Y4Ti13Si2(SbO14)2 crystallizes in the triclinic P1 space group. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded in a 6-coordinate geometry to one O(12), one O(13), one O(2), one O(28), one O(5), and one O(8) atom. In the second Y site, Y(2) is bonded in a 6-coordinate geometry to one O(1), one O(19), one O(2), one O(24), one O(28), and one O(7) atom. In the third Y site, Y(3) is bonded in a 6-coordinate geometry to one O(19), one O(2), one O(24), one O(27), one O(5), and one O(7) atom. In the fourth Y site, Y(4) is bonded in a 7-coordinate geometry to one O(13), one O(21), one O(24), one O(28), one O(5), one O(6), and one O(8) atom. There are thirteen inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(21), one O(25), one O(27), one O(5), and one O(6) atom to form TiO5 trigonal bipyramids that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Ti(12)O5 trigonal bipyramid, corners with two equivalent Ti(5)O5 trigonal bipyramids, and  an edgeedge with one Ti(3)O5 trigonal bipyramid. In the second Ti site, Ti(2) is bonded to one O(1), one O(11), one O(14), one O(15), and one O(3) atom to form distorted TiO5 trigonal bipyramids that share  a cornercorner with one Ti(8)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra,  a cornercorner with one Ti(9)O5 trigonal bipyramid, corners with two equivalent Ti(4)O5 trigonal bipyramids, and  an edgeedge with one Ti(11)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 48°. In the third Ti site, Ti(3) is bonded to one O(22), one O(23), one O(24), one O(27), and one O(6) atom to form distorted TiO5 trigonal bipyramids that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Ti(12)O5 trigonal bipyramid,  an edgeedge with one Ti(1)O5 trigonal bipyramid, and  an edgeedge with one Ti(5)O5 trigonal bipyramid. In the fourth Ti site, Ti(4) is bonded to one O(1), one O(11), one O(12), one O(2), and one O(20) atom to form TiO5 trigonal bipyramids that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Ti(9)O5 trigonal bipyramid, corners with two equivalent Ti(2)O5 trigonal bipyramids, and  an edgeedge with one Ti(11)O5 trigonal bipyramid. In the fifth Ti site, Ti(5) is bonded to one O(16), one O(17), one O(22), one O(25), and one O(6) atom to form distorted TiO5 trigonal bipyramids that share  a cornercorner with one Ti(8)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra,  a cornercorner with one Ti(12)O5 trigonal bipyramid, corners with two equivalent Ti(1)O5 trigonal bipyramids, and  an edgeedge with one Ti(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 44°. In the sixth Ti site, Ti(6) is bonded in a 6-coordinate geometry to one O(13), one O(19), one O(20), one O(26), one O(7), and one O(8) atom. In the seventh Ti site, Ti(7) is bonded in a distorted rectangular see-saw-like geometry to one O(10), one O(12), one O(15), and one O(16) atom. In the eighth Ti site, Ti(8) is bonded to one O(10), one O(14), one O(17), one O(18), one O(4), and one O(9) atom to form TiO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Ti(12)O5 trigonal bipyramid,  a cornercorner with one Ti(2)O5 trigonal bipyramid,  a cornercorner with one Ti(5)O5 trigonal bipyramid,  a cornercorner with one Ti(9)O5 trigonal bipyramid,  an edgeedge with one Ti(12)O5 trigonal bipyramid, and  an edgeedge with one Ti(9)O5 trigonal bipyramid. In the ninth Ti site, Ti(9) is bonded to one O(10), one O(14), one O(20), one O(26), and one O(9) atom to form distorted TiO5 trigonal bipyramids that share  a cornercorner with one Ti(8)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Ti(11)O5 trigonal bipyramid,  a cornercorner with one Ti(2)O5 trigonal bipyramid,  a cornercorner with one Ti(4)O5 trigonal bipyramid, and  an edgeedge with one Ti(8)O6 octahedra. The corner-sharing octahedral tilt angles are 49°. In the tenth Ti site, Ti(10) is bonded in a distorted rectangular see-saw-like geometry to one O(18), one O(22), one O(27), and one O(3) atom. In the eleventh Ti site, Ti(11) is bonded to one O(1), one O(12), one O(15), one O(26), and one O(28) atom to form distorted TiO5 trigonal bipyramids that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Ti(9)O5 trigonal bipyramid,  an edgeedge with one Ti(2)O5 trigonal bipyramid, and  an edgeedge with one Ti(4)O5 trigonal bipyramid. In the twelfth Ti site, Ti(12) is bonded to one O(17), one O(18), one O(21), one O(23), and one O(4) atom to form distorted TiO5 trigonal bipyramids that share  a cornercorner with one Ti(8)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Ti(1)O5 trigonal bipyramid,  a cornercorner with one Ti(3)O5 trigonal bipyramid,  a cornercorner with one Ti(5)O5 trigonal bipyramid, and  an edgeedge with one Ti(8)O6 octahedra. The corner-sharing octahedral tilt angles are 46°. In the thirteenth Ti site, Ti(13) is bonded in a 6-coordinate geometry to one O(13), one O(19), one O(21), one O(23), one O(7), and one O(8) atom. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(11), one O(22), one O(3), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Ti(8)O6 octahedra,  a cornercorner with one Ti(12)O5 trigonal bipyramid,  a cornercorner with one Ti(3)O5 trigonal bipyramid,  a cornercorner with one Ti(4)O5 trigonal bipyramid,  a cornercorner with one Ti(5)O5 trigonal bipyramid, and corners with two equivalent Ti(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 58°. In the second Si site, Si(2) is bonded to one O(15), one O(16), one O(25), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Ti(8)O6 octahedra,  a cornercorner with one Ti(1)O5 trigonal bipyramid,  a cornercorner with one Ti(11)O5 trigonal bipyramid,  a cornercorner with one Ti(2)O5 trigonal bipyramid,  a cornercorner with one Ti(9)O5 trigonal bipyramid, and corners with two equivalent Ti(5)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 57°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a single-bond geometry to one O(10) atom. In the second Sb site, Sb(2) is bonded in a single-bond geometry to one O(18) atom. There are twenty-eight inequivalent O sites. In the first O site, O(1) is bonded to one Y(2), one Ti(11), one Ti(2), and one Ti(4) atom to form OYTi3 trigonal pyramids that share  a cornercorner with one O(19)Y2Ti2 tetrahedra,  a cornercorner with one O(7)Y2Ti2 tetrahedra,  a cornercorner with one O(24)Y3Ti tetrahedra, corners with two equivalent O(2)Y3Ti tetrahedra,  an edgeedge with one O(28)Y3Ti tetrahedra, and  an edgeedge with one O(12)YTi3 trigonal pyramid. In the second O site, O(2) is bonded to one Y(1), one Y(2), one Y(3), and one Ti(4) atom to form OY3Ti tetrahedra that share  a cornercorner with one O(13)Y2Ti2 tetrahedra,  a cornercorner with one O(8)Y2Ti2 tetrahedra, corners with two equivalent O(7)Y2Ti2 tetrahedra, corners with two equivalent O(24)Y3Ti tetrahedra,  a cornercorner with one O(27)YTi3 trigonal pyramid, corners with two equivalent O(1)YTi3 trigonal pyramids,  an edgeedge with one O(19)Y2Ti2 tetrahedra,  an edgeedge with one O(28)Y3Ti tetrahedra,  an edgeedge with one O(5)Y3Ti tetrahedra, and  an edgeedge with one O(12)YTi3 trigonal pyramid. In the third O site, O(3) is bonded in a trigonal non-coplanar geometry to one Ti(10), one Ti(2), and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Ti(12), one Ti(8), and one Si(1) atom. In the fifth O site, O(5) is bonded to one Y(1), one Y(3), one Y(4), and one Ti(1) atom to form OY3Ti tetrahedra that share  a cornercorner with one O(19)Y2Ti2 tetrahedra,  a cornercorner with one O(7)Y2Ti2 tetrahedra, corners with two equivalent O(8)Y2Ti2 tetrahedra, corners with two equivalent O(28)Y3Ti tetrahedra,  a cornercorner with one O(12)YTi3 trigonal pyramid, corners with two equivalent O(6)YTi3 trigonal pyramids,  an edgeedge with one O(13)Y2Ti2 tetrahedra,  an edgeedge with one O(2)Y3Ti tetrahedra,  an edgeedge with one O(24)Y3Ti tetrahedra, and  an edgeedge with one O(27)YTi3 trigonal pyramid. In the sixth O site, O(6) is bonded to one Y(4), one Ti(1), one Ti(3), and one Ti(5) atom to form OYTi3 trigonal pyramids that share  a cornercorner with one O(13)Y2Ti2 tetrahedra,  a cornercorner with one O(8)Y2Ti2 tetrahedra,  a cornercorner with one O(28)Y3Ti tetrahedra, corners with two equivalent O(5)Y3Ti tetrahedra,  an edgeedge with one O(24)Y3Ti tetrahedra, and  an edgeedge with one O(27)YTi3 trigonal pyramid. In the seventh O site, O(7) is bonded to one Y(2), one Y(3), one Ti(13), and one Ti(6) atom to form OY2Ti2 tetrahedra that share  a cornercorner with one O(28)Y3Ti tetrahedra,  a cornercorner with one O(5)Y3Ti tetrahedra, corners with two equivalent O(13)Y2Ti2 tetrahedra, corners with two equivalent O(2)Y3Ti tetrahedra,  a cornercorner with one O(1)YTi3 trigonal pyramid,  a cornercorner with one O(27)YTi3 trigonal pyramid,  an edgeedge with one O(8)Y2Ti2 tetrahedra,  an edgeedge with one O(24)Y3Ti tetrahedra, and edges with two equivalent O(19)Y2Ti2 tetrahedra. In the eighth O site, O(8) is bonded to one Y(1), one Y(4), one Ti(13), and one Ti(6) atom to form OY2Ti2 tetrahedra that share  a cornercorner with one O(2)Y3Ti tetrahedra,  a cornercorner with one O(24)Y3Ti tetrahedra, corners with two equivalent O(19)Y2Ti2 tetrahedra, corners with two equivalent O(5)Y3Ti tetrahedra,  a cornercorner with one O(12)YTi3 trigonal pyramid,  a cornercorner with one O(6)YTi3 trigonal pyramid,  an edgeedge with one O(7)Y2Ti2 tetrahedra,  an edgeedge with one O(28)Y3Ti tetrahedra, and edges with two equivalent O(13)Y2Ti2 tetrahedra. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Ti(8), one Ti(9), and one Si(2) atom. In the tenth O site, O(10) is bonded to one Ti(7), one Ti(8), one Ti(9), and one Sb(1) atom to form distorted OTi3Sb tetrahedra that share  a cornercorner with one O(18)Ti3Sb tetrahedra and  a cornercorner with one O(12)YTi3 trigonal pyramid. In the eleventh O site, O(11) is bonded in a distorted T-shaped geometry to one Ti(2), one Ti(4), and one Si(1) atom. In the twelfth O site, O(12) is bonded to one Y(1), one Ti(11), one Ti(4), and one Ti(7) atom to form distorted OYTi3 trigonal pyramids that share  a cornercorner with one O(10)Ti3Sb tetrahedra,  a cornercorner with one O(13)Y2Ti2 tetrahedra,  a cornercorner with one O(8)Y2Ti2 tetrahedra,  a cornercorner with one O(5)Y3Ti tetrahedra, corners with two equivalent O(28)Y3Ti tetrahedra,  an edgeedge with one O(2)Y3Ti tetrahedra, and  an edgeedge with one O(1)YTi3 trigonal pyramid. In the thirteenth O site, O(13) is bonded to one Y(1), one Y(4), one Ti(13), and one Ti(6) atom to form distorted OY2Ti2 tetrahedra that share  a cornercorner with one O(2)Y3Ti tetrahedra,  a cornercorner with one O(24)Y3Ti tetrahedra, corners with two equivalent O(7)Y2Ti2 tetrahedra, corners with two equivalent O(28)Y3Ti tetrahedra,  a cornercorner with one O(12)YTi3 trigonal pyramid,  a cornercorner with one O(6)YTi3 trigonal pyramid,  an edgeedge with one O(19)Y2Ti2 tetrahedra,  an edgeedge with one O(5)Y3Ti tetrahedra, and edges with two equivalent O(8)Y2Ti2 tetrahedra. In the fourteenth O site, O(14) is bonded in a trigonal planar geometry to one Ti(2), one Ti(8), and one Ti(9) atom. In the fifteenth O site, O(15) is bonded in a 4-coordinate geometry to one Ti(11), one Ti(2), one Ti(7), and one Si(2) atom. In the sixteenth O site, O(16) is bonded in a trigonal non-coplanar geometry to one Ti(5), one Ti(7), and one Si(2) atom. In the seventeenth O site, O(17) is bonded in a distorted trigonal planar geometry to one Ti(12), one Ti(5), and one Ti(8) atom. In the eighteenth O site, O(18) is bonded to one Ti(10), one Ti(12), one Ti(8), and one Sb(2) atom to form distorted OTi3Sb tetrahedra that share  a cornercorner with one O(10)Ti3Sb tetrahedra and  a cornercorner with one O(27)YTi3 trigonal pyramid. In the nineteenth O site, O(19) is bonded to one Y(2), one Y(3), one Ti(13), and one Ti(6) atom to form distorted OY2Ti2 tetrahedra that share  a cornercorner with one O(28)Y3Ti tetrahedra,  a cornercorner with one O(5)Y3Ti tetrahedra, corners with two equivalent O(8)Y2Ti2 tetrahedra, corners with two equivalent O(24)Y3Ti tetrahedra,  a cornercorner with one O(1)YTi3 trigonal pyramid,  a cornercorner with one O(27)YTi3 trigonal pyramid,  an edgeedge with one O(13)Y2Ti2 tetrahedra,  an edgeedge with one O(2)Y3Ti tetrahedra, and edges with two equivalent O(7)Y2Ti2 tetrahedra. In the twentieth O site, O(20) is bonded in a 3-coordinate geometry to one Ti(4), one Ti(6), and one Ti(9) atom. In the twenty-first O site, O(21) is bonded in a 3-coordinate geometry to one Y(4), one Ti(1), one Ti(12), and one Ti(13) atom. In the twenty-second O site, O(22) is bonded in a 4-coordinate geometry to one Ti(10), one Ti(3), one Ti(5), and one Si(1) atom. In the twenty-third O site, O(23) is bonded in a trigonal planar geometry to one Ti(12), one Ti(13), and one Ti(3) atom. In the twenty-fourth O site, O(24) is bonded to one Y(2), one Y(3), one Y(4), and one Ti(3) atom to form distorted OY3Ti tetrahedra that share  a cornercorner with one O(13)Y2Ti2 tetrahedra,  a cornercorner with one O(8)Y2Ti2 tetrahedra, corners with two equivalent O(19)Y2Ti2 tetrahedra, corners with two equivalent O(2)Y3Ti tetrahedra,  a cornercorner with one O(1)YTi3 trigonal pyramid, corners with two equivalent O(27)YTi3 trigonal pyramids,  an edgeedge with one O(7)Y2Ti2 tetrahedra,  an edgeedge with one O(28)Y3Ti tetrahedra,  an edgeedge with one O(5)Y3Ti tetrahedra, and  an edgeedge with one O(6)YTi3 trigonal pyramid. In the twenty-fifth O site, O(25) is bonded in a distorted T-shaped geometry to one Ti(1), one Ti(5), and one Si(2) atom. In the twenty-sixth O site, O(26) is bonded in a distorted trigonal planar geometry to one Ti(11), one Ti(6), and one Ti(9) atom. In the twenty-seventh O site, O(27) is bonded to one Y(3), one Ti(1), one Ti(10), and one Ti(3) atom to form distorted OYTi3 trigonal pyramids that share  a cornercorner with one O(18)Ti3Sb tetrahedra,  a cornercorner with one O(19)Y2Ti2 tetrahedra,  a cornercorner with one O(7)Y2Ti2 tetrahedra,  a cornercorner with one O(2)Y3Ti tetrahedra, corners with two equivalent O(24)Y3Ti tetrahedra,  an edgeedge with one O(5)Y3Ti tetrahedra, and  an edgeedge with one O(6)YTi3 trigonal pyramid. In the twenty-eighth O site, O(28) is bonded to one Y(1), one Y(2), one Y(4), and one Ti(11) atom to form distorted OY3Ti tetrahedra that share  a cornercorner with one O(19)Y2Ti2 tetrahedra,  a cornercorner with one O(7)Y2Ti2 tetrahedra, corners with two equivalent O(13)Y2Ti2 tetrahedra, corners with two equivalent O(5)Y3Ti tetrahedra,  a cornercorner with one O(6)YTi3 trigonal pyramid, corners with two equivalent O(12)YTi3 trigonal pyramids,  an edgeedge with one O(8)Y2Ti2 tetrahedra,  an edgeedge with one O(2)Y3Ti tetrahedra,  an edgeedge with one O(24)Y3Ti tetrahedra, and  an edgeedge with one O(1)YTi3 trigonal pyramid.
Y4Ti13Si2(SbO14)2 crystallizes in the triclinic P1 space group. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded in a 6-coordinate geometry to one O(12), one O(13), one O(2), one O(28), one O(5), and one O(8) atom. The Y(1)-O(12) bond length is 2.39 Å. The Y(1)-O(13) bond length is 2.32 Å. The Y(1)-O(2) bond length is 2.30 Å. The Y(1)-O(28) bond length is 2.38 Å. The Y(1)-O(5) bond length is 2.33 Å. The Y(1)-O(8) bond length is 2.26 Å. In the second Y site, Y(2) is bonded in a 6-coordinate geometry to one O(1), one O(19), one O(2), one O(24), one O(28), and one O(7) atom. The Y(2)-O(1) bond length is 2.36 Å. The Y(2)-O(19) bond length is 2.24 Å. The Y(2)-O(2) bond length is 2.38 Å. The Y(2)-O(24) bond length is 2.40 Å. The Y(2)-O(28) bond length is 2.44 Å. The Y(2)-O(7) bond length is 2.33 Å. In the third Y site, Y(3) is bonded in a 6-coordinate geometry to one O(19), one O(2), one O(24), one O(27), one O(5), and one O(7) atom. The Y(3)-O(19) bond length is 2.33 Å. The Y(3)-O(2) bond length is 2.32 Å. The Y(3)-O(24) bond length is 2.38 Å. The Y(3)-O(27) bond length is 2.39 Å. The Y(3)-O(5) bond length is 2.30 Å. The Y(3)-O(7) bond length is 2.27 Å. In the fourth Y site, Y(4) is bonded in a 7-coordinate geometry to one O(13), one O(21), one O(24), one O(28), one O(5), one O(6), and one O(8) atom. The Y(4)-O(13) bond length is 2.24 Å. The Y(4)-O(21) bond length is 2.85 Å. The Y(4)-O(24) bond length is 2.44 Å. The Y(4)-O(28) bond length is 2.40 Å. The Y(4)-O(5) bond length is 2.38 Å. The Y(4)-O(6) bond length is 2.36 Å. The Y(4)-O(8) bond length is 2.34 Å. There are thirteen inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(21), one O(25), one O(27), one O(5), and one O(6) atom to form TiO5 trigonal bipyramids that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Ti(12)O5 trigonal bipyramid, corners with two equivalent Ti(5)O5 trigonal bipyramids, and  an edgeedge with one Ti(3)O5 trigonal bipyramid. The Ti(1)-O(21) bond length is 1.99 Å. The Ti(1)-O(25) bond length is 2.03 Å. The Ti(1)-O(27) bond length is 2.08 Å. The Ti(1)-O(5) bond length is 1.90 Å. The Ti(1)-O(6) bond length is 2.04 Å. In the second Ti site, Ti(2) is bonded to one O(1), one O(11), one O(14), one O(15), and one O(3) atom to form distorted TiO5 trigonal bipyramids that share  a cornercorner with one Ti(8)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra,  a cornercorner with one Ti(9)O5 trigonal bipyramid, corners with two equivalent Ti(4)O5 trigonal bipyramids, and  an edgeedge with one Ti(11)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 48°. The Ti(2)-O(1) bond length is 1.92 Å. The Ti(2)-O(11) bond length is 2.06 Å. The Ti(2)-O(14) bond length is 1.93 Å. The Ti(2)-O(15) bond length is 2.23 Å. The Ti(2)-O(3) bond length is 2.13 Å. In the third Ti site, Ti(3) is bonded to one O(22), one O(23), one O(24), one O(27), and one O(6) atom to form distorted TiO5 trigonal bipyramids that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Ti(12)O5 trigonal bipyramid,  an edgeedge with one Ti(1)O5 trigonal bipyramid, and  an edgeedge with one Ti(5)O5 trigonal bipyramid. The Ti(3)-O(22) bond length is 2.12 Å. The Ti(3)-O(23) bond length is 2.00 Å. The Ti(3)-O(24) bond length is 1.86 Å. The Ti(3)-O(27) bond length is 2.03 Å. The Ti(3)-O(6) bond length is 2.24 Å. In the fourth Ti site, Ti(4) is bonded to one O(1), one O(11), one O(12), one O(2), and one O(20) atom to form TiO5 trigonal bipyramids that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Ti(9)O5 trigonal bipyramid, corners with two equivalent Ti(2)O5 trigonal bipyramids, and  an edgeedge with one Ti(11)O5 trigonal bipyramid. The Ti(4)-O(1) bond length is 2.03 Å. The Ti(4)-O(11) bond length is 2.03 Å. The Ti(4)-O(12) bond length is 2.08 Å. The Ti(4)-O(2) bond length is 1.90 Å. The Ti(4)-O(20) bond length is 1.99 Å. In the fifth Ti site, Ti(5) is bonded to one O(16), one O(17), one O(22), one O(25), and one O(6) atom to form distorted TiO5 trigonal bipyramids that share  a cornercorner with one Ti(8)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra,  a cornercorner with one Ti(12)O5 trigonal bipyramid, corners with two equivalent Ti(1)O5 trigonal bipyramids, and  an edgeedge with one Ti(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 44°. The Ti(5)-O(16) bond length is 2.14 Å. The Ti(5)-O(17) bond length is 1.92 Å. The Ti(5)-O(22) bond length is 2.22 Å. The Ti(5)-O(25) bond length is 2.07 Å. The Ti(5)-O(6) bond length is 1.92 Å. In the sixth Ti site, Ti(6) is bonded in a 6-coordinate geometry to one O(13), one O(19), one O(20), one O(26), one O(7), and one O(8) atom. The Ti(6)-O(13) bond length is 2.40 Å. The Ti(6)-O(19) bond length is 1.99 Å. The Ti(6)-O(20) bond length is 2.19 Å. The Ti(6)-O(26) bond length is 2.01 Å. The Ti(6)-O(7) bond length is 2.29 Å. The Ti(6)-O(8) bond length is 1.99 Å. In the seventh Ti site, Ti(7) is bonded in a distorted rectangular see-saw-like geometry to one O(10), one O(12), one O(15), and one O(16) atom. The Ti(7)-O(10) bond length is 2.10 Å. The Ti(7)-O(12) bond length is 1.93 Å. The Ti(7)-O(15) bond length is 2.18 Å. The Ti(7)-O(16) bond length is 2.17 Å. In the eighth Ti site, Ti(8) is bonded to one O(10), one O(14), one O(17), one O(18), one O(4), and one O(9) atom to form TiO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Ti(12)O5 trigonal bipyramid,  a cornercorner with one Ti(2)O5 trigonal bipyramid,  a cornercorner with one Ti(5)O5 trigonal bipyramid,  a cornercorner with one Ti(9)O5 trigonal bipyramid,  an edgeedge with one Ti(12)O5 trigonal bipyramid, and  an edgeedge with one Ti(9)O5 trigonal bipyramid. The Ti(8)-O(10) bond length is 2.26 Å. The Ti(8)-O(14) bond length is 2.00 Å. The Ti(8)-O(17) bond length is 1.99 Å. The Ti(8)-O(18) bond length is 2.17 Å. The Ti(8)-O(4) bond length is 2.15 Å. The Ti(8)-O(9) bond length is 2.17 Å. In the ninth Ti site, Ti(9) is bonded to one O(10), one O(14), one O(20), one O(26), and one O(9) atom to form distorted TiO5 trigonal bipyramids that share  a cornercorner with one Ti(8)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Ti(11)O5 trigonal bipyramid,  a cornercorner with one Ti(2)O5 trigonal bipyramid,  a cornercorner with one Ti(4)O5 trigonal bipyramid, and  an edgeedge with one Ti(8)O6 octahedra. The corner-sharing octahedral tilt angles are 49°. The Ti(9)-O(10) bond length is 2.14 Å. The Ti(9)-O(14) bond length is 2.07 Å. The Ti(9)-O(20) bond length is 1.99 Å. The Ti(9)-O(26) bond length is 2.00 Å. The Ti(9)-O(9) bond length is 2.05 Å. In the tenth Ti site, Ti(10) is bonded in a distorted rectangular see-saw-like geometry to one O(18), one O(22), one O(27), and one O(3) atom. The Ti(10)-O(18) bond length is 2.12 Å. The Ti(10)-O(22) bond length is 2.18 Å. The Ti(10)-O(27) bond length is 1.93 Å. The Ti(10)-O(3) bond length is 2.19 Å. In the eleventh Ti site, Ti(11) is bonded to one O(1), one O(12), one O(15), one O(26), and one O(28) atom to form distorted TiO5 trigonal bipyramids that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Ti(9)O5 trigonal bipyramid,  an edgeedge with one Ti(2)O5 trigonal bipyramid, and  an edgeedge with one Ti(4)O5 trigonal bipyramid. The Ti(11)-O(1) bond length is 2.23 Å. The Ti(11)-O(12) bond length is 2.03 Å. The Ti(11)-O(15) bond length is 2.12 Å. The Ti(11)-O(26) bond length is 2.00 Å. The Ti(11)-O(28) bond length is 1.86 Å. In the twelfth Ti site, Ti(12) is bonded to one O(17), one O(18), one O(21), one O(23), and one O(4) atom to form distorted TiO5 trigonal bipyramids that share  a cornercorner with one Ti(8)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Ti(1)O5 trigonal bipyramid,  a cornercorner with one Ti(3)O5 trigonal bipyramid,  a cornercorner with one Ti(5)O5 trigonal bipyramid, and  an edgeedge with one Ti(8)O6 octahedra. The corner-sharing octahedral tilt angles are 46°. The Ti(12)-O(17) bond length is 2.06 Å. The Ti(12)-O(18) bond length is 2.14 Å. The Ti(12)-O(21) bond length is 2.01 Å. The Ti(12)-O(23) bond length is 2.01 Å. The Ti(12)-O(4) bond length is 2.06 Å. In the thirteenth Ti site, Ti(13) is bonded in a 6-coordinate geometry to one O(13), one O(19), one O(21), one O(23), one O(7), and one O(8) atom. The Ti(13)-O(13) bond length is 1.98 Å. The Ti(13)-O(19) bond length is 2.38 Å. The Ti(13)-O(21) bond length is 2.19 Å. The Ti(13)-O(23) bond length is 2.01 Å. The Ti(13)-O(7) bond length is 1.98 Å. The Ti(13)-O(8) bond length is 2.29 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(11), one O(22), one O(3), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Ti(8)O6 octahedra,  a cornercorner with one Ti(12)O5 trigonal bipyramid,  a cornercorner with one Ti(3)O5 trigonal bipyramid,  a cornercorner with one Ti(4)O5 trigonal bipyramid,  a cornercorner with one Ti(5)O5 trigonal bipyramid, and corners with two equivalent Ti(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 58°. The Si(1)-O(11) bond length is 1.64 Å. The Si(1)-O(22) bond length is 1.69 Å. The Si(1)-O(3) bond length is 1.65 Å. The Si(1)-O(4) bond length is 1.64 Å. In the second Si site, Si(2) is bonded to one O(15), one O(16), one O(25), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Ti(8)O6 octahedra,  a cornercorner with one Ti(1)O5 trigonal bipyramid,  a cornercorner with one Ti(11)O5 trigonal bipyramid,  a cornercorner with one Ti(2)O5 trigonal bipyramid,  a cornercorner with one Ti(9)O5 trigonal bipyramid, and corners with two equivalent Ti(5)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 57°. The Si(2)-O(15) bond length is 1.69 Å. The Si(2)-O(16) bond length is 1.65 Å. The Si(2)-O(25) bond length is 1.64 Å. The Si(2)-O(9) bond length is 1.64 Å. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a single-bond geometry to one O(10) atom. The Sb(1)-O(10) bond length is 2.15 Å. In the second Sb site, Sb(2) is bonded in a single-bond geometry to one O(18) atom. The Sb(2)-O(18) bond length is 2.15 Å. There are twenty-eight inequivalent O sites. In the first O site, O(1) is bonded to one Y(2), one Ti(11), one Ti(2), and one Ti(4) atom to form OYTi3 trigonal pyramids that share  a cornercorner with one O(19)Y2Ti2 tetrahedra,  a cornercorner with one O(7)Y2Ti2 tetrahedra,  a cornercorner with one O(24)Y3Ti tetrahedra, corners with two equivalent O(2)Y3Ti tetrahedra,  an edgeedge with one O(28)Y3Ti tetrahedra, and  an edgeedge with one O(12)YTi3 trigonal pyramid. In the second O site, O(2) is bonded to one Y(1), one Y(2), one Y(3), and one Ti(4) atom to form OY3Ti tetrahedra that share  a cornercorner with one O(13)Y2Ti2 tetrahedra,  a cornercorner with one O(8)Y2Ti2 tetrahedra, corners with two equivalent O(7)Y2Ti2 tetrahedra, corners with two equivalent O(24)Y3Ti tetrahedra,  a cornercorner with one O(27)YTi3 trigonal pyramid, corners with two equivalent O(1)YTi3 trigonal pyramids,  an edgeedge with one O(19)Y2Ti2 tetrahedra,  an edgeedge with one O(28)Y3Ti tetrahedra,  an edgeedge with one O(5)Y3Ti tetrahedra, and  an edgeedge with one O(12)YTi3 trigonal pyramid. In the third O site, O(3) is bonded in a trigonal non-coplanar geometry to one Ti(10), one Ti(2), and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Ti(12), one Ti(8), and one Si(1) atom. In the fifth O site, O(5) is bonded to one Y(1), one Y(3), one Y(4), and one Ti(1) atom to form OY3Ti tetrahedra that share  a cornercorner with one O(19)Y2Ti2 tetrahedra,  a cornercorner with one O(7)Y2Ti2 tetrahedra, corners with two equivalent O(8)Y2Ti2 tetrahedra, corners with two equivalent O(28)Y3Ti tetrahedra,  a cornercorner with one O(12)YTi3 trigonal pyramid, corners with two equivalent O(6)YTi3 trigonal pyramids,  an edgeedge with one O(13)Y2Ti2 tetrahedra,  an edgeedge with one O(2)Y3Ti tetrahedra,  an edgeedge with one O(24)Y3Ti tetrahedra, and  an edgeedge with one O(27)YTi3 trigonal pyramid. In the sixth O site, O(6) is bonded to one Y(4), one Ti(1), one Ti(3), and one Ti(5) atom to form OYTi3 trigonal pyramids that share  a cornercorner with one O(13)Y2Ti2 tetrahedra,  a cornercorner with one O(8)Y2Ti2 tetrahedra,  a cornercorner with one O(28)Y3Ti tetrahedra, corners with two equivalent O(5)Y3Ti tetrahedra,  an edgeedge with one O(24)Y3Ti tetrahedra, and  an edgeedge with one O(27)YTi3 trigonal pyramid. In the seventh O site, O(7) is bonded to one Y(2), one Y(3), one Ti(13), and one Ti(6) atom to form OY2Ti2 tetrahedra that share  a cornercorner with one O(28)Y3Ti tetrahedra,  a cornercorner with one O(5)Y3Ti tetrahedra, corners with two equivalent O(13)Y2Ti2 tetrahedra, corners with two equivalent O(2)Y3Ti tetrahedra,  a cornercorner with one O(1)YTi3 trigonal pyramid,  a cornercorner with one O(27)YTi3 trigonal pyramid,  an edgeedge with one O(8)Y2Ti2 tetrahedra,  an edgeedge with one O(24)Y3Ti tetrahedra, and edges with two equivalent O(19)Y2Ti2 tetrahedra. In the eighth O site, O(8) is bonded to one Y(1), one Y(4), one Ti(13), and one Ti(6) atom to form OY2Ti2 tetrahedra that share  a cornercorner with one O(2)Y3Ti tetrahedra,  a cornercorner with one O(24)Y3Ti tetrahedra, corners with two equivalent O(19)Y2Ti2 tetrahedra, corners with two equivalent O(5)Y3Ti tetrahedra,  a cornercorner with one O(12)YTi3 trigonal pyramid,  a cornercorner with one O(6)YTi3 trigonal pyramid,  an edgeedge with one O(7)Y2Ti2 tetrahedra,  an edgeedge with one O(28)Y3Ti tetrahedra, and edges with two equivalent O(13)Y2Ti2 tetrahedra. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Ti(8), one Ti(9), and one Si(2) atom. In the tenth O site, O(10) is bonded to one Ti(7), one Ti(8), one Ti(9), and one Sb(1) atom to form distorted OTi3Sb tetrahedra that share  a cornercorner with one O(18)Ti3Sb tetrahedra and  a cornercorner with one O(12)YTi3 trigonal pyramid. In the eleventh O site, O(11) is bonded in a distorted T-shaped geometry to one Ti(2), one Ti(4), and one Si(1) atom. In the twelfth O site, O(12) is bonded to one Y(1), one Ti(11), one Ti(4), and one Ti(7) atom to form distorted OYTi3 trigonal pyramids that share  a cornercorner with one O(10)Ti3Sb tetrahedra,  a cornercorner with one O(13)Y2Ti2 tetrahedra,  a cornercorner with one O(8)Y2Ti2 tetrahedra,  a cornercorner with one O(5)Y3Ti tetrahedra, corners with two equivalent O(28)Y3Ti tetrahedra,  an edgeedge with one O(2)Y3Ti tetrahedra, and  an edgeedge with one O(1)YTi3 trigonal pyramid. In the thirteenth O site, O(13) is bonded to one Y(1), one Y(4), one Ti(13), and one Ti(6) atom to form distorted OY2Ti2 tetrahedra that share  a cornercorner with one O(2)Y3Ti tetrahedra,  a cornercorner with one O(24)Y3Ti tetrahedra, corners with two equivalent O(7)Y2Ti2 tetrahedra, corners with two equivalent O(28)Y3Ti tetrahedra,  a cornercorner with one O(12)YTi3 trigonal pyramid,  a cornercorner with one O(6)YTi3 trigonal pyramid,  an edgeedge with one O(19)Y2Ti2 tetrahedra,  an edgeedge with one O(5)Y3Ti tetrahedra, and edges with two equivalent O(8)Y2Ti2 tetrahedra. In the fourteenth O site, O(14) is bonded in a trigonal planar geometry to one Ti(2), one Ti(8), and one Ti(9) atom. In the fifteenth O site, O(15) is bonded in a 4-coordinate geometry to one Ti(11), one Ti(2), one Ti(7), and one Si(2) atom. In the sixteenth O site, O(16) is bonded in a trigonal non-coplanar geometry to one Ti(5), one Ti(7), and one Si(2) atom. In the seventeenth O site, O(17) is bonded in a distorted trigonal planar geometry to one Ti(12), one Ti(5), and one Ti(8) atom. In the eighteenth O site, O(18) is bonded to one Ti(10), one Ti(12), one Ti(8), and one Sb(2) atom to form distorted OTi3Sb tetrahedra that share  a cornercorner with one O(10)Ti3Sb tetrahedra and  a cornercorner with one O(27)YTi3 trigonal pyramid. In the nineteenth O site, O(19) is bonded to one Y(2), one Y(3), one Ti(13), and one Ti(6) atom to form distorted OY2Ti2 tetrahedra that share  a cornercorner with one O(28)Y3Ti tetrahedra,  a cornercorner with one O(5)Y3Ti tetrahedra, corners with two equivalent O(8)Y2Ti2 tetrahedra, corners with two equivalent O(24)Y3Ti tetrahedra,  a cornercorner with one O(1)YTi3 trigonal pyramid,  a cornercorner with one O(27)YTi3 trigonal pyramid,  an edgeedge with one O(13)Y2Ti2 tetrahedra,  an edgeedge with one O(2)Y3Ti tetrahedra, and edges with two equivalent O(7)Y2Ti2 tetrahedra. In the twentieth O site, O(20) is bonded in a 3-coordinate geometry to one Ti(4), one Ti(6), and one Ti(9) atom. In the twenty-first O site, O(21) is bonded in a 3-coordinate geometry to one Y(4), one Ti(1), one Ti(12), and one Ti(13) atom. In the twenty-second O site, O(22) is bonded in a 4-coordinate geometry to one Ti(10), one Ti(3), one Ti(5), and one Si(1) atom. In the twenty-third O site, O(23) is bonded in a trigonal planar geometry to one Ti(12), one Ti(13), and one Ti(3) atom. In the twenty-fourth O site, O(24) is bonded to one Y(2), one Y(3), one Y(4), and one Ti(3) atom to form distorted OY3Ti tetrahedra that share  a cornercorner with one O(13)Y2Ti2 tetrahedra,  a cornercorner with one O(8)Y2Ti2 tetrahedra, corners with two equivalent O(19)Y2Ti2 tetrahedra, corners with two equivalent O(2)Y3Ti tetrahedra,  a cornercorner with one O(1)YTi3 trigonal pyramid, corners with two equivalent O(27)YTi3 trigonal pyramids,  an edgeedge with one O(7)Y2Ti2 tetrahedra,  an edgeedge with one O(28)Y3Ti tetrahedra,  an edgeedge with one O(5)Y3Ti tetrahedra, and  an edgeedge with one O(6)YTi3 trigonal pyramid. In the twenty-fifth O site, O(25) is bonded in a distorted T-shaped geometry to one Ti(1), one Ti(5), and one Si(2) atom. In the twenty-sixth O site, O(26) is bonded in a distorted trigonal planar geometry to one Ti(11), one Ti(6), and one Ti(9) atom. In the twenty-seventh O site, O(27) is bonded to one Y(3), one Ti(1), one Ti(10), and one Ti(3) atom to form distorted OYTi3 trigonal pyramids that share  a cornercorner with one O(18)Ti3Sb tetrahedra,  a cornercorner with one O(19)Y2Ti2 tetrahedra,  a cornercorner with one O(7)Y2Ti2 tetrahedra,  a cornercorner with one O(2)Y3Ti tetrahedra, corners with two equivalent O(24)Y3Ti tetrahedra,  an edgeedge with one O(5)Y3Ti tetrahedra, and  an edgeedge with one O(6)YTi3 trigonal pyramid. In the twenty-eighth O site, O(28) is bonded to one Y(1), one Y(2), one Y(4), and one Ti(11) atom to form distorted OY3Ti tetrahedra that share  a cornercorner with one O(19)Y2Ti2 tetrahedra,  a cornercorner with one O(7)Y2Ti2 tetrahedra, corners with two equivalent O(13)Y2Ti2 tetrahedra, corners with two equivalent O(5)Y3Ti tetrahedra,  a cornercorner with one O(6)YTi3 trigonal pyramid, corners with two equivalent O(12)YTi3 trigonal pyramids,  an edgeedge with one O(8)Y2Ti2 tetrahedra,  an edgeedge with one O(2)Y3Ti tetrahedra,  an edgeedge with one O(24)Y3Ti tetrahedra, and  an edgeedge with one O(1)YTi3 trigonal pyramid.