SrYAl3O7 crystallizes in the orthorhombic Cmm2 space group. Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(5), two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms. Y(1) is bonded in a 8-coordinate geometry to one O(2), one O(6), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(2), one O(5), and two equivalent O(3) atoms to form corner-sharing AlO4 tetrahedra. In the second Al site, Al(2) is bonded to one O(1), one O(6), and two equivalent O(4) atoms to form corner-sharing AlO4 tetrahedra. In the third Al site, Al(3) is bonded to two equivalent O(3) and two equivalent O(4) atoms to form corner-sharing AlO4 tetrahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Al(2) atoms. In the second O site, O(2) is bonded to two equivalent Y(1) and two equivalent Al(1) atoms to form a mixture of distorted corner and edge-sharing OY2Al2 tetrahedra. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Sr(1), one Y(1), one Al(1), and one Al(3) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(1), one Y(1), one Al(2), and one Al(3) atom. In the fifth O site, O(5) is bonded to one Sr(1), two equivalent Y(1), and one Al(1) atom to form distorted OSrY2Al tetrahedra that share  a cornercorner with one O(2)Y2Al2 tetrahedra,  an edgeedge with one O(5)SrY2Al tetrahedra, and  an edgeedge with one O(2)Y2Al2 tetrahedra. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Y(1), and one Al(2) atom.
SrYAl3O7 crystallizes in the orthorhombic Cmm2 space group. Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(5), two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms. The Sr(1)-O(1) bond length is 2.58 Å. The Sr(1)-O(5) bond length is 2.64 Å. Both Sr(1)-O(3) bond lengths are 2.55 Å. Both Sr(1)-O(4) bond lengths are 2.92 Å. Both Sr(1)-O(6) bond lengths are 2.73 Å. Y(1) is bonded in a 8-coordinate geometry to one O(2), one O(6), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. The Y(1)-O(2) bond length is 2.38 Å. The Y(1)-O(6) bond length is 2.28 Å. Both Y(1)-O(3) bond lengths are 2.93 Å. Both Y(1)-O(4) bond lengths are 2.38 Å. Both Y(1)-O(5) bond lengths are 2.44 Å. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(2), one O(5), and two equivalent O(3) atoms to form corner-sharing AlO4 tetrahedra. The Al(1)-O(2) bond length is 1.78 Å. The Al(1)-O(5) bond length is 1.76 Å. Both Al(1)-O(3) bond lengths are 1.76 Å. In the second Al site, Al(2) is bonded to one O(1), one O(6), and two equivalent O(4) atoms to form corner-sharing AlO4 tetrahedra. The Al(2)-O(1) bond length is 1.75 Å. The Al(2)-O(6) bond length is 1.74 Å. Both Al(2)-O(4) bond lengths are 1.80 Å. In the third Al site, Al(3) is bonded to two equivalent O(3) and two equivalent O(4) atoms to form corner-sharing AlO4 tetrahedra. Both Al(3)-O(3) bond lengths are 1.76 Å. Both Al(3)-O(4) bond lengths are 1.79 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Al(2) atoms. In the second O site, O(2) is bonded to two equivalent Y(1) and two equivalent Al(1) atoms to form a mixture of distorted corner and edge-sharing OY2Al2 tetrahedra. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Sr(1), one Y(1), one Al(1), and one Al(3) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(1), one Y(1), one Al(2), and one Al(3) atom. In the fifth O site, O(5) is bonded to one Sr(1), two equivalent Y(1), and one Al(1) atom to form distorted OSrY2Al tetrahedra that share  a cornercorner with one O(2)Y2Al2 tetrahedra,  an edgeedge with one O(5)SrY2Al tetrahedra, and  an edgeedge with one O(2)Y2Al2 tetrahedra. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Y(1), and one Al(2) atom.