The structure described by La2Fe2O5 crystallizes in the triclinic P1 space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to one O(1), one O(3), one O(4), one O(5), one O(6), one O(9), and two equivalent O(7) atoms. In the second La site, La(2) is bonded in a 5-coordinate geometry to one O(10), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom. In the third La site, La(3) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), and two equivalent O(9) atoms. In the fourth La site, La(4) is bonded in a 8-coordinate geometry to one O(1), one O(3), one O(4), one O(5), one O(6), one O(8), and two equivalent O(10) atoms. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form FeO6 octahedra that share corners with four equivalent Fe(2)O6 octahedra,  a cornercorner with one Fe(3)O4 tetrahedra, and  a cornercorner with one Fe(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 20-21°. In the second Fe site, Fe(2) is bonded to one O(10), one O(3), one O(4), one O(5), one O(6), and one O(9) atom to form FeO6 octahedra that share corners with four equivalent Fe(1)O6 octahedra,  a cornercorner with one Fe(3)O4 tetrahedra, and  a cornercorner with one Fe(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 20-21°. In the third Fe site, Fe(3) is bonded to one O(1), one O(10), one O(2), and one O(7) atom to form FeO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, and corners with two equivalent Fe(4)O4 tetrahedra. The corner-sharing octahedral tilt angles are 42°. In the fourth Fe site, Fe(4) is bonded to one O(1), one O(2), one O(8), and one O(9) atom to form FeO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, and corners with two equivalent Fe(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 42°. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one La(1), one La(4), one Fe(3), and one Fe(4) atom to form corner-sharing OLa2Fe2 tetrahedra. In the second O site, O(2) is bonded to one La(2), one La(3), one Fe(3), and one Fe(4) atom to form corner-sharing OLa2Fe2 tetrahedra. In the third O site, O(3) is bonded in a 6-coordinate geometry to one La(1), one La(2), one La(3), one La(4), one Fe(1), and one Fe(2) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one La(1), one La(2), one La(3), one La(4), one Fe(1), and one Fe(2) atom. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one La(1), one La(2), one La(3), one La(4), one Fe(1), and one Fe(2) atom. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one La(1), one La(2), one La(3), one La(4), one Fe(1), and one Fe(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one La(3), two equivalent La(1), one Fe(1), and one Fe(3) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one La(2), one La(4), one Fe(1), and one Fe(4) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one La(1), two equivalent La(3), one Fe(2), and one Fe(4) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one La(2), two equivalent La(4), one Fe(2), and one Fe(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_La2Fe2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.561
_cell_length_b   5.907
_cell_length_c   8.900
_cell_angle_alpha   70.562
_cell_angle_beta   71.447
_cell_angle_gamma   89.501
_symmetry_Int_Tables_number   1
_cell_volume   259.808
_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
  La  La0  1  0.383  0.903  0.224  1.0
  La  La1  1  0.603  0.098  0.776  1.0
  La  La2  1  0.881  0.373  0.223  1.0
  La  La3  1  0.105  0.628  0.777  1.0
  Fe  Fe4  1  0.007  0.000  1.000  1.0
  Fe  Fe5  1  0.508  0.500  0.000  1.0
  Fe  Fe6  1  0.726  0.709  0.500  1.0
  Fe  Fe7  1  0.224  0.292  0.500  1.0
  O  O8  1  0.344  0.635  0.500  1.0
  O  O9  1  0.843  0.364  0.500  1.0
  O  O10  1  0.273  0.282  0.954  1.0
  O  O11  1  0.225  0.722  0.045  1.0
  O  O12  1  0.773  0.263  0.954  1.0
  O  O13  1  0.724  0.732  0.046  1.0
  O  O14  1  0.911  0.952  0.280  1.0
  O  O15  1  0.192  0.048  0.720  1.0
  O  O16  1  0.411  0.267  0.280  1.0
  O  O17  1  0.693  0.732  0.720  1.0
[/CIF]
.
The structure described by La2Fe2O5 crystallizes in the triclinic P1 space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to one O(1), one O(3), one O(4), one O(5), one O(6), one O(9), and two equivalent O(7) atoms. In the second La site, La(2) is bonded in a 5-coordinate geometry to one O(10), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom. In the third La site, La(3) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), and two equivalent O(9) atoms. In the fourth La site, La(4) is bonded in a 8-coordinate geometry to one O(1), one O(3), one O(4), one O(5), one O(6), one O(8), and two equivalent O(10) atoms. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form FeO6 octahedra that share corners with four equivalent Fe(2)O6 octahedra,  a cornercorner with one Fe(3)O4 tetrahedra, and  a cornercorner with one Fe(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 20-21°. In the second Fe site, Fe(2) is bonded to one O(10), one O(3), one O(4), one O(5), one O(6), and one O(9) atom to form FeO6 octahedra that share corners with four equivalent Fe(1)O6 octahedra,  a cornercorner with one Fe(3)O4 tetrahedra, and  a cornercorner with one Fe(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 20-21°. In the third Fe site, Fe(3) is bonded to one O(1), one O(10), one O(2), and one O(7) atom to form FeO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, and corners with two equivalent Fe(4)O4 tetrahedra. The corner-sharing octahedral tilt angles are 42°. In the fourth Fe site, Fe(4) is bonded to one O(1), one O(2), one O(8), and one O(9) atom to form FeO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, and corners with two equivalent Fe(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 42°. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one La(1), one La(4), one Fe(3), and one Fe(4) atom to form corner-sharing OLa2Fe2 tetrahedra. In the second O site, O(2) is bonded to one La(2), one La(3), one Fe(3), and one Fe(4) atom to form corner-sharing OLa2Fe2 tetrahedra. In the third O site, O(3) is bonded in a 6-coordinate geometry to one La(1), one La(2), one La(3), one La(4), one Fe(1), and one Fe(2) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one La(1), one La(2), one La(3), one La(4), one Fe(1), and one Fe(2) atom. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one La(1), one La(2), one La(3), one La(4), one Fe(1), and one Fe(2) atom. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one La(1), one La(2), one La(3), one La(4), one Fe(1), and one Fe(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one La(3), two equivalent La(1), one Fe(1), and one Fe(3) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one La(2), one La(4), one Fe(1), and one Fe(4) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one La(1), two equivalent La(3), one Fe(2), and one Fe(4) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one La(2), two equivalent La(4), one Fe(2), and one Fe(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_La2Fe2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.561
_cell_length_b   5.907
_cell_length_c   8.900
_cell_angle_alpha   70.562
_cell_angle_beta   71.447
_cell_angle_gamma   89.501
_symmetry_Int_Tables_number   1
_cell_volume   259.808
_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
  La  La0  1  0.383  0.903  0.224  1.0
  La  La1  1  0.603  0.098  0.776  1.0
  La  La2  1  0.881  0.373  0.223  1.0
  La  La3  1  0.105  0.628  0.777  1.0
  Fe  Fe4  1  0.007  0.000  1.000  1.0
  Fe  Fe5  1  0.508  0.500  0.000  1.0
  Fe  Fe6  1  0.726  0.709  0.500  1.0
  Fe  Fe7  1  0.224  0.292  0.500  1.0
  O  O8  1  0.344  0.635  0.500  1.0
  O  O9  1  0.843  0.364  0.500  1.0
  O  O10  1  0.273  0.282  0.954  1.0
  O  O11  1  0.225  0.722  0.045  1.0
  O  O12  1  0.773  0.263  0.954  1.0
  O  O13  1  0.724  0.732  0.046  1.0
  O  O14  1  0.911  0.952  0.280  1.0
  O  O15  1  0.192  0.048  0.720  1.0
  O  O16  1  0.411  0.267  0.280  1.0
  O  O17  1  0.693  0.732  0.720  1.0
[/CIF]
.