MgTi8(NiO3)8 is Ilmenite-derived structured and crystallizes in the triclinic P1 space group. Mg(1) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(13), one O(5), and one O(8) atom. There are eight inequivalent Ti sites. In the first Ti site, Ti(1) is bonded in a 5-coordinate geometry to one O(1), one O(16), one O(2), one O(3), and one O(8) atom. In the second Ti site, Ti(2) is bonded to one O(11), one O(17), one O(18), one O(2), one O(23), and one O(4) atom to form TiO6 octahedra that share  a cornercorner with one Ni(5)O6 octahedra,  a cornercorner with one Ni(6)O6 octahedra,  a cornercorner with one Ni(7)O6 octahedra, corners with two equivalent Ni(8)O6 octahedra,  an edgeedge with one Ti(5)O6 octahedra,  an edgeedge with one Ti(7)O6 octahedra, and  an edgeedge with one Ti(8)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-57°. In the third Ti site, Ti(3) is bonded to one O(1), one O(12), one O(19), one O(20), one O(22), and one O(5) atom to form distorted TiO6 octahedra that share  a cornercorner with one Ni(2)O6 octahedra,  a cornercorner with one Ni(5)O6 octahedra,  a cornercorner with one Ni(6)O6 octahedra,  a cornercorner with one Ni(7)O6 octahedra, corners with two equivalent Ni(8)O6 octahedra,  an edgeedge with one Ti(5)O6 octahedra,  an edgeedge with one Ti(6)O6 octahedra,  an edgeedge with one Ti(8)O6 octahedra, and  a faceface with one Ni(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-59°. In the fourth Ti site, Ti(4) is bonded to one O(10), one O(14), one O(15), one O(21), one O(24), and one O(6) atom to form distorted TiO6 octahedra that share  a cornercorner with one Ni(2)O6 octahedra,  a cornercorner with one Ni(5)O6 octahedra,  a cornercorner with one Ni(8)O6 octahedra, corners with two equivalent Ni(6)O6 octahedra, corners with two equivalent Ni(7)O6 octahedra,  an edgeedge with one Ti(5)O6 octahedra,  an edgeedge with one Ti(6)O6 octahedra,  an edgeedge with one Ti(7)O6 octahedra, and  a faceface with one Ni(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-68°. In the fifth Ti site, Ti(5) is bonded to one O(1), one O(10), one O(11), one O(15), one O(19), and one O(4) atom to form distorted TiO6 octahedra that share  a cornercorner with one Ni(5)O6 octahedra,  a cornercorner with one Ni(6)O6 octahedra,  a cornercorner with one Ni(7)O6 octahedra, corners with two equivalent Ni(2)O6 octahedra,  an edgeedge with one Ti(2)O6 octahedra,  an edgeedge with one Ti(3)O6 octahedra, and  an edgeedge with one Ti(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-62°. In the sixth Ti site, Ti(6) is bonded to one O(13), one O(20), one O(24), one O(3), one O(5), and one O(6) atom to form distorted TiO6 octahedra that share  a cornercorner with one Ni(2)O6 octahedra,  a cornercorner with one Ni(6)O6 octahedra,  a cornercorner with one Ni(8)O6 octahedra, corners with two equivalent Ni(5)O6 octahedra,  an edgeedge with one Ti(3)O6 octahedra,  an edgeedge with one Ti(4)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra, and  a faceface with one Ni(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-62°. In the seventh Ti site, Ti(7) is bonded to one O(14), one O(2), one O(21), one O(23), one O(7), and one O(8) atom to form distorted TiO6 octahedra that share  a cornercorner with one Ni(2)O6 octahedra,  a cornercorner with one Ni(7)O6 octahedra,  a cornercorner with one Ni(8)O6 octahedra, corners with two equivalent Ni(5)O6 octahedra,  an edgeedge with one Ti(2)O6 octahedra,  an edgeedge with one Ti(4)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra, and  a faceface with one Ni(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-65°. In the eighth Ti site, Ti(8) is bonded to one O(12), one O(16), one O(17), one O(18), one O(22), and one O(9) atom to form distorted TiO6 octahedra that share  a cornercorner with one Ni(5)O6 octahedra,  a cornercorner with one Ni(6)O6 octahedra,  a cornercorner with one Ni(7)O6 octahedra,  a cornercorner with one Ni(8)O6 octahedra, corners with two equivalent Ni(2)O6 octahedra,  an edgeedge with one Ti(2)O6 octahedra,  an edgeedge with one Ti(3)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra, and  a faceface with one Ni(8)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-62°. There are eight inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(13), one O(16), one O(3), one O(7), one O(8), and one O(9) atom to form distorted NiO6 octahedra that share  a cornercorner with one Ni(2)O6 octahedra,  a cornercorner with one Ni(8)O6 octahedra, corners with two equivalent Ni(6)O6 octahedra, corners with two equivalent Ni(7)O6 octahedra,  an edgeedge with one Ti(6)O6 octahedra,  an edgeedge with one Ti(7)O6 octahedra, and  an edgeedge with one Ti(8)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-62°. In the second Ni site, Ni(2) is bonded to one O(10), one O(12), one O(19), one O(22), one O(5), and one O(7) atom to form distorted NiO6 octahedra that share  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Ti(4)O6 octahedra,  a cornercorner with one Ti(6)O6 octahedra,  a cornercorner with one Ti(7)O6 octahedra,  a cornercorner with one Ni(1)O6 octahedra, corners with two equivalent Ti(5)O6 octahedra, corners with two equivalent Ti(8)O6 octahedra,  an edgeedge with one Ni(7)O6 octahedra,  an edgeedge with one Ni(8)O6 octahedra, and  a faceface with one Ti(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-68°. In the third Ni site, Ni(3) is bonded in a 5-coordinate geometry to one O(11), one O(18), one O(23), one O(6), and one O(9) atom. In the fourth Ni site, Ni(4) is bonded in a 3-coordinate geometry to one O(10), one O(11), one O(4), and one O(8) atom. In the fifth Ni site, Ni(5) is bonded to one O(14), one O(15), one O(17), one O(20), one O(21), and one O(24) atom to form NiO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Ti(4)O6 octahedra,  a cornercorner with one Ti(5)O6 octahedra,  a cornercorner with one Ti(8)O6 octahedra, corners with two equivalent Ti(6)O6 octahedra, corners with two equivalent Ti(7)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra,  an edgeedge with one Ni(7)O6 octahedra,  an edgeedge with one Ni(8)O6 octahedra, and  a faceface with one Ti(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-59°. In the sixth Ni site, Ni(6) is bonded to one O(13), one O(15), one O(18), one O(20), one O(3), and one O(6) atom to form distorted NiO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Ti(5)O6 octahedra,  a cornercorner with one Ti(6)O6 octahedra,  a cornercorner with one Ti(8)O6 octahedra, corners with two equivalent Ti(4)O6 octahedra, corners with two equivalent Ni(1)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra, and  a faceface with one Ti(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-62°. In the seventh Ni site, Ni(7) is bonded to one O(14), one O(16), one O(19), one O(2), one O(21), and one O(7) atom to form NiO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Ti(5)O6 octahedra,  a cornercorner with one Ti(7)O6 octahedra,  a cornercorner with one Ti(8)O6 octahedra, corners with two equivalent Ti(4)O6 octahedra, corners with two equivalent Ni(1)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra, and  a faceface with one Ti(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-62°. In the eighth Ni site, Ni(8) is bonded to one O(12), one O(17), one O(22), one O(23), one O(24), and one O(9) atom to form distorted NiO6 octahedra that share  a cornercorner with one Ti(4)O6 octahedra,  a cornercorner with one Ti(6)O6 octahedra,  a cornercorner with one Ti(7)O6 octahedra,  a cornercorner with one Ti(8)O6 octahedra,  a cornercorner with one Ni(1)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra, corners with two equivalent Ti(3)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra, and  a faceface with one Ti(8)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-65°. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one Ti(1), one Ti(3), and one Ti(5) atom to form a mixture of distorted corner and edge-sharing OMgTi3 tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ti(1), one Ti(2), one Ti(7), and one Ni(7) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ti(1), one Ti(6), one Ni(1), and one Ni(6) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Ti(2), one Ti(5), and one Ni(4) atom. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Ti(3), one Ti(6), and one Ni(2) atom. In the sixth O site, O(6) is bonded to one Ti(4), one Ti(6), one Ni(3), and one Ni(6) atom to form a mixture of distorted corner and edge-sharing OTi2Ni2 trigonal pyramids. In the seventh O site, O(7) is bonded to one Ti(7), one Ni(1), one Ni(2), and one Ni(7) atom to form a mixture of distorted corner and edge-sharing OTiNi3 trigonal pyramids. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Mg(1), one Ti(1), one Ti(7), one Ni(1), and one Ni(4) atom. In the ninth O site, O(9) is bonded in a distorted see-saw-like geometry to one Ti(8), one Ni(1), one Ni(3), and one Ni(8) atom. In the tenth O site, O(10) is bonded to one Ti(4), one Ti(5), one Ni(2), and one Ni(4) atom to form distorted OTi2Ni2 tetrahedra that share  a cornercorner with one O(1)MgTi3 tetrahedra,  a cornercorner with one O(21)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(24)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(6)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(7)TiNi3 trigonal pyramid, corners with two equivalent O(19)Ti2Ni2 trigonal pyramids, and  an edgeedge with one O(15)Ti2Ni2 trigonal pyramid. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Ti(2), one Ti(5), one Ni(3), and one Ni(4) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Ti(3), one Ti(8), one Ni(2), and one Ni(8) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Mg(1), one Ti(6), one Ni(1), and one Ni(6) atom. In the fourteenth O site, O(14) is bonded in a rectangular see-saw-like geometry to one Ti(4), one Ti(7), one Ni(5), and one Ni(7) atom. In the fifteenth O site, O(15) is bonded to one Ti(4), one Ti(5), one Ni(5), and one Ni(6) atom to form distorted OTi2Ni2 trigonal pyramids that share  a cornercorner with one O(1)MgTi3 tetrahedra,  a cornercorner with one O(17)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(18)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(19)Ti2Ni2 trigonal pyramid, corners with two equivalent O(21)Ti2Ni2 trigonal pyramids, corners with two equivalent O(6)Ti2Ni2 trigonal pyramids,  an edgeedge with one O(10)Ti2Ni2 tetrahedra, and  an edgeedge with one O(24)Ti2Ni2 trigonal pyramid. In the sixteenth O site, O(16) is bonded in a distorted see-saw-like geometry to one Ti(1), one Ti(8), one Ni(1), and one Ni(7) atom. In the seventeenth O site, O(17) is bonded to one Ti(2), one Ti(8), one Ni(5), and one Ni(8) atom to form a mixture of distorted corner and edge-sharing OTi2Ni2 trigonal pyramids. In the eighteenth O site, O(18) is bonded to one Ti(2), one Ti(8), one Ni(3), and one Ni(6) atom to form a mixture of distorted corner and edge-sharing OTi2Ni2 trigonal pyramids. In the nineteenth O site, O(19) is bonded to one Ti(3), one Ti(5), one Ni(2), and one Ni(7) atom to form distorted OTi2Ni2 trigonal pyramids that share corners with two equivalent O(10)Ti2Ni2 tetrahedra,  a cornercorner with one O(15)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(21)Ti2Ni2 trigonal pyramid,  an edgeedge with one O(1)MgTi3 tetrahedra, and  an edgeedge with one O(7)TiNi3 trigonal pyramid. In the twentieth O site, O(20) is bonded in a distorted see-saw-like geometry to one Ti(3), one Ti(6), one Ni(5), and one Ni(6) atom. In the twenty-first O site, O(21) is bonded to one Ti(4), one Ti(7), one Ni(5), and one Ni(7) atom to form distorted OTi2Ni2 trigonal pyramids that share  a cornercorner with one O(10)Ti2Ni2 tetrahedra,  a cornercorner with one O(17)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(19)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(6)Ti2Ni2 trigonal pyramid, corners with two equivalent O(15)Ti2Ni2 trigonal pyramids, corners with two equivalent O(24)Ti2Ni2 trigonal pyramids, and  an edgeedge with one O(7)TiNi3 trigonal pyramid. In the twenty-second O site, O(22) is bonded in a 4-coordinate geometry to one Ti(3), one Ti(8), one Ni(2), and one Ni(8) atom. In the twenty-third O site, O(23) is bonded in a 4-coordinate geometry to one Ti(2), one Ti(7), one Ni(3), and one Ni(8) atom. In the twenty-fourth O site, O(24) is bonded to one Ti(4), one Ti(6), one Ni(5), and one Ni(8) atom to form a mixture of distorted corner and edge-sharing OTi2Ni2 trigonal pyramids.
MgTi8(NiO3)8 is Ilmenite-derived structured and crystallizes in the triclinic P1 space group. Mg(1) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(13), one O(5), and one O(8) atom. The Mg(1)-O(1) bond length is 1.95 Å. The Mg(1)-O(13) bond length is 2.09 Å. The Mg(1)-O(5) bond length is 1.88 Å. The Mg(1)-O(8) bond length is 1.96 Å. There are eight inequivalent Ti sites. In the first Ti site, Ti(1) is bonded in a 5-coordinate geometry to one O(1), one O(16), one O(2), one O(3), and one O(8) atom. The Ti(1)-O(1) bond length is 2.02 Å. The Ti(1)-O(16) bond length is 1.98 Å. The Ti(1)-O(2) bond length is 1.84 Å. The Ti(1)-O(3) bond length is 1.84 Å. The Ti(1)-O(8) bond length is 2.13 Å. In the second Ti site, Ti(2) is bonded to one O(11), one O(17), one O(18), one O(2), one O(23), and one O(4) atom to form TiO6 octahedra that share  a cornercorner with one Ni(5)O6 octahedra,  a cornercorner with one Ni(6)O6 octahedra,  a cornercorner with one Ni(7)O6 octahedra, corners with two equivalent Ni(8)O6 octahedra,  an edgeedge with one Ti(5)O6 octahedra,  an edgeedge with one Ti(7)O6 octahedra, and  an edgeedge with one Ti(8)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-57°. The Ti(2)-O(11) bond length is 1.85 Å. The Ti(2)-O(17) bond length is 1.87 Å. The Ti(2)-O(18) bond length is 2.00 Å. The Ti(2)-O(2) bond length is 2.08 Å. The Ti(2)-O(23) bond length is 2.11 Å. The Ti(2)-O(4) bond length is 2.06 Å. In the third Ti site, Ti(3) is bonded to one O(1), one O(12), one O(19), one O(20), one O(22), and one O(5) atom to form distorted TiO6 octahedra that share  a cornercorner with one Ni(2)O6 octahedra,  a cornercorner with one Ni(5)O6 octahedra,  a cornercorner with one Ni(6)O6 octahedra,  a cornercorner with one Ni(7)O6 octahedra, corners with two equivalent Ni(8)O6 octahedra,  an edgeedge with one Ti(5)O6 octahedra,  an edgeedge with one Ti(6)O6 octahedra,  an edgeedge with one Ti(8)O6 octahedra, and  a faceface with one Ni(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-59°. The Ti(3)-O(1) bond length is 2.04 Å. The Ti(3)-O(12) bond length is 1.90 Å. The Ti(3)-O(19) bond length is 2.17 Å. The Ti(3)-O(20) bond length is 1.88 Å. The Ti(3)-O(22) bond length is 1.96 Å. The Ti(3)-O(5) bond length is 2.00 Å. In the fourth Ti site, Ti(4) is bonded to one O(10), one O(14), one O(15), one O(21), one O(24), and one O(6) atom to form distorted TiO6 octahedra that share  a cornercorner with one Ni(2)O6 octahedra,  a cornercorner with one Ni(5)O6 octahedra,  a cornercorner with one Ni(8)O6 octahedra, corners with two equivalent Ni(6)O6 octahedra, corners with two equivalent Ni(7)O6 octahedra,  an edgeedge with one Ti(5)O6 octahedra,  an edgeedge with one Ti(6)O6 octahedra,  an edgeedge with one Ti(7)O6 octahedra, and  a faceface with one Ni(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-68°. The Ti(4)-O(10) bond length is 1.91 Å. The Ti(4)-O(14) bond length is 2.01 Å. The Ti(4)-O(15) bond length is 2.24 Å. The Ti(4)-O(21) bond length is 1.91 Å. The Ti(4)-O(24) bond length is 2.10 Å. The Ti(4)-O(6) bond length is 2.07 Å. In the fifth Ti site, Ti(5) is bonded to one O(1), one O(10), one O(11), one O(15), one O(19), and one O(4) atom to form distorted TiO6 octahedra that share  a cornercorner with one Ni(5)O6 octahedra,  a cornercorner with one Ni(6)O6 octahedra,  a cornercorner with one Ni(7)O6 octahedra, corners with two equivalent Ni(2)O6 octahedra,  an edgeedge with one Ti(2)O6 octahedra,  an edgeedge with one Ti(3)O6 octahedra, and  an edgeedge with one Ti(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-62°. The Ti(5)-O(1) bond length is 2.25 Å. The Ti(5)-O(10) bond length is 2.13 Å. The Ti(5)-O(11) bond length is 2.19 Å. The Ti(5)-O(15) bond length is 1.87 Å. The Ti(5)-O(19) bond length is 1.89 Å. The Ti(5)-O(4) bond length is 1.81 Å. In the sixth Ti site, Ti(6) is bonded to one O(13), one O(20), one O(24), one O(3), one O(5), and one O(6) atom to form distorted TiO6 octahedra that share  a cornercorner with one Ni(2)O6 octahedra,  a cornercorner with one Ni(6)O6 octahedra,  a cornercorner with one Ni(8)O6 octahedra, corners with two equivalent Ni(5)O6 octahedra,  an edgeedge with one Ti(3)O6 octahedra,  an edgeedge with one Ti(4)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra, and  a faceface with one Ni(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-62°. The Ti(6)-O(13) bond length is 1.90 Å. The Ti(6)-O(20) bond length is 2.16 Å. The Ti(6)-O(24) bond length is 1.86 Å. The Ti(6)-O(3) bond length is 2.19 Å. The Ti(6)-O(5) bond length is 1.99 Å. The Ti(6)-O(6) bond length is 1.90 Å. In the seventh Ti site, Ti(7) is bonded to one O(14), one O(2), one O(21), one O(23), one O(7), and one O(8) atom to form distorted TiO6 octahedra that share  a cornercorner with one Ni(2)O6 octahedra,  a cornercorner with one Ni(7)O6 octahedra,  a cornercorner with one Ni(8)O6 octahedra, corners with two equivalent Ni(5)O6 octahedra,  an edgeedge with one Ti(2)O6 octahedra,  an edgeedge with one Ti(4)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra, and  a faceface with one Ni(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-65°. The Ti(7)-O(14) bond length is 1.91 Å. The Ti(7)-O(2) bond length is 2.30 Å. The Ti(7)-O(21) bond length is 2.09 Å. The Ti(7)-O(23) bond length is 1.97 Å. The Ti(7)-O(7) bond length is 1.98 Å. The Ti(7)-O(8) bond length is 2.02 Å. In the eighth Ti site, Ti(8) is bonded to one O(12), one O(16), one O(17), one O(18), one O(22), and one O(9) atom to form distorted TiO6 octahedra that share  a cornercorner with one Ni(5)O6 octahedra,  a cornercorner with one Ni(6)O6 octahedra,  a cornercorner with one Ni(7)O6 octahedra,  a cornercorner with one Ni(8)O6 octahedra, corners with two equivalent Ni(2)O6 octahedra,  an edgeedge with one Ti(2)O6 octahedra,  an edgeedge with one Ti(3)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra, and  a faceface with one Ni(8)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-62°. The Ti(8)-O(12) bond length is 2.04 Å. The Ti(8)-O(16) bond length is 1.88 Å. The Ti(8)-O(17) bond length is 2.21 Å. The Ti(8)-O(18) bond length is 1.96 Å. The Ti(8)-O(22) bond length is 1.95 Å. The Ti(8)-O(9) bond length is 1.97 Å. There are eight inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(13), one O(16), one O(3), one O(7), one O(8), and one O(9) atom to form distorted NiO6 octahedra that share  a cornercorner with one Ni(2)O6 octahedra,  a cornercorner with one Ni(8)O6 octahedra, corners with two equivalent Ni(6)O6 octahedra, corners with two equivalent Ni(7)O6 octahedra,  an edgeedge with one Ti(6)O6 octahedra,  an edgeedge with one Ti(7)O6 octahedra, and  an edgeedge with one Ti(8)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-62°. The Ni(1)-O(13) bond length is 2.14 Å. The Ni(1)-O(16) bond length is 2.30 Å. The Ni(1)-O(3) bond length is 2.13 Å. The Ni(1)-O(7) bond length is 2.00 Å. The Ni(1)-O(8) bond length is 2.13 Å. The Ni(1)-O(9) bond length is 1.99 Å. In the second Ni site, Ni(2) is bonded to one O(10), one O(12), one O(19), one O(22), one O(5), and one O(7) atom to form distorted NiO6 octahedra that share  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Ti(4)O6 octahedra,  a cornercorner with one Ti(6)O6 octahedra,  a cornercorner with one Ti(7)O6 octahedra,  a cornercorner with one Ni(1)O6 octahedra, corners with two equivalent Ti(5)O6 octahedra, corners with two equivalent Ti(8)O6 octahedra,  an edgeedge with one Ni(7)O6 octahedra,  an edgeedge with one Ni(8)O6 octahedra, and  a faceface with one Ti(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-68°. The Ni(2)-O(10) bond length is 2.17 Å. The Ni(2)-O(12) bond length is 2.07 Å. The Ni(2)-O(19) bond length is 2.13 Å. The Ni(2)-O(22) bond length is 2.43 Å. The Ni(2)-O(5) bond length is 2.10 Å. The Ni(2)-O(7) bond length is 2.00 Å. In the third Ni site, Ni(3) is bonded in a 5-coordinate geometry to one O(11), one O(18), one O(23), one O(6), and one O(9) atom. The Ni(3)-O(11) bond length is 2.16 Å. The Ni(3)-O(18) bond length is 2.12 Å. The Ni(3)-O(23) bond length is 2.20 Å. The Ni(3)-O(6) bond length is 2.04 Å. The Ni(3)-O(9) bond length is 1.95 Å. In the fourth Ni site, Ni(4) is bonded in a 3-coordinate geometry to one O(10), one O(11), one O(4), and one O(8) atom. The Ni(4)-O(10) bond length is 2.07 Å. The Ni(4)-O(11) bond length is 1.89 Å. The Ni(4)-O(4) bond length is 1.84 Å. The Ni(4)-O(8) bond length is 2.44 Å. In the fifth Ni site, Ni(5) is bonded to one O(14), one O(15), one O(17), one O(20), one O(21), and one O(24) atom to form NiO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Ti(4)O6 octahedra,  a cornercorner with one Ti(5)O6 octahedra,  a cornercorner with one Ti(8)O6 octahedra, corners with two equivalent Ti(6)O6 octahedra, corners with two equivalent Ti(7)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra,  an edgeedge with one Ni(7)O6 octahedra,  an edgeedge with one Ni(8)O6 octahedra, and  a faceface with one Ti(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-59°. The Ni(5)-O(14) bond length is 2.20 Å. The Ni(5)-O(15) bond length is 2.09 Å. The Ni(5)-O(17) bond length is 2.04 Å. The Ni(5)-O(20) bond length is 2.11 Å. The Ni(5)-O(21) bond length is 2.04 Å. The Ni(5)-O(24) bond length is 2.16 Å. In the sixth Ni site, Ni(6) is bonded to one O(13), one O(15), one O(18), one O(20), one O(3), and one O(6) atom to form distorted NiO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Ti(5)O6 octahedra,  a cornercorner with one Ti(6)O6 octahedra,  a cornercorner with one Ti(8)O6 octahedra, corners with two equivalent Ti(4)O6 octahedra, corners with two equivalent Ni(1)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra, and  a faceface with one Ti(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-62°. The Ni(6)-O(13) bond length is 2.11 Å. The Ni(6)-O(15) bond length is 2.10 Å. The Ni(6)-O(18) bond length is 2.07 Å. The Ni(6)-O(20) bond length is 2.07 Å. The Ni(6)-O(3) bond length is 2.40 Å. The Ni(6)-O(6) bond length is 2.19 Å. In the seventh Ni site, Ni(7) is bonded to one O(14), one O(16), one O(19), one O(2), one O(21), and one O(7) atom to form NiO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Ti(5)O6 octahedra,  a cornercorner with one Ti(7)O6 octahedra,  a cornercorner with one Ti(8)O6 octahedra, corners with two equivalent Ti(4)O6 octahedra, corners with two equivalent Ni(1)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra, and  a faceface with one Ti(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-62°. The Ni(7)-O(14) bond length is 2.06 Å. The Ni(7)-O(16) bond length is 2.20 Å. The Ni(7)-O(19) bond length is 2.03 Å. The Ni(7)-O(2) bond length is 2.16 Å. The Ni(7)-O(21) bond length is 2.16 Å. The Ni(7)-O(7) bond length is 2.06 Å. In the eighth Ni site, Ni(8) is bonded to one O(12), one O(17), one O(22), one O(23), one O(24), and one O(9) atom to form distorted NiO6 octahedra that share  a cornercorner with one Ti(4)O6 octahedra,  a cornercorner with one Ti(6)O6 octahedra,  a cornercorner with one Ti(7)O6 octahedra,  a cornercorner with one Ti(8)O6 octahedra,  a cornercorner with one Ni(1)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra, corners with two equivalent Ti(3)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra, and  a faceface with one Ti(8)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-65°. The Ni(8)-O(12) bond length is 2.44 Å. The Ni(8)-O(17) bond length is 2.16 Å. The Ni(8)-O(22) bond length is 2.09 Å. The Ni(8)-O(23) bond length is 2.16 Å. The Ni(8)-O(24) bond length is 2.04 Å. The Ni(8)-O(9) bond length is 2.06 Å. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one Ti(1), one Ti(3), and one Ti(5) atom to form a mixture of distorted corner and edge-sharing OMgTi3 tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ti(1), one Ti(2), one Ti(7), and one Ni(7) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ti(1), one Ti(6), one Ni(1), and one Ni(6) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Ti(2), one Ti(5), and one Ni(4) atom. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Ti(3), one Ti(6), and one Ni(2) atom. In the sixth O site, O(6) is bonded to one Ti(4), one Ti(6), one Ni(3), and one Ni(6) atom to form a mixture of distorted corner and edge-sharing OTi2Ni2 trigonal pyramids. In the seventh O site, O(7) is bonded to one Ti(7), one Ni(1), one Ni(2), and one Ni(7) atom to form a mixture of distorted corner and edge-sharing OTiNi3 trigonal pyramids. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Mg(1), one Ti(1), one Ti(7), one Ni(1), and one Ni(4) atom. In the ninth O site, O(9) is bonded in a distorted see-saw-like geometry to one Ti(8), one Ni(1), one Ni(3), and one Ni(8) atom. In the tenth O site, O(10) is bonded to one Ti(4), one Ti(5), one Ni(2), and one Ni(4) atom to form distorted OTi2Ni2 tetrahedra that share  a cornercorner with one O(1)MgTi3 tetrahedra,  a cornercorner with one O(21)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(24)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(6)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(7)TiNi3 trigonal pyramid, corners with two equivalent O(19)Ti2Ni2 trigonal pyramids, and  an edgeedge with one O(15)Ti2Ni2 trigonal pyramid. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Ti(2), one Ti(5), one Ni(3), and one Ni(4) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Ti(3), one Ti(8), one Ni(2), and one Ni(8) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Mg(1), one Ti(6), one Ni(1), and one Ni(6) atom. In the fourteenth O site, O(14) is bonded in a rectangular see-saw-like geometry to one Ti(4), one Ti(7), one Ni(5), and one Ni(7) atom. In the fifteenth O site, O(15) is bonded to one Ti(4), one Ti(5), one Ni(5), and one Ni(6) atom to form distorted OTi2Ni2 trigonal pyramids that share  a cornercorner with one O(1)MgTi3 tetrahedra,  a cornercorner with one O(17)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(18)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(19)Ti2Ni2 trigonal pyramid, corners with two equivalent O(21)Ti2Ni2 trigonal pyramids, corners with two equivalent O(6)Ti2Ni2 trigonal pyramids,  an edgeedge with one O(10)Ti2Ni2 tetrahedra, and  an edgeedge with one O(24)Ti2Ni2 trigonal pyramid. In the sixteenth O site, O(16) is bonded in a distorted see-saw-like geometry to one Ti(1), one Ti(8), one Ni(1), and one Ni(7) atom. In the seventeenth O site, O(17) is bonded to one Ti(2), one Ti(8), one Ni(5), and one Ni(8) atom to form a mixture of distorted corner and edge-sharing OTi2Ni2 trigonal pyramids. In the eighteenth O site, O(18) is bonded to one Ti(2), one Ti(8), one Ni(3), and one Ni(6) atom to form a mixture of distorted corner and edge-sharing OTi2Ni2 trigonal pyramids. In the nineteenth O site, O(19) is bonded to one Ti(3), one Ti(5), one Ni(2), and one Ni(7) atom to form distorted OTi2Ni2 trigonal pyramids that share corners with two equivalent O(10)Ti2Ni2 tetrahedra,  a cornercorner with one O(15)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(21)Ti2Ni2 trigonal pyramid,  an edgeedge with one O(1)MgTi3 tetrahedra, and  an edgeedge with one O(7)TiNi3 trigonal pyramid. In the twentieth O site, O(20) is bonded in a distorted see-saw-like geometry to one Ti(3), one Ti(6), one Ni(5), and one Ni(6) atom. In the twenty-first O site, O(21) is bonded to one Ti(4), one Ti(7), one Ni(5), and one Ni(7) atom to form distorted OTi2Ni2 trigonal pyramids that share  a cornercorner with one O(10)Ti2Ni2 tetrahedra,  a cornercorner with one O(17)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(19)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(6)Ti2Ni2 trigonal pyramid, corners with two equivalent O(15)Ti2Ni2 trigonal pyramids, corners with two equivalent O(24)Ti2Ni2 trigonal pyramids, and  an edgeedge with one O(7)TiNi3 trigonal pyramid. In the twenty-second O site, O(22) is bonded in a 4-coordinate geometry to one Ti(3), one Ti(8), one Ni(2), and one Ni(8) atom. In the twenty-third O site, O(23) is bonded in a 4-coordinate geometry to one Ti(2), one Ti(7), one Ni(3), and one Ni(8) atom. In the twenty-fourth O site, O(24) is bonded to one Ti(4), one Ti(6), one Ni(5), and one Ni(8) atom to form a mixture of distorted corner and edge-sharing OTi2Ni2 trigonal pyramids.