Y4TiSn3O14 crystallizes in the trigonal R-3m space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a body-centered cubic geometry to two equivalent O(3) and six equivalent O(2) atoms. In the second Y site, Y(2) is bonded in a distorted body-centered cubic geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. Ti(1) is bonded to six equivalent O(1) atoms to form TiO6 octahedra that share corners with six equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles are 49°. Sn(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form SnO6 octahedra that share corners with two equivalent Ti(1)O6 octahedra and corners with four equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-55°. There are three inequivalent O sites. In the first O site, O(3) is bonded to one Y(1) and three equivalent Y(2) atoms to form OY4 tetrahedra that share corners with four equivalent O(3)Y4 tetrahedra, corners with six equivalent O(2)Y2Sn2 tetrahedra, corners with six equivalent O(1)Y2TiSn tetrahedra, edges with three equivalent O(2)Y2Sn2 tetrahedra, and edges with three equivalent O(1)Y2TiSn tetrahedra. In the second O site, O(1) is bonded to two equivalent Y(2), one Ti(1), and one Sn(1) atom to form distorted OY2TiSn tetrahedra that share corners with two equivalent O(3)Y4 tetrahedra, corners with four equivalent O(2)Y2Sn2 tetrahedra, corners with eight equivalent O(1)Y2TiSn tetrahedra,  an edgeedge with one O(3)Y4 tetrahedra, edges with two equivalent O(2)Y2Sn2 tetrahedra, and edges with two equivalent O(1)Y2TiSn tetrahedra. In the third O site, O(2) is bonded to one Y(1), one Y(2), and two equivalent Sn(1) atoms to form OY2Sn2 tetrahedra that share corners with two equivalent O(3)Y4 tetrahedra, corners with four equivalent O(1)Y2TiSn tetrahedra, corners with eight equivalent O(2)Y2Sn2 tetrahedra,  an edgeedge with one O(3)Y4 tetrahedra, edges with two equivalent O(2)Y2Sn2 tetrahedra, and edges with two equivalent O(1)Y2TiSn tetrahedra.
Y4TiSn3O14 crystallizes in the trigonal R-3m space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a body-centered cubic geometry to two equivalent O(3) and six equivalent O(2) atoms. Both Y(1)-O(3) bond lengths are 2.29 Å. All Y(1)-O(2) bond lengths are 2.49 Å. In the second Y site, Y(2) is bonded in a distorted body-centered cubic geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. Both Y(2)-O(2) bond lengths are 2.46 Å. Both Y(2)-O(3) bond lengths are 2.25 Å. All Y(2)-O(1) bond lengths are 2.55 Å. Ti(1) is bonded to six equivalent O(1) atoms to form TiO6 octahedra that share corners with six equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles are 49°. All Ti(1)-O(1) bond lengths are 1.98 Å. Sn(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form SnO6 octahedra that share corners with two equivalent Ti(1)O6 octahedra and corners with four equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-55°. Both Sn(1)-O(1) bond lengths are 2.08 Å. All Sn(1)-O(2) bond lengths are 2.08 Å. There are three inequivalent O sites. In the first O site, O(3) is bonded to one Y(1) and three equivalent Y(2) atoms to form OY4 tetrahedra that share corners with four equivalent O(3)Y4 tetrahedra, corners with six equivalent O(2)Y2Sn2 tetrahedra, corners with six equivalent O(1)Y2TiSn tetrahedra, edges with three equivalent O(2)Y2Sn2 tetrahedra, and edges with three equivalent O(1)Y2TiSn tetrahedra. In the second O site, O(1) is bonded to two equivalent Y(2), one Ti(1), and one Sn(1) atom to form distorted OY2TiSn tetrahedra that share corners with two equivalent O(3)Y4 tetrahedra, corners with four equivalent O(2)Y2Sn2 tetrahedra, corners with eight equivalent O(1)Y2TiSn tetrahedra,  an edgeedge with one O(3)Y4 tetrahedra, edges with two equivalent O(2)Y2Sn2 tetrahedra, and edges with two equivalent O(1)Y2TiSn tetrahedra. In the third O site, O(2) is bonded to one Y(1), one Y(2), and two equivalent Sn(1) atoms to form OY2Sn2 tetrahedra that share corners with two equivalent O(3)Y4 tetrahedra, corners with four equivalent O(1)Y2TiSn tetrahedra, corners with eight equivalent O(2)Y2Sn2 tetrahedra,  an edgeedge with one O(3)Y4 tetrahedra, edges with two equivalent O(2)Y2Sn2 tetrahedra, and edges with two equivalent O(1)Y2TiSn tetrahedra.