Sr2MgYCrO6 crystallizes in the orthorhombic Immm space group. Sr(1) is bonded in a 9-coordinate geometry to one Mg(1), four equivalent O(1), and four equivalent O(2) atoms. Mg(1) is bonded in a square co-planar geometry to two equivalent Sr(1) and four equivalent O(1) atoms. Y(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form YO6 octahedra that share corners with six equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. Cr(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form CrO6 octahedra that share corners with six equivalent Y(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), one Mg(1), one Y(1), and one Cr(1) atom to form a mixture of distorted corner, edge, and face-sharing OSr2YMgCr trigonal bipyramids. In the second O site, O(2) is bonded in a 6-coordinate geometry to four equivalent Sr(1), one Y(1), and one Cr(1) atom.
Sr2MgYCrO6 crystallizes in the orthorhombic Immm space group. Sr(1) is bonded in a 9-coordinate geometry to one Mg(1), four equivalent O(1), and four equivalent O(2) atoms. The Sr(1)-Mg(1) bond length is 2.91 Å. All Sr(1)-O(1) bond lengths are 2.72 Å. There are two shorter (2.99 Å) and two longer (3.01 Å) Sr(1)-O(2) bond lengths. Mg(1) is bonded in a square co-planar geometry to two equivalent Sr(1) and four equivalent O(1) atoms. All Mg(1)-O(1) bond lengths are 2.03 Å. Y(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form YO6 octahedra that share corners with six equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. Both Y(1)-O(2) bond lengths are 2.40 Å. All Y(1)-O(1) bond lengths are 2.17 Å. Cr(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form CrO6 octahedra that share corners with six equivalent Y(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. Both Cr(1)-O(2) bond lengths are 2.21 Å. All Cr(1)-O(1) bond lengths are 1.98 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), one Mg(1), one Y(1), and one Cr(1) atom to form a mixture of distorted corner, edge, and face-sharing OSr2YMgCr trigonal bipyramids. In the second O site, O(2) is bonded in a 6-coordinate geometry to four equivalent Sr(1), one Y(1), and one Cr(1) atom.