Sr2La2FeCu3O10 crystallizes in the orthorhombic Pbam space group. Sr(1) is bonded in a 10-coordinate geometry to one O(4), one O(6), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. La(1) is bonded in a 10-coordinate geometry to one O(4), one O(6), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. 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 two equivalent Fe(1)O6 octahedra and corners with four equivalent Cu(2)O5 square pyramids. The corner-sharing octahedra are not tilted. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to two equivalent O(3) and two equivalent O(6) atoms. In the second Cu site, Cu(2) is bonded to one O(1), one O(2), one O(3), and two equivalent O(5) atoms to form CuO5 square pyramids that share corners with two equivalent Fe(1)O6 octahedra and corners with two equivalent Cu(2)O5 square pyramids. The corner-sharing octahedral tilt angles range from 14-25°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent La(1), one Fe(1), and one Cu(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent La(1), one Fe(1), and one Cu(2) atom. In the third O site, O(3) is bonded to two equivalent Sr(1), two equivalent La(1), one Cu(1), and one Cu(2) atom to form distorted OSr2La2Cu2 octahedra that share  a cornercorner with one O(3)Sr2La2Cu2 octahedra, corners with four equivalent O(5)Sr2La2Cu2 octahedra, corners with four equivalent O(4)Sr2La2Fe2 octahedra, edges with two equivalent O(3)Sr2La2Cu2 octahedra, faces with two equivalent O(5)Sr2La2Cu2 octahedra, and faces with two equivalent O(6)Sr2La2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-71°. In the fourth O site, O(4) is bonded to two equivalent Sr(1), two equivalent La(1), and two equivalent Fe(1) atoms to form OSr2La2Fe2 octahedra that share corners with two equivalent O(4)Sr2La2Fe2 octahedra, corners with four equivalent O(6)Sr2La2Cu2 octahedra, corners with eight equivalent O(3)Sr2La2Cu2 octahedra, and edges with four equivalent O(5)Sr2La2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-56°. In the fifth O site, O(5) is bonded to two equivalent Sr(1), two equivalent La(1), and two equivalent Cu(2) atoms to form distorted OSr2La2Cu2 octahedra that share corners with four equivalent O(3)Sr2La2Cu2 octahedra, corners with six equivalent O(5)Sr2La2Cu2 octahedra, edges with two equivalent O(6)Sr2La2Cu2 octahedra, edges with two equivalent O(4)Sr2La2Fe2 octahedra, and faces with two equivalent O(3)Sr2La2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-71°. In the sixth O site, O(6) is bonded to two equivalent Sr(1), two equivalent La(1), and two equivalent Cu(1) atoms to form distorted OSr2La2Cu2 octahedra that share corners with two equivalent O(6)Sr2La2Cu2 octahedra, corners with four equivalent O(4)Sr2La2Fe2 octahedra, edges with four equivalent O(5)Sr2La2Cu2 octahedra, and faces with four equivalent O(3)Sr2La2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-13°.
Sr2La2FeCu3O10 crystallizes in the orthorhombic Pbam space group. Sr(1) is bonded in a 10-coordinate geometry to one O(4), one O(6), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. The Sr(1)-O(4) bond length is 2.69 Å. The Sr(1)-O(6) bond length is 2.72 Å. Both Sr(1)-O(1) bond lengths are 2.59 Å. Both Sr(1)-O(2) bond lengths are 3.06 Å. Both Sr(1)-O(3) bond lengths are 2.74 Å. There is one shorter (2.68 Å) and one longer (2.69 Å) Sr(1)-O(5) bond length. La(1) is bonded in a 10-coordinate geometry to one O(4), one O(6), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. The La(1)-O(4) bond length is 2.64 Å. The La(1)-O(6) bond length is 2.75 Å. Both La(1)-O(1) bond lengths are 2.85 Å. Both La(1)-O(2) bond lengths are 2.52 Å. Both La(1)-O(3) bond lengths are 2.59 Å. There is one shorter (2.63 Å) and one longer (2.78 Å) La(1)-O(5) bond length. 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 two equivalent Fe(1)O6 octahedra and corners with four equivalent Cu(2)O5 square pyramids. The corner-sharing octahedra are not tilted. Both Fe(1)-O(1) bond lengths are 1.99 Å. Both Fe(1)-O(2) bond lengths are 2.01 Å. Both Fe(1)-O(4) bond lengths are 2.00 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to two equivalent O(3) and two equivalent O(6) atoms. Both Cu(1)-O(3) bond lengths are 1.86 Å. Both Cu(1)-O(6) bond lengths are 2.00 Å. In the second Cu site, Cu(2) is bonded to one O(1), one O(2), one O(3), and two equivalent O(5) atoms to form CuO5 square pyramids that share corners with two equivalent Fe(1)O6 octahedra and corners with two equivalent Cu(2)O5 square pyramids. The corner-sharing octahedral tilt angles range from 14-25°. The Cu(2)-O(1) bond length is 1.88 Å. The Cu(2)-O(2) bond length is 1.87 Å. The Cu(2)-O(3) bond length is 2.24 Å. Both Cu(2)-O(5) bond lengths are 2.00 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent La(1), one Fe(1), and one Cu(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent La(1), one Fe(1), and one Cu(2) atom. In the third O site, O(3) is bonded to two equivalent Sr(1), two equivalent La(1), one Cu(1), and one Cu(2) atom to form distorted OSr2La2Cu2 octahedra that share  a cornercorner with one O(3)Sr2La2Cu2 octahedra, corners with four equivalent O(5)Sr2La2Cu2 octahedra, corners with four equivalent O(4)Sr2La2Fe2 octahedra, edges with two equivalent O(3)Sr2La2Cu2 octahedra, faces with two equivalent O(5)Sr2La2Cu2 octahedra, and faces with two equivalent O(6)Sr2La2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-71°. In the fourth O site, O(4) is bonded to two equivalent Sr(1), two equivalent La(1), and two equivalent Fe(1) atoms to form OSr2La2Fe2 octahedra that share corners with two equivalent O(4)Sr2La2Fe2 octahedra, corners with four equivalent O(6)Sr2La2Cu2 octahedra, corners with eight equivalent O(3)Sr2La2Cu2 octahedra, and edges with four equivalent O(5)Sr2La2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-56°. In the fifth O site, O(5) is bonded to two equivalent Sr(1), two equivalent La(1), and two equivalent Cu(2) atoms to form distorted OSr2La2Cu2 octahedra that share corners with four equivalent O(3)Sr2La2Cu2 octahedra, corners with six equivalent O(5)Sr2La2Cu2 octahedra, edges with two equivalent O(6)Sr2La2Cu2 octahedra, edges with two equivalent O(4)Sr2La2Fe2 octahedra, and faces with two equivalent O(3)Sr2La2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-71°. In the sixth O site, O(6) is bonded to two equivalent Sr(1), two equivalent La(1), and two equivalent Cu(1) atoms to form distorted OSr2La2Cu2 octahedra that share corners with two equivalent O(6)Sr2La2Cu2 octahedra, corners with four equivalent O(4)Sr2La2Fe2 octahedra, edges with four equivalent O(5)Sr2La2Cu2 octahedra, and faces with four equivalent O(3)Sr2La2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-13°.