Ti9O10 crystallizes in the triclinic P-1 space group. There are five inequivalent Ti sites. In the first Ti site, Ti(1) is bonded in a 7-coordinate geometry to one O(1), one O(4), two equivalent O(3), and three equivalent O(2) atoms. In the second Ti site, Ti(2) is bonded in a 4-coordinate geometry to one O(1), one O(3), one O(4), and one O(5) atom. In the third Ti site, Ti(3) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. In the fourth Ti site, Ti(4) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(4), and two equivalent O(5) atoms. In the fifth Ti site, Ti(5) is bonded in a 6-coordinate geometry to one O(1), one O(2), two equivalent O(4), and two equivalent O(5) atoms. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ti(1), one Ti(2), one Ti(3), one Ti(4), and one Ti(5) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Ti(3), one Ti(5), and three equivalent Ti(1) atoms. In the third O site, O(3) is bonded to one Ti(2), one Ti(3), and two equivalent Ti(1) atoms to form distorted OTi4 trigonal pyramids that share  a cornercorner with one O(5)Ti5 trigonal bipyramid, corners with three equivalent O(4)Ti5 trigonal bipyramids,  a cornercorner with one O(3)Ti4 trigonal pyramid, and  an edgeedge with one O(3)Ti4 trigonal pyramid. In the fourth O site, O(4) is bonded to one Ti(1), one Ti(2), one Ti(4), and two equivalent Ti(5) atoms to form distorted OTi5 trigonal bipyramids that share corners with two equivalent O(4)Ti5 trigonal bipyramids, corners with three equivalent O(5)Ti5 trigonal bipyramids, corners with three equivalent O(3)Ti4 trigonal pyramids, and edges with two equivalent O(5)Ti5 trigonal bipyramids. In the fifth O site, O(5) is bonded to one Ti(2), two equivalent Ti(4), and two equivalent Ti(5) atoms to form OTi5 trigonal bipyramids that share corners with three equivalent O(4)Ti5 trigonal bipyramids,  a cornercorner with one O(3)Ti4 trigonal pyramid, edges with two equivalent O(4)Ti5 trigonal bipyramids, and edges with two equivalent O(5)Ti5 trigonal bipyramids.
Ti9O10 crystallizes in the triclinic P-1 space group. There are five inequivalent Ti sites. In the first Ti site, Ti(1) is bonded in a 7-coordinate geometry to one O(1), one O(4), two equivalent O(3), and three equivalent O(2) atoms. The Ti(1)-O(1) bond length is 2.11 Å. The Ti(1)-O(4) bond length is 2.07 Å. There is one shorter (2.10 Å) and one longer (2.11 Å) Ti(1)-O(3) bond length. There are a spread of Ti(1)-O(2) bond distances ranging from 2.11-2.53 Å. In the second Ti site, Ti(2) is bonded in a 4-coordinate geometry to one O(1), one O(3), one O(4), and one O(5) atom. The Ti(2)-O(1) bond length is 1.96 Å. The Ti(2)-O(3) bond length is 1.98 Å. The Ti(2)-O(4) bond length is 2.05 Å. The Ti(2)-O(5) bond length is 2.01 Å. In the third Ti site, Ti(3) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Both Ti(3)-O(1) bond lengths are 2.12 Å. Both Ti(3)-O(2) bond lengths are 2.01 Å. Both Ti(3)-O(3) bond lengths are 2.00 Å. In the fourth Ti site, Ti(4) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(4), and two equivalent O(5) atoms. The Ti(4)-O(1) bond length is 2.13 Å. The Ti(4)-O(4) bond length is 2.04 Å. There is one shorter (2.05 Å) and one longer (2.14 Å) Ti(4)-O(5) bond length. In the fifth Ti site, Ti(5) is bonded in a 6-coordinate geometry to one O(1), one O(2), two equivalent O(4), and two equivalent O(5) atoms. The Ti(5)-O(1) bond length is 2.58 Å. The Ti(5)-O(2) bond length is 2.10 Å. There is one shorter (2.25 Å) and one longer (2.34 Å) Ti(5)-O(4) bond length. There is one shorter (2.07 Å) and one longer (2.18 Å) Ti(5)-O(5) bond length. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ti(1), one Ti(2), one Ti(3), one Ti(4), and one Ti(5) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Ti(3), one Ti(5), and three equivalent Ti(1) atoms. In the third O site, O(3) is bonded to one Ti(2), one Ti(3), and two equivalent Ti(1) atoms to form distorted OTi4 trigonal pyramids that share  a cornercorner with one O(5)Ti5 trigonal bipyramid, corners with three equivalent O(4)Ti5 trigonal bipyramids,  a cornercorner with one O(3)Ti4 trigonal pyramid, and  an edgeedge with one O(3)Ti4 trigonal pyramid. In the fourth O site, O(4) is bonded to one Ti(1), one Ti(2), one Ti(4), and two equivalent Ti(5) atoms to form distorted OTi5 trigonal bipyramids that share corners with two equivalent O(4)Ti5 trigonal bipyramids, corners with three equivalent O(5)Ti5 trigonal bipyramids, corners with three equivalent O(3)Ti4 trigonal pyramids, and edges with two equivalent O(5)Ti5 trigonal bipyramids. In the fifth O site, O(5) is bonded to one Ti(2), two equivalent Ti(4), and two equivalent Ti(5) atoms to form OTi5 trigonal bipyramids that share corners with three equivalent O(4)Ti5 trigonal bipyramids,  a cornercorner with one O(3)Ti4 trigonal pyramid, edges with two equivalent O(4)Ti5 trigonal bipyramids, and edges with two equivalent O(5)Ti5 trigonal bipyramids.