The material structure described by FeCrAlO4 is Spinel-derived structured and crystallizes in the orthorhombic Imma space group. Cr(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form CrO6 octahedra that share corners with six equivalent Fe(1)O4 tetrahedra, edges with two equivalent Cr(1)O6 octahedra, and edges with four equivalent Al(1)O6 octahedra. Fe(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form FeO4 tetrahedra that share corners with six equivalent Cr(1)O6 octahedra and corners with six equivalent Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-65°. Al(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form AlO6 octahedra that share corners with six equivalent Fe(1)O4 tetrahedra, edges with two equivalent Al(1)O6 octahedra, and edges with four equivalent Cr(1)O6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Cr(1), one Fe(1), and one Al(1) atom to form a mixture of distorted edge and corner-sharing OAlCr2Fe tetrahedra. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Cr(1), one Fe(1), and two equivalent Al(1) atoms. is represented by the CIF card [CIF]
data_AlCrFeO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.872
_cell_length_b   5.928
_cell_length_c   5.928
_cell_angle_alpha   89.328
_cell_angle_beta   119.728
_cell_angle_gamma   119.728
_symmetry_Int_Tables_number   1
_cell_volume   147.901
_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  0.750  0.375  0.625  1.0
  Al  Al1  1  0.250  0.375  0.625  1.0
  Cr  Cr2  1  0.250  0.875  0.625  1.0
  Cr  Cr3  1  0.750  0.375  0.125  1.0
  Fe  Fe4  1  0.500  0.758  0.242  1.0
  Fe  Fe5  1  1.000  0.992  0.008  1.0
  O  O6  1  0.272  0.145  0.854  1.0
  O  O7  1  0.728  0.146  0.855  1.0
  O  O8  1  0.228  0.605  0.396  1.0
  O  O9  1  0.772  0.604  0.395  1.0
  O  O10  1  0.713  0.581  0.845  1.0
  O  O11  1  0.287  0.155  0.419  1.0
  O  O12  1  0.787  0.169  0.405  1.0
  O  O13  1  0.213  0.595  0.831  1.0
[/CIF]
.
The material structure described by FeCrAlO4 is Spinel-derived structured and crystallizes in the orthorhombic Imma space group. Cr(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form CrO6 octahedra that share corners with six equivalent Fe(1)O4 tetrahedra, edges with two equivalent Cr(1)O6 octahedra, and edges with four equivalent Al(1)O6 octahedra. Fe(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form FeO4 tetrahedra that share corners with six equivalent Cr(1)O6 octahedra and corners with six equivalent Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-65°. Al(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form AlO6 octahedra that share corners with six equivalent Fe(1)O4 tetrahedra, edges with two equivalent Al(1)O6 octahedra, and edges with four equivalent Cr(1)O6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Cr(1), one Fe(1), and one Al(1) atom to form a mixture of distorted edge and corner-sharing OAlCr2Fe tetrahedra. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Cr(1), one Fe(1), and two equivalent Al(1) atoms. is represented by the CIF card [CIF]
data_AlCrFeO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.872
_cell_length_b   5.928
_cell_length_c   5.928
_cell_angle_alpha   89.328
_cell_angle_beta   119.728
_cell_angle_gamma   119.728
_symmetry_Int_Tables_number   1
_cell_volume   147.901
_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  0.750  0.375  0.625  1.0
  Al  Al1  1  0.250  0.375  0.625  1.0
  Cr  Cr2  1  0.250  0.875  0.625  1.0
  Cr  Cr3  1  0.750  0.375  0.125  1.0
  Fe  Fe4  1  0.500  0.758  0.242  1.0
  Fe  Fe5  1  1.000  0.992  0.008  1.0
  O  O6  1  0.272  0.145  0.854  1.0
  O  O7  1  0.728  0.146  0.855  1.0
  O  O8  1  0.228  0.605  0.396  1.0
  O  O9  1  0.772  0.604  0.395  1.0
  O  O10  1  0.713  0.581  0.845  1.0
  O  O11  1  0.287  0.155  0.419  1.0
  O  O12  1  0.787  0.169  0.405  1.0
  O  O13  1  0.213  0.595  0.831  1.0
[/CIF]
.