Sr2YCo2AlO7 crystallizes in the orthorhombic Ima2 space group. Sr(1) is bonded in a 8-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), and three equivalent O(4) atoms. Y(1) is bonded in a distorted body-centered cubic geometry to four equivalent O(2) and four equivalent O(3) atoms. Co(1) is bonded to one O(4), two equivalent O(2), and two equivalent O(3) atoms to form CoO5 trigonal bipyramids that share  a cornercorner with one Al(1)O4 tetrahedra and corners with four equivalent Co(1)O5 trigonal bipyramids. Al(1) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(1)O4 tetrahedra and corners with two equivalent Co(1)O5 trigonal bipyramids. There are four inequivalent O sites. In the first O site, O(4) is bonded in a 5-coordinate geometry to three equivalent Sr(1), one Co(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 corner-sharing OSr2Al2 tetrahedra. In the third O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Y(1), and two equivalent Co(1) atoms. In the fourth O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Y(1), and two equivalent Co(1) atoms.
Sr2YCo2AlO7 crystallizes in the orthorhombic Ima2 space group. Sr(1) is bonded in a 8-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), and three equivalent O(4) atoms. The Sr(1)-O(1) bond length is 2.56 Å. There is one shorter (2.62 Å) and one longer (2.84 Å) Sr(1)-O(2) bond length. There is one shorter (2.61 Å) and one longer (3.04 Å) Sr(1)-O(3) bond length. There are a spread of Sr(1)-O(4) bond distances ranging from 2.46-3.03 Å. Y(1) is bonded in a distorted body-centered cubic geometry to four equivalent O(2) and four equivalent O(3) atoms. There are two shorter (2.30 Å) and two longer (2.61 Å) Y(1)-O(2) bond lengths. There are two shorter (2.31 Å) and two longer (2.72 Å) Y(1)-O(3) bond lengths. Co(1) is bonded to one O(4), two equivalent O(2), and two equivalent O(3) atoms to form CoO5 trigonal bipyramids that share  a cornercorner with one Al(1)O4 tetrahedra and corners with four equivalent Co(1)O5 trigonal bipyramids. The Co(1)-O(4) bond length is 2.21 Å. There is one shorter (2.02 Å) and one longer (2.09 Å) Co(1)-O(2) bond length. There is one shorter (2.01 Å) and one longer (2.02 Å) Co(1)-O(3) bond length. Al(1) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(1)O4 tetrahedra and corners with two equivalent Co(1)O5 trigonal bipyramids. There is one shorter (1.81 Å) and one longer (1.82 Å) Al(1)-O(1) bond length. 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 5-coordinate geometry to three equivalent Sr(1), one Co(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 corner-sharing OSr2Al2 tetrahedra. In the third O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Y(1), and two equivalent Co(1) atoms. In the fourth O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Y(1), and two equivalent Co(1) atoms.