BaMgLa(CoO3)2 crystallizes in the orthorhombic Pmmm space group. Ba(1) is bonded in a 6-coordinate geometry to two equivalent Mg(1) and four equivalent O(2) atoms. Mg(1) is bonded in a square co-planar geometry to two equivalent Ba(1), two equivalent O(1), and two equivalent O(3) atoms. La(1) is bonded in a distorted square co-planar geometry to four equivalent O(2) atoms. Co(1) is bonded in a distorted square co-planar geometry to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a square co-planar geometry to two equivalent Mg(1) and two equivalent Co(1) atoms. In the second O site, O(2) is bonded to two equivalent Ba(1), two equivalent La(1), and two equivalent Co(1) atoms to form a mixture of distorted edge and corner-sharing OBa2La2Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the third O site, O(3) is bonded in a T-shaped geometry to one Mg(1) and two equivalent Co(1) atoms. In the fourth O site, O(4) is bonded in a linear geometry to two equivalent Co(1) atoms.
BaMgLa(CoO3)2 crystallizes in the orthorhombic Pmmm space group. Ba(1) is bonded in a 6-coordinate geometry to two equivalent Mg(1) and four equivalent O(2) atoms. Both Ba(1)-Mg(1) bond lengths are 2.73 Å. All Ba(1)-O(2) bond lengths are 2.92 Å. Mg(1) is bonded in a square co-planar geometry to two equivalent Ba(1), two equivalent O(1), and two equivalent O(3) atoms. Both Mg(1)-O(1) bond lengths are 1.91 Å. Both Mg(1)-O(3) bond lengths are 1.89 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 2.53 Å. Co(1) is bonded in a distorted square co-planar geometry to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms. The Co(1)-O(1) bond length is 2.09 Å. The Co(1)-O(4) bond length is 1.79 Å. Both Co(1)-O(2) bond lengths are 2.74 Å. Both Co(1)-O(3) bond lengths are 1.92 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a square co-planar geometry to two equivalent Mg(1) and two equivalent Co(1) atoms. In the second O site, O(2) is bonded to two equivalent Ba(1), two equivalent La(1), and two equivalent Co(1) atoms to form a mixture of distorted edge and corner-sharing OBa2La2Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the third O site, O(3) is bonded in a T-shaped geometry to one Mg(1) and two equivalent Co(1) atoms. In the fourth O site, O(4) is bonded in a linear geometry to two equivalent Co(1) atoms.