Fe10O11 crystallizes in the triclinic P-1 space group. There are five inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 4-coordinate geometry to one O(1), one O(3), one O(4), one O(5), and two equivalent O(2) atoms. In the second Fe site, Fe(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and two equivalent O(6) atoms. In the third Fe site, Fe(3) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(4), one O(6), and two equivalent O(5) atoms. In the fourth Fe site, Fe(4) is bonded in a 2-coordinate geometry to one O(2), one O(3), one O(4), one O(6), and two equivalent O(5) atoms. In the fifth Fe site, Fe(5) is bonded in a 2-coordinate geometry to one O(5), one O(6), two equivalent O(1), and two equivalent O(4) atoms. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Fe(1), one Fe(2), one Fe(3), and two equivalent Fe(5) atoms. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Fe(2), one Fe(3), one Fe(4), and two equivalent Fe(1) atoms. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Fe(1), two equivalent Fe(2), and two equivalent Fe(4) atoms. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Fe(1), one Fe(2), one Fe(3), one Fe(4), and two equivalent Fe(5) atoms. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Fe(1), one Fe(5), two equivalent Fe(3), and two equivalent Fe(4) atoms. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one Fe(3), one Fe(4), one Fe(5), and two equivalent Fe(2) atoms.
Fe10O11 crystallizes in the triclinic P-1 space group. There are five inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 4-coordinate geometry to one O(1), one O(3), one O(4), one O(5), and two equivalent O(2) atoms. The Fe(1)-O(1) bond length is 2.26 Å. The Fe(1)-O(3) bond length is 2.55 Å. The Fe(1)-O(4) bond length is 2.54 Å. The Fe(1)-O(5) bond length is 2.02 Å. There is one shorter (1.99 Å) and one longer (2.24 Å) Fe(1)-O(2) bond length. In the second Fe site, Fe(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and two equivalent O(6) atoms. The Fe(2)-O(1) bond length is 2.41 Å. The Fe(2)-O(2) bond length is 2.36 Å. The Fe(2)-O(3) bond length is 2.32 Å. The Fe(2)-O(4) bond length is 1.80 Å. There is one shorter (1.85 Å) and one longer (2.15 Å) Fe(2)-O(6) bond length. In the third Fe site, Fe(3) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(4), one O(6), and two equivalent O(5) atoms. The Fe(3)-O(1) bond length is 2.20 Å. The Fe(3)-O(2) bond length is 1.83 Å. The Fe(3)-O(4) bond length is 2.10 Å. The Fe(3)-O(6) bond length is 2.50 Å. There is one shorter (2.32 Å) and one longer (2.54 Å) Fe(3)-O(5) bond length. In the fourth Fe site, Fe(4) is bonded in a 2-coordinate geometry to one O(2), one O(3), one O(4), one O(6), and two equivalent O(5) atoms. The Fe(4)-O(2) bond length is 2.56 Å. The Fe(4)-O(3) bond length is 1.96 Å. The Fe(4)-O(4) bond length is 2.32 Å. The Fe(4)-O(6) bond length is 2.41 Å. There is one shorter (1.88 Å) and one longer (2.52 Å) Fe(4)-O(5) bond length. In the fifth Fe site, Fe(5) is bonded in a 2-coordinate geometry to one O(5), one O(6), two equivalent O(1), and two equivalent O(4) atoms. The Fe(5)-O(5) bond length is 2.34 Å. The Fe(5)-O(6) bond length is 1.97 Å. There is one shorter (1.81 Å) and one longer (2.73 Å) Fe(5)-O(1) bond length. There is one shorter (2.34 Å) and one longer (2.49 Å) Fe(5)-O(4) bond length. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Fe(1), one Fe(2), one Fe(3), and two equivalent Fe(5) atoms. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Fe(2), one Fe(3), one Fe(4), and two equivalent Fe(1) atoms. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Fe(1), two equivalent Fe(2), and two equivalent Fe(4) atoms. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Fe(1), one Fe(2), one Fe(3), one Fe(4), and two equivalent Fe(5) atoms. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Fe(1), one Fe(5), two equivalent Fe(3), and two equivalent Fe(4) atoms. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one Fe(3), one Fe(4), one Fe(5), and two equivalent Fe(2) atoms.