Sr2YCr2GaO7 crystallizes in the orthorhombic Ima2 space group. Sr(1) is bonded in a 5-coordinate geometry to one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms. Y(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(4) atoms. Cr(1) is bonded to one O(3), two equivalent O(1), and two equivalent O(4) atoms to form CrO5 square pyramids that share corners with four equivalent Cr(1)O5 square pyramids and  a cornercorner with one Ga(1)O4 tetrahedra. Ga(1) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form GaO4 tetrahedra that share corners with two equivalent Cr(1)O5 square pyramids and corners with two equivalent Ga(1)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Y(1), and two equivalent Cr(1) atoms. In the second O site, O(2) is bonded to two equivalent Sr(1) and two equivalent Ga(1) atoms to form distorted corner-sharing OSr2Ga2 tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Cr(1), and one Ga(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Y(1), and two equivalent Cr(1) atoms.
Sr2YCr2GaO7 crystallizes in the orthorhombic Ima2 space group. Sr(1) is bonded in a 5-coordinate geometry to one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms. The Sr(1)-O(2) bond length is 2.52 Å. The Sr(1)-O(4) bond length is 2.64 Å. There is one shorter (2.65 Å) and one longer (2.99 Å) Sr(1)-O(1) bond length. There is one shorter (2.48 Å) and one longer (2.62 Å) Sr(1)-O(3) bond length. Y(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(4) atoms. There are two shorter (2.26 Å) and two longer (2.74 Å) Y(1)-O(1) bond lengths. There are two shorter (2.25 Å) and two longer (2.83 Å) Y(1)-O(4) bond lengths. Cr(1) is bonded to one O(3), two equivalent O(1), and two equivalent O(4) atoms to form CrO5 square pyramids that share corners with four equivalent Cr(1)O5 square pyramids and  a cornercorner with one Ga(1)O4 tetrahedra. The Cr(1)-O(3) bond length is 2.40 Å. There is one shorter (2.04 Å) and one longer (2.06 Å) Cr(1)-O(1) bond length. Both Cr(1)-O(4) bond lengths are 2.04 Å. Ga(1) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form GaO4 tetrahedra that share corners with two equivalent Cr(1)O5 square pyramids and corners with two equivalent Ga(1)O4 tetrahedra. There is one shorter (1.92 Å) and one longer (1.93 Å) Ga(1)-O(2) bond length. Both Ga(1)-O(3) bond lengths are 1.85 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Y(1), and two equivalent Cr(1) atoms. In the second O site, O(2) is bonded to two equivalent Sr(1) and two equivalent Ga(1) atoms to form distorted corner-sharing OSr2Ga2 tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Cr(1), and one Ga(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Y(1), and two equivalent Cr(1) atoms.