Sr2YW2AlO7 crystallizes in the orthorhombic Ima2 space group. Sr(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), and two equivalent O(4) atoms. Y(1) is bonded in a 4-coordinate geometry to two equivalent O(2) and two equivalent O(3) atoms. W(1) is bonded in a distorted square co-planar geometry to two equivalent O(2) and two equivalent O(3) atoms. Al(1) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form corner-sharing AlO4 tetrahedra. There are four inequivalent O sites. In the first O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Sr(1) and one Al(1) atom. In the second O site, O(1) is bonded to two equivalent Sr(1) and two equivalent Al(1) atoms to form distorted OSr2Al2 tetrahedra that share corners with two equivalent O(1)Sr2Al2 tetrahedra and corners with two equivalent O(3)SrYW2 trigonal pyramids. In the third O site, O(2) is bonded in a 4-coordinate geometry to one Sr(1), one Y(1), and two equivalent W(1) atoms. In the fourth O site, O(3) is bonded to one Sr(1), one Y(1), and two equivalent W(1) atoms to form distorted OSrYW2 trigonal pyramids that share  a cornercorner with one O(1)Sr2Al2 tetrahedra and corners with three equivalent O(3)SrYW2 trigonal pyramids.
Sr2YW2AlO7 crystallizes in the orthorhombic Ima2 space group. Sr(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), and two equivalent O(4) atoms. The Sr(1)-O(1) bond length is 2.57 Å. The Sr(1)-O(2) bond length is 2.54 Å. The Sr(1)-O(3) bond length is 2.57 Å. There is one shorter (2.44 Å) and one longer (2.60 Å) Sr(1)-O(4) bond length. Y(1) is bonded in a 4-coordinate geometry to two equivalent O(2) and two equivalent O(3) atoms. Both Y(1)-O(2) bond lengths are 2.32 Å. Both Y(1)-O(3) bond lengths are 2.33 Å. W(1) is bonded in a distorted square co-planar geometry to two equivalent O(2) and two equivalent O(3) atoms. There is one shorter (2.11 Å) and one longer (2.13 Å) W(1)-O(2) bond length. There is one shorter (2.12 Å) and one longer (2.13 Å) W(1)-O(3) bond length. Al(1) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form corner-sharing AlO4 tetrahedra. Both Al(1)-O(1) bond lengths are 1.83 Å. Both Al(1)-O(4) bond lengths are 1.76 Å. There are four inequivalent O sites. In the first O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Sr(1) and one Al(1) atom. In the second O site, O(1) is bonded to two equivalent Sr(1) and two equivalent Al(1) atoms to form distorted OSr2Al2 tetrahedra that share corners with two equivalent O(1)Sr2Al2 tetrahedra and corners with two equivalent O(3)SrYW2 trigonal pyramids. In the third O site, O(2) is bonded in a 4-coordinate geometry to one Sr(1), one Y(1), and two equivalent W(1) atoms. In the fourth O site, O(3) is bonded to one Sr(1), one Y(1), and two equivalent W(1) atoms to form distorted OSrYW2 trigonal pyramids that share  a cornercorner with one O(1)Sr2Al2 tetrahedra and corners with three equivalent O(3)SrYW2 trigonal pyramids.