MgTi8(NiO3)8 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(11), one O(15), one O(19), and one O(4) atom. There are eight inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(1), one O(13), one O(16), one O(2), one O(3), and one O(8) atom to form TiO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Ti(8)O6 octahedra,  a cornercorner with one Ni(1)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, and  a faceface with one Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-59°. 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 distorted TiO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(5)O6 octahedra,  a cornercorner with one Ni(3)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(7)O6 octahedra,  an edgeedge with one Ti(8)O6 octahedra, and  a faceface with one Ni(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-60°. 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 Ti(1)O6 octahedra,  a cornercorner with one Ti(5)O6 octahedra,  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(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 37-64°. 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 TiO6 octahedra that share  a cornercorner with one Ti(5)O6 octahedra,  a cornercorner with one Ni(2)O6 octahedra,  a cornercorner with one Ni(3)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(6)O6 octahedra,  an edgeedge with one Ti(7)O6 octahedra,  a faceface with one Ti(5)O6 octahedra, and  a faceface with one Ni(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-55°. In the fifth Ti site, Ti(5) is bonded to one O(10), one O(15), one O(19), one O(21), one O(4), and one O(6) atom to form TiO6 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(6)O6 octahedra,  a cornercorner with one Ti(7)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra,  an edgeedge with one Ni(7)O6 octahedra, and  a faceface with one Ti(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-43°. 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 Ti(5)O6 octahedra,  a cornercorner with one Ni(2)O6 octahedra,  a cornercorner with one Ni(3)O6 octahedra,  a cornercorner with one Ni(6)O6 octahedra,  a cornercorner with one Ni(8)O6 octahedra, corners with two equivalent Ti(1)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 37-59°. 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 Ti(5)O6 octahedra,  a cornercorner with one Ni(2)O6 octahedra,  a cornercorner with one Ni(3)O6 octahedra,  a cornercorner with one Ni(7)O6 octahedra,  a cornercorner with one Ni(8)O6 octahedra, corners with two equivalent Ti(1)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 41-61°. 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 Ti(1)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,  a cornercorner with one Ni(8)O6 octahedra, corners with two equivalent Ni(2)O6 octahedra, corners with two equivalent Ni(3)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 42-63°. 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 Ti(1)O6 octahedra,  a cornercorner with one Ni(2)O6 octahedra,  a cornercorner with one Ni(3)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,  an edgeedge with one Ti(8)O6 octahedra, and  a faceface with one Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-66°. 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(8)O6 octahedra,  an edgeedge with one Ti(5)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 37-66°. In the third Ni site, Ni(3) is bonded to one O(11), one O(18), one O(23), one O(4), one O(6), and one O(9) atom to form NiO6 octahedra that share  a cornercorner with one Ti(2)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(8)O6 octahedra,  an edgeedge with one Ti(5)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra,  an edgeedge with one Ni(8)O6 octahedra, and  a faceface with one Ti(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-61°. In the fourth Ni site, Ni(4) is bonded in a 4-coordinate geometry to one O(1), one O(4), one O(5), 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 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(4)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 Ti(5)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 41-64°. 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 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(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 Ti(1)O6 octahedra,  an edgeedge with one Ti(5)O6 octahedra,  an edgeedge with one Ni(3)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 40-63°. 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(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 Ti(1)O6 octahedra,  an edgeedge with one Ti(5)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 41-61°. 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 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(3)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 47-59°. 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 Ni(4) atom to form distorted OMgTi2Ni trigonal pyramids that share  a cornercorner with one O(15)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(10)MgTi2Ni trigonal pyramid,  a cornercorner with one O(12)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(16)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(22)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(3)Ti2Ni2 trigonal pyramid, corners with two equivalent O(8)Ti2Ni2 trigonal pyramids,  an edgeedge with one O(19)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(4)MgTi2Ni2 trigonal bipyramid, and  an edgeedge with one O(5)Ti2Ni2 trigonal pyramid. 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 to one Ti(1), one Ti(6), one Ni(1), and one Ni(6) atom to form distorted OTi2Ni2 trigonal pyramids that share  a cornercorner with one O(15)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(1)MgTi2Ni trigonal pyramid,  a cornercorner with one O(5)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(9)TiNi3 trigonal pyramid, corners with two equivalent O(16)Ti2Ni2 trigonal pyramids, corners with two equivalent O(8)Ti2Ni2 trigonal pyramids, and  an edgeedge with one O(6)Ti3Ni2 trigonal bipyramid. In the fourth O site, O(4) is bonded to one Mg(1), one Ti(2), one Ti(5), one Ni(3), and one Ni(4) atom to form distorted OMgTi2Ni2 trigonal bipyramids that share  a cornercorner with one O(21)Ti3Ni2 trigonal bipyramid,  a cornercorner with one O(17)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(5)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(8)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(9)TiNi3 trigonal pyramid, corners with two equivalent O(10)MgTi2Ni trigonal pyramids,  an edgeedge with one O(15)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(19)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(6)Ti3Ni2 trigonal bipyramid,  an edgeedge with one O(1)MgTi2Ni trigonal pyramid, and  an edgeedge with one O(23)Ti2Ni2 trigonal pyramid. In the fifth O site, O(5) is bonded to one Ti(3), one Ti(6), one Ni(2), and one Ni(4) atom to form distorted OTi2Ni2 trigonal pyramids that share  a cornercorner with one O(4)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(6)Ti3Ni2 trigonal bipyramid,  a cornercorner with one O(10)MgTi2Ni trigonal pyramid,  a cornercorner with one O(3)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(8)Ti2Ni2 trigonal pyramid, corners with two equivalent O(12)Ti2Ni2 trigonal pyramids,  an edgeedge with one O(19)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(1)MgTi2Ni trigonal pyramid, and  an edgeedge with one O(22)Ti2Ni2 trigonal pyramid. In the sixth O site, O(6) is bonded to one Ti(4), one Ti(5), one Ti(6), one Ni(3), and one Ni(6) atom to form distorted OTi3Ni2 trigonal bipyramids that share  a cornercorner with one O(15)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(19)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(23)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(5)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(9)TiNi3 trigonal pyramid,  an edgeedge with one O(15)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(4)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(21)Ti3Ni2 trigonal bipyramid,  an edgeedge with one O(10)MgTi2Ni trigonal pyramid, and  an edgeedge with one O(3)Ti2Ni2 trigonal pyramid. In the seventh O site, O(7) is bonded in a distorted see-saw-like geometry to one Ti(7), one Ni(1), one Ni(2), and one Ni(7) atom. In the eighth O site, O(8) is bonded to one Ti(1), one Ti(7), one Ni(1), and one Ni(4) atom to form OTi2Ni2 trigonal pyramids that share  a cornercorner with one O(4)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(21)Ti3Ni2 trigonal bipyramid,  a cornercorner with one O(23)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(5)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(9)TiNi3 trigonal pyramid, corners with two equivalent O(1)MgTi2Ni trigonal pyramids, corners with two equivalent O(3)Ti2Ni2 trigonal pyramids, and  an edgeedge with one O(16)Ti2Ni2 trigonal pyramid. In the ninth O site, O(9) is bonded to one Ti(8), one Ni(1), one Ni(3), and one Ni(8) atom to form distorted OTiNi3 trigonal pyramids that share  a cornercorner with one O(4)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(6)Ti3Ni2 trigonal bipyramid,  a cornercorner with one O(3)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(8)Ti2Ni2 trigonal pyramid, corners with two equivalent O(22)Ti2Ni2 trigonal pyramids,  an edgeedge with one O(12)Ti2Ni2 trigonal pyramid,  an edgeedge with one O(16)Ti2Ni2 trigonal pyramid,  an edgeedge with one O(17)Ti2Ni2 trigonal pyramid, and  an edgeedge with one O(23)Ti2Ni2 trigonal pyramid. In the tenth O site, O(10) is bonded to one Mg(1), one Ti(4), one Ti(5), and one Ni(2) atom to form distorted OMgTi2Ni trigonal pyramids that share  a cornercorner with one O(15)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(19)MgTi2Ni2 trigonal bipyramid, corners with two equivalent O(4)MgTi2Ni2 trigonal bipyramids,  a cornercorner with one O(1)MgTi2Ni trigonal pyramid,  a cornercorner with one O(12)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(22)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(5)Ti2Ni2 trigonal pyramid,  an edgeedge with one O(15)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(19)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(21)Ti3Ni2 trigonal bipyramid, and  an edgeedge with one O(6)Ti3Ni2 trigonal bipyramid. In the eleventh O site, O(11) is bonded in a trigonal planar geometry to one Mg(1), one Ti(2), and one Ni(3) atom. In the twelfth O site, O(12) is bonded to one Ti(3), one Ti(8), one Ni(2), and one Ni(8) atom to form distorted OTi2Ni2 trigonal pyramids that share corners with two equivalent O(19)MgTi2Ni2 trigonal bipyramids,  a cornercorner with one O(1)MgTi2Ni trigonal pyramid,  a cornercorner with one O(10)MgTi2Ni trigonal pyramid,  a cornercorner with one O(16)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(23)Ti2Ni2 trigonal pyramid, corners with two equivalent O(5)Ti2Ni2 trigonal pyramids,  an edgeedge with one O(17)Ti2Ni2 trigonal pyramid,  an edgeedge with one O(9)TiNi3 trigonal pyramid, and edges with two equivalent O(22)Ti2Ni2 trigonal pyramids. In the thirteenth O site, O(13) is bonded in a distorted rectangular see-saw-like geometry to one Ti(1), one Ti(6), one Ni(1), and one Ni(6) atom. In the fourteenth O site, O(14) is bonded in a distorted 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 Mg(1), one Ti(4), one Ti(5), one Ni(5), and one Ni(6) atom to form distorted OMgTi2Ni2 trigonal bipyramids that share  a cornercorner with one O(21)Ti3Ni2 trigonal bipyramid,  a cornercorner with one O(6)Ti3Ni2 trigonal bipyramid,  a cornercorner with one O(1)MgTi2Ni trigonal pyramid,  a cornercorner with one O(10)MgTi2Ni trigonal pyramid,  a cornercorner with one O(17)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(3)Ti2Ni2 trigonal pyramid,  an edgeedge with one O(19)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(4)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(21)Ti3Ni2 trigonal bipyramid,  an edgeedge with one O(6)Ti3Ni2 trigonal bipyramid, and  an edgeedge with one O(10)MgTi2Ni trigonal pyramid. In the sixteenth O site, O(16) is bonded to one Ti(1), one Ti(8), one Ni(1), and one Ni(7) atom to form distorted OTi2Ni2 trigonal pyramids that share  a cornercorner with one O(19)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(21)Ti3Ni2 trigonal bipyramid,  a cornercorner with one O(1)MgTi2Ni trigonal pyramid,  a cornercorner with one O(12)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(17)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(22)Ti2Ni2 trigonal pyramid, corners with two equivalent O(3)Ti2Ni2 trigonal pyramids,  an edgeedge with one O(8)Ti2Ni2 trigonal pyramid, and  an edgeedge with one O(9)TiNi3 trigonal pyramid. 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 distorted OTi2Ni2 trigonal pyramids that share  a cornercorner with one O(15)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(4)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(21)Ti3Ni2 trigonal bipyramid,  a cornercorner with one O(16)Ti2Ni2 trigonal pyramid, corners with two equivalent O(22)Ti2Ni2 trigonal pyramids, corners with two equivalent O(23)Ti2Ni2 trigonal pyramids,  an edgeedge with one O(12)Ti2Ni2 trigonal pyramid, and  an edgeedge with one O(9)TiNi3 trigonal pyramid. In the eighteenth O site, O(18) is bonded in a distorted see-saw-like geometry to one Ti(2), one Ti(8), one Ni(3), and one Ni(6) atom. In the nineteenth O site, O(19) is bonded to one Mg(1), one Ti(3), one Ti(5), one Ni(2), and one Ni(7) atom to form distorted OMgTi2Ni2 trigonal bipyramids that share  a cornercorner with one O(6)Ti3Ni2 trigonal bipyramid,  a cornercorner with one O(10)MgTi2Ni trigonal pyramid,  a cornercorner with one O(16)Ti2Ni2 trigonal pyramid, corners with two equivalent O(12)Ti2Ni2 trigonal pyramids,  an edgeedge with one O(15)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(4)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(21)Ti3Ni2 trigonal bipyramid,  an edgeedge with one O(1)MgTi2Ni trigonal pyramid,  an edgeedge with one O(10)MgTi2Ni trigonal pyramid,  an edgeedge with one O(22)Ti2Ni2 trigonal pyramid, and  an edgeedge with one O(5)Ti2Ni2 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(5), one Ti(7), one Ni(5), and one Ni(7) atom to form distorted OTi3Ni2 trigonal bipyramids that share  a cornercorner with one O(15)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(4)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(16)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(17)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(23)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(8)Ti2Ni2 trigonal pyramid,  an edgeedge with one O(15)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(19)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(6)Ti3Ni2 trigonal bipyramid, and  an edgeedge with one O(10)MgTi2Ni trigonal pyramid. In the twenty-second O site, O(22) is bonded to one Ti(3), one Ti(8), one Ni(2), and one Ni(8) atom to form distorted OTi2Ni2 trigonal pyramids that share  a cornercorner with one O(1)MgTi2Ni trigonal pyramid,  a cornercorner with one O(10)MgTi2Ni trigonal pyramid,  a cornercorner with one O(16)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(23)Ti2Ni2 trigonal pyramid, corners with two equivalent O(17)Ti2Ni2 trigonal pyramids, corners with two equivalent O(9)TiNi3 trigonal pyramids,  an edgeedge with one O(19)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(5)Ti2Ni2 trigonal pyramid, and edges with two equivalent O(12)Ti2Ni2 trigonal pyramids. In the twenty-third O site, O(23) is bonded to one Ti(2), one Ti(7), one Ni(3), and one Ni(8) atom to form distorted OTi2Ni2 trigonal pyramids that share  a cornercorner with one O(21)Ti3Ni2 trigonal bipyramid,  a cornercorner with one O(6)Ti3Ni2 trigonal bipyramid,  a cornercorner with one O(12)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(22)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(8)Ti2Ni2 trigonal pyramid, corners with two equivalent O(17)Ti2Ni2 trigonal pyramids,  an edgeedge with one O(4)MgTi2Ni2 trigonal bipyramid, and  an edgeedge with one O(9)TiNi3 trigonal pyramid. In the twenty-fourth O site, O(24) is bonded in a 4-coordinate geometry to one Ti(4), one Ti(6), one Ni(5), and one Ni(8) atom.
MgTi8(NiO3)8 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(11), one O(15), one O(19), and one O(4) atom. The Mg(1)-O(1) bond length is 1.98 Å. The Mg(1)-O(10) bond length is 1.94 Å. The Mg(1)-O(11) bond length is 1.96 Å. The Mg(1)-O(15) bond length is 2.34 Å. The Mg(1)-O(19) bond length is 2.25 Å. The Mg(1)-O(4) bond length is 2.23 Å. There are eight inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(1), one O(13), one O(16), one O(2), one O(3), and one O(8) atom to form TiO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Ti(8)O6 octahedra,  a cornercorner with one Ni(1)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, and  a faceface with one Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-59°. The Ti(1)-O(1) bond length is 1.87 Å. The Ti(1)-O(13) bond length is 2.10 Å. The Ti(1)-O(16) bond length is 2.12 Å. The Ti(1)-O(2) bond length is 1.97 Å. The Ti(1)-O(3) bond length is 1.91 Å. The Ti(1)-O(8) bond length is 2.12 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 distorted TiO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(5)O6 octahedra,  a cornercorner with one Ni(3)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(7)O6 octahedra,  an edgeedge with one Ti(8)O6 octahedra, and  a faceface with one Ni(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-60°. The Ti(2)-O(11) bond length is 1.79 Å. The Ti(2)-O(17) bond length is 1.86 Å. The Ti(2)-O(18) bond length is 2.09 Å. The Ti(2)-O(2) bond length is 2.02 Å. The Ti(2)-O(23) bond length is 2.12 Å. The Ti(2)-O(4) bond length is 2.17 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 Ti(1)O6 octahedra,  a cornercorner with one Ti(5)O6 octahedra,  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(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 37-64°. The Ti(3)-O(1) bond length is 2.01 Å. The Ti(3)-O(12) bond length is 1.85 Å. The Ti(3)-O(19) bond length is 2.18 Å. The Ti(3)-O(20) bond length is 1.89 Å. The Ti(3)-O(22) bond length is 1.95 Å. The Ti(3)-O(5) bond length is 2.15 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 TiO6 octahedra that share  a cornercorner with one Ti(5)O6 octahedra,  a cornercorner with one Ni(2)O6 octahedra,  a cornercorner with one Ni(3)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(6)O6 octahedra,  an edgeedge with one Ti(7)O6 octahedra,  a faceface with one Ti(5)O6 octahedra, and  a faceface with one Ni(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-55°. The Ti(4)-O(10) bond length is 2.00 Å. The Ti(4)-O(14) bond length is 1.99 Å. The Ti(4)-O(15) bond length is 2.00 Å. The Ti(4)-O(21) bond length is 2.03 Å. The Ti(4)-O(24) bond length is 1.96 Å. The Ti(4)-O(6) bond length is 2.08 Å. In the fifth Ti site, Ti(5) is bonded to one O(10), one O(15), one O(19), one O(21), one O(4), and one O(6) atom to form TiO6 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(6)O6 octahedra,  a cornercorner with one Ti(7)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Ni(5)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra,  an edgeedge with one Ni(7)O6 octahedra, and  a faceface with one Ti(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-43°. The Ti(5)-O(10) bond length is 1.96 Å. The Ti(5)-O(15) bond length is 2.03 Å. The Ti(5)-O(19) bond length is 1.96 Å. The Ti(5)-O(21) bond length is 2.14 Å. The Ti(5)-O(4) bond length is 1.92 Å. The Ti(5)-O(6) bond length is 2.10 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 Ti(5)O6 octahedra,  a cornercorner with one Ni(2)O6 octahedra,  a cornercorner with one Ni(3)O6 octahedra,  a cornercorner with one Ni(6)O6 octahedra,  a cornercorner with one Ni(8)O6 octahedra, corners with two equivalent Ti(1)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 37-59°. The Ti(6)-O(13) bond length is 1.90 Å. The Ti(6)-O(20) bond length is 2.12 Å. The Ti(6)-O(24) bond length is 1.92 Å. The Ti(6)-O(3) bond length is 2.20 Å. The Ti(6)-O(5) bond length is 1.83 Å. The Ti(6)-O(6) bond length is 2.18 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 Ti(5)O6 octahedra,  a cornercorner with one Ni(2)O6 octahedra,  a cornercorner with one Ni(3)O6 octahedra,  a cornercorner with one Ni(7)O6 octahedra,  a cornercorner with one Ni(8)O6 octahedra, corners with two equivalent Ti(1)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 41-61°. The Ti(7)-O(14) bond length is 1.90 Å. The Ti(7)-O(2) bond length is 2.26 Å. The Ti(7)-O(21) bond length is 2.31 Å. The Ti(7)-O(23) bond length is 1.92 Å. The Ti(7)-O(7) bond length is 1.97 Å. The Ti(7)-O(8) bond length is 1.86 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 Ti(1)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,  a cornercorner with one Ni(8)O6 octahedra, corners with two equivalent Ni(2)O6 octahedra, corners with two equivalent Ni(3)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 42-63°. The Ti(8)-O(12) bond length is 2.15 Å. The Ti(8)-O(16) bond length is 1.86 Å. The Ti(8)-O(17) bond length is 2.17 Å. The Ti(8)-O(18) bond length is 1.88 Å. The Ti(8)-O(22) bond length is 2.01 Å. The Ti(8)-O(9) bond length is 1.96 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 Ti(1)O6 octahedra,  a cornercorner with one Ni(2)O6 octahedra,  a cornercorner with one Ni(3)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,  an edgeedge with one Ti(8)O6 octahedra, and  a faceface with one Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-66°. The Ni(1)-O(13) bond length is 2.19 Å. The Ni(1)-O(16) bond length is 2.19 Å. The Ni(1)-O(3) bond length is 2.08 Å. The Ni(1)-O(7) bond length is 2.02 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(8)O6 octahedra,  an edgeedge with one Ti(5)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 37-66°. The Ni(2)-O(10) bond length is 2.05 Å. The Ni(2)-O(12) bond length is 2.06 Å. The Ni(2)-O(19) bond length is 2.24 Å. The Ni(2)-O(22) bond length is 2.15 Å. The Ni(2)-O(5) bond length is 2.14 Å. The Ni(2)-O(7) bond length is 2.02 Å. In the third Ni site, Ni(3) is bonded to one O(11), one O(18), one O(23), one O(4), one O(6), and one O(9) atom to form NiO6 octahedra that share  a cornercorner with one Ti(2)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(8)O6 octahedra,  an edgeedge with one Ti(5)O6 octahedra,  an edgeedge with one Ni(6)O6 octahedra,  an edgeedge with one Ni(8)O6 octahedra, and  a faceface with one Ti(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-61°. The Ni(3)-O(11) bond length is 1.99 Å. The Ni(3)-O(18) bond length is 2.15 Å. The Ni(3)-O(23) bond length is 2.14 Å. The Ni(3)-O(4) bond length is 2.16 Å. The Ni(3)-O(6) bond length is 2.20 Å. The Ni(3)-O(9) bond length is 2.03 Å. In the fourth Ni site, Ni(4) is bonded in a 4-coordinate geometry to one O(1), one O(4), one O(5), and one O(8) atom. The Ni(4)-O(1) bond length is 2.39 Å. The Ni(4)-O(4) bond length is 2.00 Å. The Ni(4)-O(5) bond length is 1.98 Å. The Ni(4)-O(8) bond length is 2.02 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 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(4)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 Ti(5)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 41-64°. The Ni(5)-O(14) bond length is 2.21 Å. The Ni(5)-O(15) bond length is 2.21 Å. The Ni(5)-O(17) bond length is 1.98 Å. The Ni(5)-O(20) bond length is 2.01 Å. The Ni(5)-O(21) bond length is 2.03 Å. The Ni(5)-O(24) bond length is 2.26 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 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(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 Ti(1)O6 octahedra,  an edgeedge with one Ti(5)O6 octahedra,  an edgeedge with one Ni(3)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 40-63°. The Ni(6)-O(13) bond length is 2.07 Å. The Ni(6)-O(15) bond length is 2.08 Å. The Ni(6)-O(18) bond length is 2.10 Å. The Ni(6)-O(20) bond length is 2.18 Å. The Ni(6)-O(3) bond length is 2.06 Å. The Ni(6)-O(6) bond length is 2.20 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(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 Ti(1)O6 octahedra,  an edgeedge with one Ti(5)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 41-61°. The Ni(7)-O(14) bond length is 2.09 Å. The Ni(7)-O(16) bond length is 2.04 Å. The Ni(7)-O(19) bond length is 2.15 Å. The Ni(7)-O(2) bond length is 2.18 Å. The Ni(7)-O(21) bond length is 2.16 Å. The Ni(7)-O(7) bond length is 2.03 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 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(3)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 47-59°. The Ni(8)-O(12) bond length is 2.22 Å. The Ni(8)-O(17) bond length is 2.17 Å. The Ni(8)-O(22) bond length is 2.11 Å. The Ni(8)-O(23) bond length is 2.13 Å. The Ni(8)-O(24) bond length is 2.06 Å. The Ni(8)-O(9) bond length is 2.04 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 Ni(4) atom to form distorted OMgTi2Ni trigonal pyramids that share  a cornercorner with one O(15)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(10)MgTi2Ni trigonal pyramid,  a cornercorner with one O(12)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(16)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(22)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(3)Ti2Ni2 trigonal pyramid, corners with two equivalent O(8)Ti2Ni2 trigonal pyramids,  an edgeedge with one O(19)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(4)MgTi2Ni2 trigonal bipyramid, and  an edgeedge with one O(5)Ti2Ni2 trigonal pyramid. 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 to one Ti(1), one Ti(6), one Ni(1), and one Ni(6) atom to form distorted OTi2Ni2 trigonal pyramids that share  a cornercorner with one O(15)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(1)MgTi2Ni trigonal pyramid,  a cornercorner with one O(5)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(9)TiNi3 trigonal pyramid, corners with two equivalent O(16)Ti2Ni2 trigonal pyramids, corners with two equivalent O(8)Ti2Ni2 trigonal pyramids, and  an edgeedge with one O(6)Ti3Ni2 trigonal bipyramid. In the fourth O site, O(4) is bonded to one Mg(1), one Ti(2), one Ti(5), one Ni(3), and one Ni(4) atom to form distorted OMgTi2Ni2 trigonal bipyramids that share  a cornercorner with one O(21)Ti3Ni2 trigonal bipyramid,  a cornercorner with one O(17)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(5)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(8)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(9)TiNi3 trigonal pyramid, corners with two equivalent O(10)MgTi2Ni trigonal pyramids,  an edgeedge with one O(15)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(19)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(6)Ti3Ni2 trigonal bipyramid,  an edgeedge with one O(1)MgTi2Ni trigonal pyramid, and  an edgeedge with one O(23)Ti2Ni2 trigonal pyramid. In the fifth O site, O(5) is bonded to one Ti(3), one Ti(6), one Ni(2), and one Ni(4) atom to form distorted OTi2Ni2 trigonal pyramids that share  a cornercorner with one O(4)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(6)Ti3Ni2 trigonal bipyramid,  a cornercorner with one O(10)MgTi2Ni trigonal pyramid,  a cornercorner with one O(3)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(8)Ti2Ni2 trigonal pyramid, corners with two equivalent O(12)Ti2Ni2 trigonal pyramids,  an edgeedge with one O(19)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(1)MgTi2Ni trigonal pyramid, and  an edgeedge with one O(22)Ti2Ni2 trigonal pyramid. In the sixth O site, O(6) is bonded to one Ti(4), one Ti(5), one Ti(6), one Ni(3), and one Ni(6) atom to form distorted OTi3Ni2 trigonal bipyramids that share  a cornercorner with one O(15)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(19)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(23)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(5)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(9)TiNi3 trigonal pyramid,  an edgeedge with one O(15)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(4)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(21)Ti3Ni2 trigonal bipyramid,  an edgeedge with one O(10)MgTi2Ni trigonal pyramid, and  an edgeedge with one O(3)Ti2Ni2 trigonal pyramid. In the seventh O site, O(7) is bonded in a distorted see-saw-like geometry to one Ti(7), one Ni(1), one Ni(2), and one Ni(7) atom. In the eighth O site, O(8) is bonded to one Ti(1), one Ti(7), one Ni(1), and one Ni(4) atom to form OTi2Ni2 trigonal pyramids that share  a cornercorner with one O(4)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(21)Ti3Ni2 trigonal bipyramid,  a cornercorner with one O(23)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(5)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(9)TiNi3 trigonal pyramid, corners with two equivalent O(1)MgTi2Ni trigonal pyramids, corners with two equivalent O(3)Ti2Ni2 trigonal pyramids, and  an edgeedge with one O(16)Ti2Ni2 trigonal pyramid. In the ninth O site, O(9) is bonded to one Ti(8), one Ni(1), one Ni(3), and one Ni(8) atom to form distorted OTiNi3 trigonal pyramids that share  a cornercorner with one O(4)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(6)Ti3Ni2 trigonal bipyramid,  a cornercorner with one O(3)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(8)Ti2Ni2 trigonal pyramid, corners with two equivalent O(22)Ti2Ni2 trigonal pyramids,  an edgeedge with one O(12)Ti2Ni2 trigonal pyramid,  an edgeedge with one O(16)Ti2Ni2 trigonal pyramid,  an edgeedge with one O(17)Ti2Ni2 trigonal pyramid, and  an edgeedge with one O(23)Ti2Ni2 trigonal pyramid. In the tenth O site, O(10) is bonded to one Mg(1), one Ti(4), one Ti(5), and one Ni(2) atom to form distorted OMgTi2Ni trigonal pyramids that share  a cornercorner with one O(15)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(19)MgTi2Ni2 trigonal bipyramid, corners with two equivalent O(4)MgTi2Ni2 trigonal bipyramids,  a cornercorner with one O(1)MgTi2Ni trigonal pyramid,  a cornercorner with one O(12)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(22)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(5)Ti2Ni2 trigonal pyramid,  an edgeedge with one O(15)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(19)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(21)Ti3Ni2 trigonal bipyramid, and  an edgeedge with one O(6)Ti3Ni2 trigonal bipyramid. In the eleventh O site, O(11) is bonded in a trigonal planar geometry to one Mg(1), one Ti(2), and one Ni(3) atom. In the twelfth O site, O(12) is bonded to one Ti(3), one Ti(8), one Ni(2), and one Ni(8) atom to form distorted OTi2Ni2 trigonal pyramids that share corners with two equivalent O(19)MgTi2Ni2 trigonal bipyramids,  a cornercorner with one O(1)MgTi2Ni trigonal pyramid,  a cornercorner with one O(10)MgTi2Ni trigonal pyramid,  a cornercorner with one O(16)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(23)Ti2Ni2 trigonal pyramid, corners with two equivalent O(5)Ti2Ni2 trigonal pyramids,  an edgeedge with one O(17)Ti2Ni2 trigonal pyramid,  an edgeedge with one O(9)TiNi3 trigonal pyramid, and edges with two equivalent O(22)Ti2Ni2 trigonal pyramids. In the thirteenth O site, O(13) is bonded in a distorted rectangular see-saw-like geometry to one Ti(1), one Ti(6), one Ni(1), and one Ni(6) atom. In the fourteenth O site, O(14) is bonded in a distorted 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 Mg(1), one Ti(4), one Ti(5), one Ni(5), and one Ni(6) atom to form distorted OMgTi2Ni2 trigonal bipyramids that share  a cornercorner with one O(21)Ti3Ni2 trigonal bipyramid,  a cornercorner with one O(6)Ti3Ni2 trigonal bipyramid,  a cornercorner with one O(1)MgTi2Ni trigonal pyramid,  a cornercorner with one O(10)MgTi2Ni trigonal pyramid,  a cornercorner with one O(17)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(3)Ti2Ni2 trigonal pyramid,  an edgeedge with one O(19)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(4)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(21)Ti3Ni2 trigonal bipyramid,  an edgeedge with one O(6)Ti3Ni2 trigonal bipyramid, and  an edgeedge with one O(10)MgTi2Ni trigonal pyramid. In the sixteenth O site, O(16) is bonded to one Ti(1), one Ti(8), one Ni(1), and one Ni(7) atom to form distorted OTi2Ni2 trigonal pyramids that share  a cornercorner with one O(19)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(21)Ti3Ni2 trigonal bipyramid,  a cornercorner with one O(1)MgTi2Ni trigonal pyramid,  a cornercorner with one O(12)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(17)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(22)Ti2Ni2 trigonal pyramid, corners with two equivalent O(3)Ti2Ni2 trigonal pyramids,  an edgeedge with one O(8)Ti2Ni2 trigonal pyramid, and  an edgeedge with one O(9)TiNi3 trigonal pyramid. 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 distorted OTi2Ni2 trigonal pyramids that share  a cornercorner with one O(15)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(4)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(21)Ti3Ni2 trigonal bipyramid,  a cornercorner with one O(16)Ti2Ni2 trigonal pyramid, corners with two equivalent O(22)Ti2Ni2 trigonal pyramids, corners with two equivalent O(23)Ti2Ni2 trigonal pyramids,  an edgeedge with one O(12)Ti2Ni2 trigonal pyramid, and  an edgeedge with one O(9)TiNi3 trigonal pyramid. In the eighteenth O site, O(18) is bonded in a distorted see-saw-like geometry to one Ti(2), one Ti(8), one Ni(3), and one Ni(6) atom. In the nineteenth O site, O(19) is bonded to one Mg(1), one Ti(3), one Ti(5), one Ni(2), and one Ni(7) atom to form distorted OMgTi2Ni2 trigonal bipyramids that share  a cornercorner with one O(6)Ti3Ni2 trigonal bipyramid,  a cornercorner with one O(10)MgTi2Ni trigonal pyramid,  a cornercorner with one O(16)Ti2Ni2 trigonal pyramid, corners with two equivalent O(12)Ti2Ni2 trigonal pyramids,  an edgeedge with one O(15)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(4)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(21)Ti3Ni2 trigonal bipyramid,  an edgeedge with one O(1)MgTi2Ni trigonal pyramid,  an edgeedge with one O(10)MgTi2Ni trigonal pyramid,  an edgeedge with one O(22)Ti2Ni2 trigonal pyramid, and  an edgeedge with one O(5)Ti2Ni2 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(5), one Ti(7), one Ni(5), and one Ni(7) atom to form distorted OTi3Ni2 trigonal bipyramids that share  a cornercorner with one O(15)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(4)MgTi2Ni2 trigonal bipyramid,  a cornercorner with one O(16)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(17)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(23)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(8)Ti2Ni2 trigonal pyramid,  an edgeedge with one O(15)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(19)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(6)Ti3Ni2 trigonal bipyramid, and  an edgeedge with one O(10)MgTi2Ni trigonal pyramid. In the twenty-second O site, O(22) is bonded to one Ti(3), one Ti(8), one Ni(2), and one Ni(8) atom to form distorted OTi2Ni2 trigonal pyramids that share  a cornercorner with one O(1)MgTi2Ni trigonal pyramid,  a cornercorner with one O(10)MgTi2Ni trigonal pyramid,  a cornercorner with one O(16)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(23)Ti2Ni2 trigonal pyramid, corners with two equivalent O(17)Ti2Ni2 trigonal pyramids, corners with two equivalent O(9)TiNi3 trigonal pyramids,  an edgeedge with one O(19)MgTi2Ni2 trigonal bipyramid,  an edgeedge with one O(5)Ti2Ni2 trigonal pyramid, and edges with two equivalent O(12)Ti2Ni2 trigonal pyramids. In the twenty-third O site, O(23) is bonded to one Ti(2), one Ti(7), one Ni(3), and one Ni(8) atom to form distorted OTi2Ni2 trigonal pyramids that share  a cornercorner with one O(21)Ti3Ni2 trigonal bipyramid,  a cornercorner with one O(6)Ti3Ni2 trigonal bipyramid,  a cornercorner with one O(12)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(22)Ti2Ni2 trigonal pyramid,  a cornercorner with one O(8)Ti2Ni2 trigonal pyramid, corners with two equivalent O(17)Ti2Ni2 trigonal pyramids,  an edgeedge with one O(4)MgTi2Ni2 trigonal bipyramid, and  an edgeedge with one O(9)TiNi3 trigonal pyramid. In the twenty-fourth O site, O(24) is bonded in a 4-coordinate geometry to one Ti(4), one Ti(6), one Ni(5), and one Ni(8) atom.