Sr2MgCoO4 crystallizes in the monoclinic C2 space group. Sr(1) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. Mg(1) is bonded in a rectangular see-saw-like geometry to four equivalent O(1) atoms. Co(1) is bonded in a rectangular see-saw-like geometry to four equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Sr(1) and two equivalent Mg(1) atoms to form distorted OSr4Mg2 octahedra that share corners with two equivalent O(1)Sr4Mg2 octahedra, corners with twelve equivalent O(2)Sr4Co2 octahedra, edges with two equivalent O(2)Sr4Co2 octahedra, edges with two equivalent O(1)Sr4Mg2 octahedra, and faces with four equivalent O(1)Sr4Mg2 octahedra. The corner-sharing octahedral tilt angles range from 1-66°. In the second O site, O(2) is bonded to four equivalent Sr(1) and two equivalent Co(1) atoms to form OSr4Co2 octahedra that share corners with two equivalent O(2)Sr4Co2 octahedra, corners with twelve equivalent O(1)Sr4Mg2 octahedra, edges with two equivalent O(2)Sr4Co2 octahedra, edges with two equivalent O(1)Sr4Mg2 octahedra, and faces with four equivalent O(2)Sr4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-66°.
Sr2MgCoO4 crystallizes in the monoclinic C2 space group. Sr(1) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. There are a spread of Sr(1)-O(1) bond distances ranging from 2.59-2.65 Å. There are a spread of Sr(1)-O(2) bond distances ranging from 2.67-2.70 Å. Mg(1) is bonded in a rectangular see-saw-like geometry to four equivalent O(1) atoms. All Mg(1)-O(1) bond lengths are 2.01 Å. Co(1) is bonded in a rectangular see-saw-like geometry to four equivalent O(2) atoms. All Co(1)-O(2) bond lengths are 2.01 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Sr(1) and two equivalent Mg(1) atoms to form distorted OSr4Mg2 octahedra that share corners with two equivalent O(1)Sr4Mg2 octahedra, corners with twelve equivalent O(2)Sr4Co2 octahedra, edges with two equivalent O(2)Sr4Co2 octahedra, edges with two equivalent O(1)Sr4Mg2 octahedra, and faces with four equivalent O(1)Sr4Mg2 octahedra. The corner-sharing octahedral tilt angles range from 1-66°. In the second O site, O(2) is bonded to four equivalent Sr(1) and two equivalent Co(1) atoms to form OSr4Co2 octahedra that share corners with two equivalent O(2)Sr4Co2 octahedra, corners with twelve equivalent O(1)Sr4Mg2 octahedra, edges with two equivalent O(2)Sr4Co2 octahedra, edges with two equivalent O(1)Sr4Mg2 octahedra, and faces with four equivalent O(2)Sr4Co2 octahedra. The corner-sharing octahedral tilt angles range from 1-66°.