BaMgLa(CoO3)2 crystallizes in the orthorhombic Pmmm space group. Ba(1) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms to form a mixture of distorted face and corner-sharing BaO12 cuboctahedra. Mg(1) is bonded in a square co-planar geometry to two equivalent O(3) and two equivalent O(4) atoms. La(1) is bonded in a distorted square co-planar geometry to four equivalent O(2) atoms. Co(1) is bonded in a square co-planar geometry to one O(1), one O(4), and two equivalent O(3) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to four equivalent Ba(1) and two equivalent Co(1) atoms. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Ba(1) and two equivalent La(1) atoms. In the third O site, O(3) is bonded in a T-shaped geometry to two equivalent Ba(1), one Mg(1), and two equivalent Co(1) atoms. In the fourth O site, O(4) is bonded in a square co-planar geometry to two equivalent Mg(1) and two equivalent Co(1) atoms.
BaMgLa(CoO3)2 crystallizes in the orthorhombic Pmmm space group. Ba(1) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms to form a mixture of distorted face and corner-sharing BaO12 cuboctahedra. All Ba(1)-O(1) bond lengths are 3.37 Å. All Ba(1)-O(2) bond lengths are 3.01 Å. All Ba(1)-O(3) bond lengths are 3.43 Å. Mg(1) is bonded in a square co-planar geometry to two equivalent O(3) and two equivalent O(4) atoms. Both Mg(1)-O(3) bond lengths are 1.89 Å. Both Mg(1)-O(4) bond lengths are 1.90 Å. La(1) is bonded in a distorted square co-planar geometry to four equivalent O(2) atoms. All La(1)-O(2) bond lengths are 2.45 Å. Co(1) is bonded in a square co-planar geometry to one O(1), one O(4), and two equivalent O(3) atoms. The Co(1)-O(1) bond length is 1.82 Å. The Co(1)-O(4) bond length is 2.06 Å. Both Co(1)-O(3) bond lengths are 1.91 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to four equivalent Ba(1) and two equivalent Co(1) atoms. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Ba(1) and two equivalent La(1) atoms. In the third O site, O(3) is bonded in a T-shaped geometry to two equivalent Ba(1), one Mg(1), and two equivalent Co(1) atoms. In the fourth O site, O(4) is bonded in a square co-planar geometry to two equivalent Mg(1) and two equivalent Co(1) atoms.