Ti5Fe7O18 is Ilmenite-like structured and crystallizes in the triclinic P1 space group. There are five inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(13), one O(17), one O(18), one O(3), one O(5), and one O(9) atom to form distorted TiO6 octahedra that share  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(6)O6 octahedra,  a cornercorner with one Fe(7)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, corners with four equivalent Fe(4)O6 octahedra,  an edgeedge with one Ti(5)O6 octahedra, edges with two equivalent Ti(2)O6 octahedra, and  a faceface with one Fe(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-61°. In the second Ti site, Ti(2) is bonded to one O(11), one O(13), one O(18), one O(3), one O(8), and one O(9) atom to form distorted TiO6 octahedra that share  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra, corners with two equivalent Fe(6)O6 octahedra, corners with four equivalent Fe(3)O6 octahedra,  an edgeedge with one Fe(5)O6 octahedra, edges with two equivalent Ti(1)O6 octahedra, and  a faceface with one Fe(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-62°. In the third Ti site, Ti(3) is bonded to one O(1), one O(10), one O(11), one O(12), one O(14), and one O(16) atom to form distorted TiO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Ti(5)O6 octahedra,  a cornercorner with one Fe(5)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, corners with four equivalent Ti(4)O6 octahedra,  an edgeedge with one Fe(7)O6 octahedra, edges with two equivalent Fe(6)O6 octahedra, and  a faceface with one Fe(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-58°. In the fourth Ti site, Ti(4) is bonded to one O(1), one O(10), one O(14), one O(16), one O(2), and one O(6) atom to form distorted TiO6 octahedra that share  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(6)O6 octahedra, corners with two equivalent Fe(7)O6 octahedra, corners with four equivalent Ti(3)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra, edges with two equivalent Fe(5)O6 octahedra, and  a faceface with one Fe(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-64°. In the fifth Ti site, Ti(5) is bonded to one O(12), one O(15), one O(17), one O(4), one O(5), and one O(7) atom to form distorted TiO6 octahedra that share  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(7)O6 octahedra, corners with two equivalent Fe(4)O6 octahedra, corners with four equivalent Fe(2)O6 octahedra,  an edgeedge with one Ti(1)O6 octahedra, edges with two equivalent Fe(1)O6 octahedra, and  a faceface with one Fe(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-63°. There are seven inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(12), one O(14), one O(15), one O(2), one O(4), and one O(7) atom to form FeO6 octahedra that share  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one Fe(6)O6 octahedra, corners with two equivalent Ti(3)O6 octahedra, corners with four equivalent Fe(7)O6 octahedra,  an edgeedge with one Ti(4)O6 octahedra, edges with two equivalent Ti(5)O6 octahedra, and  a faceface with one Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-61°. In the second Fe site, Fe(2) is bonded to one O(15), one O(17), one O(2), one O(3), one O(4), and one O(7) atom to form distorted FeO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Ti(4)O6 octahedra,  a cornercorner with one Fe(1)O6 octahedra, corners with two equivalent Ti(1)O6 octahedra, corners with four equivalent Ti(5)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra, edges with two equivalent Fe(7)O6 octahedra, and  a faceface with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-61°. In the third Fe site, Fe(3) is bonded to one O(13), one O(18), one O(5), one O(6), one O(8), and one O(9) atom to form distorted FeO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(4)O6 octahedra,  a cornercorner with one Ti(5)O6 octahedra, corners with two equivalent Fe(5)O6 octahedra, corners with four equivalent Ti(2)O6 octahedra,  an edgeedge with one Fe(6)O6 octahedra, edges with two equivalent Fe(4)O6 octahedra, and  a faceface with one Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-65°. In the fourth Fe site, Fe(4) is bonded to one O(18), one O(3), one O(5), one O(7), one O(8), and one O(9) atom to form distorted FeO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(5)O6 octahedra, corners with two equivalent Ti(5)O6 octahedra, corners with four equivalent Ti(1)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra, edges with two equivalent Fe(3)O6 octahedra, and  a faceface with one Ti(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-63°. In the fifth Fe site, Fe(5) is bonded to one O(1), one O(10), one O(11), one O(16), one O(6), and one O(8) atom to form distorted FeO6 octahedra that share  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one Fe(7)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra, corners with four equivalent Fe(6)O6 octahedra,  an edgeedge with one Ti(2)O6 octahedra, edges with two equivalent Ti(4)O6 octahedra, and  a faceface with one Ti(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-65°. In the sixth Fe site, Fe(6) is bonded to one O(1), one O(10), one O(11), one O(13), one O(14), and one O(6) atom to form distorted FeO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(4)O6 octahedra,  a cornercorner with one Fe(1)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra, corners with four equivalent Fe(5)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra, edges with two equivalent Ti(3)O6 octahedra, and  a faceface with one Ti(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-64°. In the seventh Fe site, Fe(7) is bonded to one O(12), one O(15), one O(16), one O(17), one O(2), and one O(4) atom to form distorted FeO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(5)O6 octahedra,  a cornercorner with one Fe(5)O6 octahedra, corners with two equivalent Ti(4)O6 octahedra, corners with four equivalent Fe(1)O6 octahedra,  an edgeedge with one Ti(3)O6 octahedra, edges with two equivalent Fe(2)O6 octahedra, and  a faceface with one Ti(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-61°. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded to one Ti(3), one Ti(4), one Fe(5), and one Fe(6) atom to form a mixture of distorted corner and edge-sharing OTi2Fe2 trigonal pyramids. In the second O site, O(2) is bonded to one Ti(4), one Fe(1), one Fe(2), and one Fe(7) atom to form distorted OTiFe3 trigonal pyramids that share  a cornercorner with one O(1)Ti2Fe2 trigonal pyramid,  a cornercorner with one O(15)TiFe3 trigonal pyramid,  a cornercorner with one O(6)TiFe3 trigonal pyramid, and  an edgeedge with one O(15)TiFe3 trigonal pyramid. In the third O site, O(3) is bonded in a distorted see-saw-like geometry to one Ti(1), one Ti(2), one Fe(2), and one Fe(4) atom. In the fourth O site, O(4) is bonded in a distorted see-saw-like geometry to one Ti(5), one Fe(1), one Fe(2), and one Fe(7) atom. In the fifth O site, O(5) is bonded in a distorted see-saw-like geometry to one Ti(1), one Ti(5), one Fe(3), and one Fe(4) atom. In the sixth O site, O(6) is bonded to one Ti(4), one Fe(3), one Fe(5), and one Fe(6) atom to form distorted OTiFe3 trigonal pyramids that share  a cornercorner with one O(1)Ti2Fe2 trigonal pyramid,  a cornercorner with one O(2)TiFe3 trigonal pyramid, corners with two equivalent O(8)TiFe3 trigonal pyramids, and  an edgeedge with one O(1)Ti2Fe2 trigonal pyramid. In the seventh O site, O(7) is bonded in a distorted see-saw-like geometry to one Ti(5), one Fe(1), one Fe(2), and one Fe(4) atom. In the eighth O site, O(8) is bonded to one Ti(2), one Fe(3), one Fe(4), and one Fe(5) atom to form distorted OTiFe3 trigonal pyramids that share  a cornercorner with one O(1)Ti2Fe2 trigonal pyramid and corners with two equivalent O(6)TiFe3 trigonal pyramids. In the ninth O site, O(9) is bonded in a distorted see-saw-like geometry to one Ti(1), one Ti(2), one Fe(3), and one Fe(4) atom. In the tenth O site, O(10) is bonded in a distorted see-saw-like geometry to one Ti(3), one Ti(4), one Fe(5), and one Fe(6) atom. In the eleventh O site, O(11) is bonded in a distorted see-saw-like geometry to one Ti(2), one Ti(3), one Fe(5), and one Fe(6) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Ti(3), one Ti(5), one Fe(1), and one Fe(7) atom. In the thirteenth O site, O(13) is bonded in a distorted see-saw-like geometry to one Ti(1), one Ti(2), one Fe(3), and one Fe(6) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Ti(3), one Ti(4), one Fe(1), and one Fe(6) atom. In the fifteenth O site, O(15) is bonded to one Ti(5), one Fe(1), one Fe(2), and one Fe(7) atom to form a mixture of distorted corner and edge-sharing OTiFe3 trigonal pyramids. In the sixteenth O site, O(16) is bonded in a distorted see-saw-like geometry to one Ti(3), one Ti(4), one Fe(5), and one Fe(7) atom. In the seventeenth O site, O(17) is bonded in a distorted see-saw-like geometry to one Ti(1), one Ti(5), one Fe(2), and one Fe(7) atom. In the eighteenth O site, O(18) is bonded in a distorted see-saw-like geometry to one Ti(1), one Ti(2), one Fe(3), and one Fe(4) atom.
Ti5Fe7O18 is Ilmenite-like structured and crystallizes in the triclinic P1 space group. There are five inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(13), one O(17), one O(18), one O(3), one O(5), and one O(9) atom to form distorted TiO6 octahedra that share  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(6)O6 octahedra,  a cornercorner with one Fe(7)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, corners with four equivalent Fe(4)O6 octahedra,  an edgeedge with one Ti(5)O6 octahedra, edges with two equivalent Ti(2)O6 octahedra, and  a faceface with one Fe(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-61°. The Ti(1)-O(13) bond length is 2.14 Å. The Ti(1)-O(17) bond length is 1.87 Å. The Ti(1)-O(18) bond length is 2.13 Å. The Ti(1)-O(3) bond length is 1.89 Å. The Ti(1)-O(5) bond length is 2.13 Å. The Ti(1)-O(9) bond length is 1.87 Å. In the second Ti site, Ti(2) is bonded to one O(11), one O(13), one O(18), one O(3), one O(8), and one O(9) atom to form distorted TiO6 octahedra that share  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra, corners with two equivalent Fe(6)O6 octahedra, corners with four equivalent Fe(3)O6 octahedra,  an edgeedge with one Fe(5)O6 octahedra, edges with two equivalent Ti(1)O6 octahedra, and  a faceface with one Fe(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-62°. The Ti(2)-O(11) bond length is 1.94 Å. The Ti(2)-O(13) bond length is 1.85 Å. The Ti(2)-O(18) bond length is 1.93 Å. The Ti(2)-O(3) bond length is 2.10 Å. The Ti(2)-O(8) bond length is 2.06 Å. The Ti(2)-O(9) bond length is 2.12 Å. In the third Ti site, Ti(3) is bonded to one O(1), one O(10), one O(11), one O(12), one O(14), and one O(16) atom to form distorted TiO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Ti(5)O6 octahedra,  a cornercorner with one Fe(5)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, corners with four equivalent Ti(4)O6 octahedra,  an edgeedge with one Fe(7)O6 octahedra, edges with two equivalent Fe(6)O6 octahedra, and  a faceface with one Fe(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-58°. The Ti(3)-O(1) bond length is 1.89 Å. The Ti(3)-O(10) bond length is 2.20 Å. The Ti(3)-O(11) bond length is 2.20 Å. The Ti(3)-O(12) bond length is 1.87 Å. The Ti(3)-O(14) bond length is 1.87 Å. The Ti(3)-O(16) bond length is 2.14 Å. In the fourth Ti site, Ti(4) is bonded to one O(1), one O(10), one O(14), one O(16), one O(2), and one O(6) atom to form distorted TiO6 octahedra that share  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(6)O6 octahedra, corners with two equivalent Fe(7)O6 octahedra, corners with four equivalent Ti(3)O6 octahedra,  an edgeedge with one Fe(1)O6 octahedra, edges with two equivalent Fe(5)O6 octahedra, and  a faceface with one Fe(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-64°. The Ti(4)-O(1) bond length is 2.26 Å. The Ti(4)-O(10) bond length is 1.88 Å. The Ti(4)-O(14) bond length is 2.23 Å. The Ti(4)-O(16) bond length is 1.88 Å. The Ti(4)-O(2) bond length is 1.89 Å. The Ti(4)-O(6) bond length is 2.00 Å. In the fifth Ti site, Ti(5) is bonded to one O(12), one O(15), one O(17), one O(4), one O(5), and one O(7) atom to form distorted TiO6 octahedra that share  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(7)O6 octahedra, corners with two equivalent Fe(4)O6 octahedra, corners with four equivalent Fe(2)O6 octahedra,  an edgeedge with one Ti(1)O6 octahedra, edges with two equivalent Fe(1)O6 octahedra, and  a faceface with one Fe(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-63°. The Ti(5)-O(12) bond length is 2.32 Å. The Ti(5)-O(15) bond length is 1.88 Å. The Ti(5)-O(17) bond length is 2.09 Å. The Ti(5)-O(4) bond length is 2.06 Å. The Ti(5)-O(5) bond length is 1.84 Å. The Ti(5)-O(7) bond length is 1.92 Å. There are seven inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(12), one O(14), one O(15), one O(2), one O(4), and one O(7) atom to form FeO6 octahedra that share  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one Fe(6)O6 octahedra, corners with two equivalent Ti(3)O6 octahedra, corners with four equivalent Fe(7)O6 octahedra,  an edgeedge with one Ti(4)O6 octahedra, edges with two equivalent Ti(5)O6 octahedra, and  a faceface with one Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-61°. The Fe(1)-O(12) bond length is 2.04 Å. The Fe(1)-O(14) bond length is 2.06 Å. The Fe(1)-O(15) bond length is 2.08 Å. The Fe(1)-O(2) bond length is 2.09 Å. The Fe(1)-O(4) bond length is 1.97 Å. The Fe(1)-O(7) bond length is 2.06 Å. In the second Fe site, Fe(2) is bonded to one O(15), one O(17), one O(2), one O(3), one O(4), and one O(7) atom to form distorted FeO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Ti(4)O6 octahedra,  a cornercorner with one Fe(1)O6 octahedra, corners with two equivalent Ti(1)O6 octahedra, corners with four equivalent Ti(5)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra, edges with two equivalent Fe(7)O6 octahedra, and  a faceface with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-61°. The Fe(2)-O(15) bond length is 2.21 Å. The Fe(2)-O(17) bond length is 2.11 Å. The Fe(2)-O(2) bond length is 2.26 Å. The Fe(2)-O(3) bond length is 2.14 Å. The Fe(2)-O(4) bond length is 2.05 Å. The Fe(2)-O(7) bond length is 2.24 Å. In the third Fe site, Fe(3) is bonded to one O(13), one O(18), one O(5), one O(6), one O(8), and one O(9) atom to form distorted FeO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(4)O6 octahedra,  a cornercorner with one Ti(5)O6 octahedra, corners with two equivalent Fe(5)O6 octahedra, corners with four equivalent Ti(2)O6 octahedra,  an edgeedge with one Fe(6)O6 octahedra, edges with two equivalent Fe(4)O6 octahedra, and  a faceface with one Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-65°. The Fe(3)-O(13) bond length is 2.22 Å. The Fe(3)-O(18) bond length is 2.21 Å. The Fe(3)-O(5) bond length is 2.24 Å. The Fe(3)-O(6) bond length is 2.11 Å. The Fe(3)-O(8) bond length is 2.05 Å. The Fe(3)-O(9) bond length is 2.12 Å. In the fourth Fe site, Fe(4) is bonded to one O(18), one O(3), one O(5), one O(7), one O(8), and one O(9) atom to form distorted FeO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(5)O6 octahedra, corners with two equivalent Ti(5)O6 octahedra, corners with four equivalent Ti(1)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra, edges with two equivalent Fe(3)O6 octahedra, and  a faceface with one Ti(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-63°. The Fe(4)-O(18) bond length is 2.09 Å. The Fe(4)-O(3) bond length is 2.25 Å. The Fe(4)-O(5) bond length is 2.12 Å. The Fe(4)-O(7) bond length is 2.15 Å. The Fe(4)-O(8) bond length is 2.21 Å. The Fe(4)-O(9) bond length is 2.22 Å. In the fifth Fe site, Fe(5) is bonded to one O(1), one O(10), one O(11), one O(16), one O(6), and one O(8) atom to form distorted FeO6 octahedra that share  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one Fe(7)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra, corners with four equivalent Fe(6)O6 octahedra,  an edgeedge with one Ti(2)O6 octahedra, edges with two equivalent Ti(4)O6 octahedra, and  a faceface with one Ti(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-65°. The Fe(5)-O(1) bond length is 2.05 Å. The Fe(5)-O(10) bond length is 2.16 Å. The Fe(5)-O(11) bond length is 2.12 Å. The Fe(5)-O(16) bond length is 2.16 Å. The Fe(5)-O(6) bond length is 1.96 Å. The Fe(5)-O(8) bond length is 1.93 Å. In the sixth Fe site, Fe(6) is bonded to one O(1), one O(10), one O(11), one O(13), one O(14), and one O(6) atom to form distorted FeO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(4)O6 octahedra,  a cornercorner with one Fe(1)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra, corners with four equivalent Fe(5)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra, edges with two equivalent Ti(3)O6 octahedra, and  a faceface with one Ti(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-64°. The Fe(6)-O(1) bond length is 2.24 Å. The Fe(6)-O(10) bond length is 2.14 Å. The Fe(6)-O(11) bond length is 2.09 Å. The Fe(6)-O(13) bond length is 2.12 Å. The Fe(6)-O(14) bond length is 2.30 Å. The Fe(6)-O(6) bond length is 2.16 Å. In the seventh Fe site, Fe(7) is bonded to one O(12), one O(15), one O(16), one O(17), one O(2), and one O(4) atom to form distorted FeO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(5)O6 octahedra,  a cornercorner with one Fe(5)O6 octahedra, corners with two equivalent Ti(4)O6 octahedra, corners with four equivalent Fe(1)O6 octahedra,  an edgeedge with one Ti(3)O6 octahedra, edges with two equivalent Fe(2)O6 octahedra, and  a faceface with one Ti(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-61°. The Fe(7)-O(12) bond length is 2.23 Å. The Fe(7)-O(15) bond length is 2.10 Å. The Fe(7)-O(16) bond length is 2.16 Å. The Fe(7)-O(17) bond length is 2.24 Å. The Fe(7)-O(2) bond length is 2.09 Å. The Fe(7)-O(4) bond length is 2.19 Å. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded to one Ti(3), one Ti(4), one Fe(5), and one Fe(6) atom to form a mixture of distorted corner and edge-sharing OTi2Fe2 trigonal pyramids. In the second O site, O(2) is bonded to one Ti(4), one Fe(1), one Fe(2), and one Fe(7) atom to form distorted OTiFe3 trigonal pyramids that share  a cornercorner with one O(1)Ti2Fe2 trigonal pyramid,  a cornercorner with one O(15)TiFe3 trigonal pyramid,  a cornercorner with one O(6)TiFe3 trigonal pyramid, and  an edgeedge with one O(15)TiFe3 trigonal pyramid. In the third O site, O(3) is bonded in a distorted see-saw-like geometry to one Ti(1), one Ti(2), one Fe(2), and one Fe(4) atom. In the fourth O site, O(4) is bonded in a distorted see-saw-like geometry to one Ti(5), one Fe(1), one Fe(2), and one Fe(7) atom. In the fifth O site, O(5) is bonded in a distorted see-saw-like geometry to one Ti(1), one Ti(5), one Fe(3), and one Fe(4) atom. In the sixth O site, O(6) is bonded to one Ti(4), one Fe(3), one Fe(5), and one Fe(6) atom to form distorted OTiFe3 trigonal pyramids that share  a cornercorner with one O(1)Ti2Fe2 trigonal pyramid,  a cornercorner with one O(2)TiFe3 trigonal pyramid, corners with two equivalent O(8)TiFe3 trigonal pyramids, and  an edgeedge with one O(1)Ti2Fe2 trigonal pyramid. In the seventh O site, O(7) is bonded in a distorted see-saw-like geometry to one Ti(5), one Fe(1), one Fe(2), and one Fe(4) atom. In the eighth O site, O(8) is bonded to one Ti(2), one Fe(3), one Fe(4), and one Fe(5) atom to form distorted OTiFe3 trigonal pyramids that share  a cornercorner with one O(1)Ti2Fe2 trigonal pyramid and corners with two equivalent O(6)TiFe3 trigonal pyramids. In the ninth O site, O(9) is bonded in a distorted see-saw-like geometry to one Ti(1), one Ti(2), one Fe(3), and one Fe(4) atom. In the tenth O site, O(10) is bonded in a distorted see-saw-like geometry to one Ti(3), one Ti(4), one Fe(5), and one Fe(6) atom. In the eleventh O site, O(11) is bonded in a distorted see-saw-like geometry to one Ti(2), one Ti(3), one Fe(5), and one Fe(6) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Ti(3), one Ti(5), one Fe(1), and one Fe(7) atom. In the thirteenth O site, O(13) is bonded in a distorted see-saw-like geometry to one Ti(1), one Ti(2), one Fe(3), and one Fe(6) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Ti(3), one Ti(4), one Fe(1), and one Fe(6) atom. In the fifteenth O site, O(15) is bonded to one Ti(5), one Fe(1), one Fe(2), and one Fe(7) atom to form a mixture of distorted corner and edge-sharing OTiFe3 trigonal pyramids. In the sixteenth O site, O(16) is bonded in a distorted see-saw-like geometry to one Ti(3), one Ti(4), one Fe(5), and one Fe(7) atom. In the seventeenth O site, O(17) is bonded in a distorted see-saw-like geometry to one Ti(1), one Ti(5), one Fe(2), and one Fe(7) atom. In the eighteenth O site, O(18) is bonded in a distorted see-saw-like geometry to one Ti(1), one Ti(2), one Fe(3), and one Fe(4) atom.