BaLa2O4 crystallizes in the orthorhombic Cmcm space group. Ba(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), and four equivalent O(3) atoms. La(1) is bonded to one O(2), two equivalent O(1), and three equivalent O(3) atoms to form a mixture of corner and edge-sharing LaO6 octahedra. The corner-sharing octahedral tilt angles range from 0-53°. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1) and four equivalent La(1) atoms to form distorted OBa2La4 octahedra that share corners with two equivalent O(1)Ba2La4 octahedra, corners with eight equivalent O(3)Ba2La3 trigonal bipyramids, edges with two equivalent O(1)Ba2La4 octahedra, edges with four equivalent O(2)Ba2La2 tetrahedra, and edges with six equivalent O(3)Ba2La3 trigonal bipyramids. The corner-sharing octahedral tilt angles are 48°. In the second O site, O(2) is bonded to two equivalent Ba(1) and two equivalent La(1) atoms to form OBa2La2 tetrahedra that share corners with two equivalent O(2)Ba2La2 tetrahedra, corners with ten equivalent O(3)Ba2La3 trigonal bipyramids, edges with four equivalent O(1)Ba2La4 octahedra, and edges with two equivalent O(3)Ba2La3 trigonal bipyramids. In the third O site, O(3) is bonded to two equivalent Ba(1) and three equivalent La(1) atoms to form distorted OBa2La3 trigonal bipyramids that share corners with four equivalent O(1)Ba2La4 octahedra, corners with five equivalent O(2)Ba2La2 tetrahedra, corners with two equivalent O(3)Ba2La3 trigonal bipyramids, edges with three equivalent O(1)Ba2La4 octahedra,  an edgeedge with one O(2)Ba2La2 tetrahedra, and edges with five equivalent O(3)Ba2La3 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 11-41°.
BaLa2O4 crystallizes in the orthorhombic Cmcm space group. Ba(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), and four equivalent O(3) atoms. Both Ba(1)-O(1) bond lengths are 3.27 Å. Both Ba(1)-O(2) bond lengths are 2.63 Å. All Ba(1)-O(3) bond lengths are 2.96 Å. La(1) is bonded to one O(2), two equivalent O(1), and three equivalent O(3) atoms to form a mixture of corner and edge-sharing LaO6 octahedra. The corner-sharing octahedral tilt angles range from 0-53°. The La(1)-O(2) bond length is 2.37 Å. Both La(1)-O(1) bond lengths are 2.59 Å. There are two shorter (2.43 Å) and one longer (2.45 Å) La(1)-O(3) bond length. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1) and four equivalent La(1) atoms to form distorted OBa2La4 octahedra that share corners with two equivalent O(1)Ba2La4 octahedra, corners with eight equivalent O(3)Ba2La3 trigonal bipyramids, edges with two equivalent O(1)Ba2La4 octahedra, edges with four equivalent O(2)Ba2La2 tetrahedra, and edges with six equivalent O(3)Ba2La3 trigonal bipyramids. The corner-sharing octahedral tilt angles are 48°. In the second O site, O(2) is bonded to two equivalent Ba(1) and two equivalent La(1) atoms to form OBa2La2 tetrahedra that share corners with two equivalent O(2)Ba2La2 tetrahedra, corners with ten equivalent O(3)Ba2La3 trigonal bipyramids, edges with four equivalent O(1)Ba2La4 octahedra, and edges with two equivalent O(3)Ba2La3 trigonal bipyramids. In the third O site, O(3) is bonded to two equivalent Ba(1) and three equivalent La(1) atoms to form distorted OBa2La3 trigonal bipyramids that share corners with four equivalent O(1)Ba2La4 octahedra, corners with five equivalent O(2)Ba2La2 tetrahedra, corners with two equivalent O(3)Ba2La3 trigonal bipyramids, edges with three equivalent O(1)Ba2La4 octahedra,  an edgeedge with one O(2)Ba2La2 tetrahedra, and edges with five equivalent O(3)Ba2La3 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 11-41°.