YSn2BiO7 crystallizes in the orthorhombic Imma space group. Y(1) is bonded in a distorted body-centered cubic geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(4) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to two equivalent O(3) and four equivalent O(4) atoms to form corner-sharing SnO6 octahedra. The corner-sharing octahedral tilt angles are 52°. In the second Sn site, Sn(2) is bonded to two equivalent O(2) and four equivalent O(4) atoms to form corner-sharing SnO6 octahedra. The corner-sharing octahedral tilt angles range from 51-52°. Bi(1) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(2), and four equivalent O(4) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Y(1) and two equivalent Bi(1) atoms to form OY2Bi2 tetrahedra that share corners with two equivalent O(2)Sn2Bi2 tetrahedra, corners with two equivalent O(3)Y2Sn2 tetrahedra, corners with four equivalent O(1)Y2Bi2 tetrahedra, corners with eight equivalent O(4)YSn2Bi tetrahedra,  an edgeedge with one O(2)Sn2Bi2 tetrahedra,  an edgeedge with one O(3)Y2Sn2 tetrahedra, and edges with four equivalent O(4)YSn2Bi tetrahedra. In the second O site, O(2) is bonded to two equivalent Sn(2) and two equivalent Bi(1) atoms to form distorted OSn2Bi2 tetrahedra that share corners with two equivalent O(1)Y2Bi2 tetrahedra, corners with four equivalent O(2)Sn2Bi2 tetrahedra, corners with eight equivalent O(4)YSn2Bi tetrahedra,  an edgeedge with one O(1)Y2Bi2 tetrahedra, and edges with four equivalent O(4)YSn2Bi tetrahedra. In the third O site, O(3) is bonded to two equivalent Y(1) and two equivalent Sn(1) atoms to form distorted OY2Sn2 tetrahedra that share corners with two equivalent O(1)Y2Bi2 tetrahedra, corners with four equivalent O(3)Y2Sn2 tetrahedra, corners with eight equivalent O(4)YSn2Bi tetrahedra,  an edgeedge with one O(1)Y2Bi2 tetrahedra, and edges with four equivalent O(4)YSn2Bi tetrahedra. In the fourth O site, O(4) is bonded to one Y(1), one Sn(1), one Sn(2), and one Bi(1) atom to form distorted OYSn2Bi tetrahedra that share corners with two equivalent O(2)Sn2Bi2 tetrahedra, corners with two equivalent O(1)Y2Bi2 tetrahedra, corners with two equivalent O(3)Y2Sn2 tetrahedra, corners with eight equivalent O(4)YSn2Bi tetrahedra,  an edgeedge with one O(2)Sn2Bi2 tetrahedra,  an edgeedge with one O(1)Y2Bi2 tetrahedra,  an edgeedge with one O(3)Y2Sn2 tetrahedra, and edges with two equivalent O(4)YSn2Bi tetrahedra.
YSn2BiO7 crystallizes in the orthorhombic Imma space group. Y(1) is bonded in a distorted body-centered cubic geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(4) atoms. Both Y(1)-O(1) bond lengths are 2.25 Å. Both Y(1)-O(3) bond lengths are 2.56 Å. All Y(1)-O(4) bond lengths are 2.53 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to two equivalent O(3) and four equivalent O(4) atoms to form corner-sharing SnO6 octahedra. The corner-sharing octahedral tilt angles are 52°. Both Sn(1)-O(3) bond lengths are 2.09 Å. All Sn(1)-O(4) bond lengths are 2.09 Å. In the second Sn site, Sn(2) is bonded to two equivalent O(2) and four equivalent O(4) atoms to form corner-sharing SnO6 octahedra. The corner-sharing octahedral tilt angles range from 51-52°. Both Sn(2)-O(2) bond lengths are 2.08 Å. All Sn(2)-O(4) bond lengths are 2.09 Å. Bi(1) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(2), and four equivalent O(4) atoms. Both Bi(1)-O(1) bond lengths are 2.35 Å. Both Bi(1)-O(2) bond lengths are 2.57 Å. All Bi(1)-O(4) bond lengths are 2.60 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Y(1) and two equivalent Bi(1) atoms to form OY2Bi2 tetrahedra that share corners with two equivalent O(2)Sn2Bi2 tetrahedra, corners with two equivalent O(3)Y2Sn2 tetrahedra, corners with four equivalent O(1)Y2Bi2 tetrahedra, corners with eight equivalent O(4)YSn2Bi tetrahedra,  an edgeedge with one O(2)Sn2Bi2 tetrahedra,  an edgeedge with one O(3)Y2Sn2 tetrahedra, and edges with four equivalent O(4)YSn2Bi tetrahedra. In the second O site, O(2) is bonded to two equivalent Sn(2) and two equivalent Bi(1) atoms to form distorted OSn2Bi2 tetrahedra that share corners with two equivalent O(1)Y2Bi2 tetrahedra, corners with four equivalent O(2)Sn2Bi2 tetrahedra, corners with eight equivalent O(4)YSn2Bi tetrahedra,  an edgeedge with one O(1)Y2Bi2 tetrahedra, and edges with four equivalent O(4)YSn2Bi tetrahedra. In the third O site, O(3) is bonded to two equivalent Y(1) and two equivalent Sn(1) atoms to form distorted OY2Sn2 tetrahedra that share corners with two equivalent O(1)Y2Bi2 tetrahedra, corners with four equivalent O(3)Y2Sn2 tetrahedra, corners with eight equivalent O(4)YSn2Bi tetrahedra,  an edgeedge with one O(1)Y2Bi2 tetrahedra, and edges with four equivalent O(4)YSn2Bi tetrahedra. In the fourth O site, O(4) is bonded to one Y(1), one Sn(1), one Sn(2), and one Bi(1) atom to form distorted OYSn2Bi tetrahedra that share corners with two equivalent O(2)Sn2Bi2 tetrahedra, corners with two equivalent O(1)Y2Bi2 tetrahedra, corners with two equivalent O(3)Y2Sn2 tetrahedra, corners with eight equivalent O(4)YSn2Bi tetrahedra,  an edgeedge with one O(2)Sn2Bi2 tetrahedra,  an edgeedge with one O(1)Y2Bi2 tetrahedra,  an edgeedge with one O(3)Y2Sn2 tetrahedra, and edges with two equivalent O(4)YSn2Bi tetrahedra.