Y7O6F9 crystallizes in the orthorhombic Aem2 space group. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded in a 8-coordinate geometry to two equivalent F(3), two equivalent F(4), and four equivalent F(5) atoms. In the second Y site, Y(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent F(2), two equivalent F(3), and two equivalent F(5) atoms. In the third Y site, Y(3) is bonded in a 7-coordinate geometry to two equivalent O(1), two equivalent O(3), one F(2), and two equivalent F(1) atoms. In the fourth Y site, Y(4) is bonded in a 7-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(4), and one F(1) atom. There are four inequivalent O sites. In the first O site, O(3) is bonded to two equivalent Y(3) and two equivalent Y(4) atoms to form a mixture of distorted edge and corner-sharing OY4 tetrahedra. In the second O site, O(4) is bonded to four equivalent Y(4) atoms to form a mixture of edge and corner-sharing OY4 tetrahedra. In the third O site, O(1) is bonded to two equivalent Y(2) and two equivalent Y(3) atoms to form distorted OY4 tetrahedra that share corners with two equivalent O(3)Y4 tetrahedra, corners with two equivalent F(5)Y4 tetrahedra,  an edgeedge with one O(3)Y4 tetrahedra,  an edgeedge with one F(5)Y4 tetrahedra, and edges with two equivalent O(1)Y4 tetrahedra. In the fourth O site, O(2) is bonded to four equivalent Y(4) atoms to form a mixture of edge and corner-sharing OY4 tetrahedra. There are five inequivalent F sites. In the first F site, F(5) is bonded to two equivalent Y(1) and two equivalent Y(2) atoms to form distorted FY4 tetrahedra that share corners with two equivalent O(1)Y4 tetrahedra, corners with two equivalent F(5)Y4 tetrahedra,  an edgeedge with one O(1)Y4 tetrahedra, and edges with three equivalent F(5)Y4 tetrahedra. In the second F site, F(3) is bonded in a distorted trigonal planar geometry to one Y(1) and two equivalent Y(2) atoms. In the third F site, F(1) is bonded in a distorted trigonal planar geometry to one Y(4) and two equivalent Y(3) atoms. In the fourth F site, F(2) is bonded in a distorted trigonal planar geometry to one Y(3) and two equivalent Y(2) atoms. In the fifth F site, F(4) is bonded in a bent 120 degrees geometry to two equivalent Y(1) atoms.
Y7O6F9 crystallizes in the orthorhombic Aem2 space group. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded in a 8-coordinate geometry to two equivalent F(3), two equivalent F(4), and four equivalent F(5) atoms. Both Y(1)-F(3) bond lengths are 2.24 Å. There is one shorter (2.22 Å) and one longer (2.24 Å) Y(1)-F(4) bond length. There are two shorter (2.35 Å) and two longer (2.41 Å) Y(1)-F(5) bond lengths. In the second Y site, Y(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent F(2), two equivalent F(3), and two equivalent F(5) atoms. Both Y(2)-O(1) bond lengths are 2.17 Å. There is one shorter (2.25 Å) and one longer (2.40 Å) Y(2)-F(2) bond length. There is one shorter (2.45 Å) and one longer (2.53 Å) Y(2)-F(3) bond length. There is one shorter (2.61 Å) and one longer (2.72 Å) Y(2)-F(5) bond length. In the third Y site, Y(3) is bonded in a 7-coordinate geometry to two equivalent O(1), two equivalent O(3), one F(2), and two equivalent F(1) atoms. There is one shorter (2.38 Å) and one longer (2.53 Å) Y(3)-O(1) bond length. There is one shorter (2.14 Å) and one longer (2.16 Å) Y(3)-O(3) bond length. The Y(3)-F(2) bond length is 2.43 Å. There is one shorter (2.33 Å) and one longer (2.46 Å) Y(3)-F(1) bond length. In the fourth Y site, Y(4) is bonded in a 7-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(4), and one F(1) atom. There is one shorter (2.27 Å) and one longer (2.35 Å) Y(4)-O(2) bond length. There is one shorter (2.36 Å) and one longer (2.68 Å) Y(4)-O(3) bond length. There is one shorter (2.21 Å) and one longer (2.25 Å) Y(4)-O(4) bond length. The Y(4)-F(1) bond length is 2.41 Å. There are four inequivalent O sites. In the first O site, O(3) is bonded to two equivalent Y(3) and two equivalent Y(4) atoms to form a mixture of distorted edge and corner-sharing OY4 tetrahedra. In the second O site, O(4) is bonded to four equivalent Y(4) atoms to form a mixture of edge and corner-sharing OY4 tetrahedra. In the third O site, O(1) is bonded to two equivalent Y(2) and two equivalent Y(3) atoms to form distorted OY4 tetrahedra that share corners with two equivalent O(3)Y4 tetrahedra, corners with two equivalent F(5)Y4 tetrahedra,  an edgeedge with one O(3)Y4 tetrahedra,  an edgeedge with one F(5)Y4 tetrahedra, and edges with two equivalent O(1)Y4 tetrahedra. In the fourth O site, O(2) is bonded to four equivalent Y(4) atoms to form a mixture of edge and corner-sharing OY4 tetrahedra. There are five inequivalent F sites. In the first F site, F(5) is bonded to two equivalent Y(1) and two equivalent Y(2) atoms to form distorted FY4 tetrahedra that share corners with two equivalent O(1)Y4 tetrahedra, corners with two equivalent F(5)Y4 tetrahedra,  an edgeedge with one O(1)Y4 tetrahedra, and edges with three equivalent F(5)Y4 tetrahedra. In the second F site, F(3) is bonded in a distorted trigonal planar geometry to one Y(1) and two equivalent Y(2) atoms. In the third F site, F(1) is bonded in a distorted trigonal planar geometry to one Y(4) and two equivalent Y(3) atoms. In the fourth F site, F(2) is bonded in a distorted trigonal planar geometry to one Y(3) and two equivalent Y(2) atoms. In the fifth F site, F(4) is bonded in a bent 120 degrees geometry to two equivalent Y(1) atoms.