.000  0.654  0.059  1.0
  O  O21  1  0.000  0.346  0.941  1.0
  O  O22  1  0.000  0.154  0.441  1.0
  O  O23  1  0.000  0.846  0.559  1.0
  O  O24  1  0.500  0.500  0.500  1.0
  O  O25  1  0.500  0.000  0.000  1.0
  O  O26  1  0.500  0.646  0.089  1.0
  O  O27  1  0.500  0.354  0.911  1.0
  O  O28  1  0.500  0.146  0.411  1.0
  O  O29  1  0.500  0.854  0.589  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 two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form FeO6 octahedra that share corners with four equivalent Al(1)O4 tetrahedra and edges with two equivalent Fe(1)O6 octahedra. Al(1) is bonded to one O(3), one O(4), and two equivalent O(1) atoms to form AlO4 tetrahedra that share corners with four equivalent Fe(1)O6 octahedra and  a cornercorner with one Al(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-58°. Bi(1) is bonded in a 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 distorted trigonal planar geometry to one Fe(1), one Al(1), and one Bi(1) atom. In the second O site, O(2) is bonded to two equivalent Fe(1) and two equivalent Bi(1) atoms to form a mixture of distorted corner and edge-sharing OFe2Bi2 tetrahedra. In the third O site, O(3) is bonded in a linear geometry to two equivalent Al(1) atoms. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to two equivalent Fe(1) and one Al(1) atom. is represented by the CIF card [CIF]
data_Al2Fe2Bi2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.975
_cell_length_b   7.952
_cell_length_c   8.446
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   401.319
_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  0.500  0.857  0.158  1.0
  Al  Al1  1  0.500  0.143  0.842  1.0
  Al  Al2  1  0.500  0.357  0.342  1.0
  Al  Al3  1  0.500  0.643  0.658  1.0
  Fe  Fe4  1  0.263  0.000  0.500  1.0
  Fe  Fe5  1  0.737  0.500  0.000  1.0
  Fe  Fe6  1  0.737  0.000  0.500  1.0
  Fe  Fe7  1  0.263  0.500  0.000  1.0
  Bi  Bi8  1  0.000  0.682  0.320  1.0
  Bi  Bi9  1  0.000  0.318  0.680  1.0
  Bi  Bi10  1  0.000  0.182  0.180  1.0
  Bi  Bi11  1  0.000  0.818  0.820  1.0
  O  O12  1  0.253  0.876  0.283  1.0
  O  O13  1  0.253  0.124  0.717  1.0
  O  O14  1  0.747  0.376  0.217  1.0
  O  O15  1  0.747  0.624  0.783  1.0
  O  O16  1  0.747  0.124  0.717  1.0
  O  O17  1  0.747  0.876  0.283  1.0
  O  O18  1  0.253  0.624  0.783  1.0
  O  O19  1  0.253  0.376  0.217  1.0
  O  O20  1  0.000  0.654  0.059  1.0
  O  O21  1  0.000  0.346  0.941  1.0
  O  O22  1  0.000  0.154  0.441  1.0
  O  O23  1  0.000  0.846  0.559  1.0
  O  O24  1  0.500  0.500  0.500  1.0
  O  O25  1  0.500  0.000  0.000  1.0
  O  O26  1  0.500  0.646  0.089  1.0
  O  O27  1  0.500  0.354  0.911  1.0
  O  O28  1  0.500  0.146  0.411  1.0
  O  O29  1  0.500  0.854  0.589  1.0
[/CIF]
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