Sr2MgYCrO6 crystallizes in the triclinic P1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 3-coordinate geometry to one O(1), one O(2), one O(3), one O(5), and one O(6) atom. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), and two equivalent O(1) atoms. Mg(1) is bonded to one O(1), one O(2), one O(3), one O(5), and one O(6) atom to form distorted MgO5 square pyramids that share corners with two equivalent Cr(1)O6 octahedra and  a faceface with one Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles are 50°. Y(1) is bonded in a 4-coordinate geometry to one O(1), one O(4), one O(5), and one O(6) atom. Cr(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form distorted CrO6 octahedra that share corners with two equivalent Mg(1)O5 square pyramids and  a faceface with one Mg(1)O5 square pyramid. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Sr(1), two equivalent Sr(2), one Mg(1), one Y(1), and one Cr(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Mg(1), and one Cr(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Mg(1), and one Cr(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(2), one Y(1), and one Cr(1) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Mg(1), one Y(1), and one Cr(1) atom. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Mg(1), one Y(1), and one Cr(1) atom.
Sr2MgYCrO6 crystallizes in the triclinic P1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 3-coordinate geometry to one O(1), one O(2), one O(3), one O(5), and one O(6) atom. The Sr(1)-O(1) bond length is 2.29 Å. The Sr(1)-O(2) bond length is 2.43 Å. The Sr(1)-O(3) bond length is 2.43 Å. The Sr(1)-O(5) bond length is 2.85 Å. The Sr(1)-O(6) bond length is 2.85 Å. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), and two equivalent O(1) atoms. The Sr(2)-O(2) bond length is 2.59 Å. The Sr(2)-O(3) bond length is 2.59 Å. The Sr(2)-O(4) bond length is 2.51 Å. The Sr(2)-O(5) bond length is 2.63 Å. The Sr(2)-O(6) bond length is 2.63 Å. Both Sr(2)-O(1) bond lengths are 2.97 Å. Mg(1) is bonded to one O(1), one O(2), one O(3), one O(5), and one O(6) atom to form distorted MgO5 square pyramids that share corners with two equivalent Cr(1)O6 octahedra and  a faceface with one Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles are 50°. The Mg(1)-O(1) bond length is 1.94 Å. The Mg(1)-O(2) bond length is 2.03 Å. The Mg(1)-O(3) bond length is 2.03 Å. The Mg(1)-O(5) bond length is 2.15 Å. The Mg(1)-O(6) bond length is 2.15 Å. Y(1) is bonded in a 4-coordinate geometry to one O(1), one O(4), one O(5), and one O(6) atom. The Y(1)-O(1) bond length is 2.26 Å. The Y(1)-O(4) bond length is 2.17 Å. The Y(1)-O(5) bond length is 2.13 Å. The Y(1)-O(6) bond length is 2.13 Å. Cr(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form distorted CrO6 octahedra that share corners with two equivalent Mg(1)O5 square pyramids and  a faceface with one Mg(1)O5 square pyramid. The Cr(1)-O(1) bond length is 2.34 Å. The Cr(1)-O(2) bond length is 2.10 Å. The Cr(1)-O(3) bond length is 2.11 Å. The Cr(1)-O(4) bond length is 1.98 Å. The Cr(1)-O(5) bond length is 2.07 Å. The Cr(1)-O(6) bond length is 2.07 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Sr(1), two equivalent Sr(2), one Mg(1), one Y(1), and one Cr(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Mg(1), and one Cr(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Mg(1), and one Cr(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(2), one Y(1), and one Cr(1) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Mg(1), one Y(1), and one Cr(1) atom. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Mg(1), one Y(1), and one Cr(1) atom.