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.
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. The La(1)-O(1) bond length is 2.39 Å. The La(1)-O(3) bond length is 2.91 Å. The La(1)-O(4) bond length is 2.54 Å. The La(1)-O(5) bond length is 2.89 Å. The La(1)-O(6) bond length is 2.50 Å. The La(1)-O(9) bond length is 2.39 Å. There is one shorter (2.54 Å) and one longer (3.17 Å) La(1)-O(7) bond length. 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. The La(2)-O(10) bond length is 2.39 Å. The La(2)-O(2) bond length is 2.38 Å. The La(2)-O(3) bond length is 2.52 Å. The La(2)-O(4) bond length is 2.90 Å. The La(2)-O(5) bond length is 2.52 Å. The La(2)-O(6) bond length is 2.90 Å. The La(2)-O(8) bond length is 2.53 Å. 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. The La(3)-O(2) bond length is 2.38 Å. The La(3)-O(3) bond length is 2.88 Å. The La(3)-O(4) bond length is 2.53 Å. The La(3)-O(5) bond length is 2.91 Å. The La(3)-O(6) bond length is 2.52 Å. The La(3)-O(7) bond length is 2.39 Å. There is one shorter (2.54 Å) and one longer (3.17 Å) La(3)-O(9) bond length. 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. The La(4)-O(1) bond length is 2.38 Å. The La(4)-O(3) bond length is 2.51 Å. The La(4)-O(4) bond length is 2.89 Å. The La(4)-O(5) bond length is 2.55 Å. The La(4)-O(6) bond length is 2.89 Å. The La(4)-O(8) bond length is 2.38 Å. There is one shorter (2.53 Å) and one longer (3.17 Å) La(4)-O(10) bond length. 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°. The Fe(1)-O(3) bond length is 2.08 Å. The Fe(1)-O(4) bond length is 2.04 Å. The Fe(1)-O(5) bond length is 2.04 Å. The Fe(1)-O(6) bond length is 2.08 Å. The Fe(1)-O(7) bond length is 2.30 Å. The Fe(1)-O(8) bond length is 2.29 Å. 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°. The Fe(2)-O(10) bond length is 2.30 Å. The Fe(2)-O(3) bond length is 2.06 Å. The Fe(2)-O(4) bond length is 2.07 Å. The Fe(2)-O(5) bond length is 2.06 Å. The Fe(2)-O(6) bond length is 2.05 Å. The Fe(2)-O(9) bond length is 2.30 Å. 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°. The Fe(3)-O(1) bond length is 2.17 Å. The Fe(3)-O(10) bond length is 1.95 Å. The Fe(3)-O(2) bond length is 2.14 Å. The Fe(3)-O(7) bond length is 1.95 Å. 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°. The Fe(4)-O(1) bond length is 2.14 Å. The Fe(4)-O(2) bond length is 2.16 Å. The Fe(4)-O(8) bond length is 1.96 Å. The Fe(4)-O(9) bond length is 1.95 Å. 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.