BaLa2Mn3O9 crystallizes in the trigonal P-3c1 space group. Ba(1) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form BaO12 cuboctahedra that share corners with six equivalent Ba(1)O12 cuboctahedra, faces with two equivalent Mn(2)O6 octahedra, and faces with six equivalent Mn(1)O6 octahedra. La(1) is bonded in a 9-coordinate geometry to three equivalent O(2) and six equivalent O(1) atoms. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form MnO6 octahedra that share corners with three equivalent Mn(1)O6 octahedra, corners with three equivalent Mn(2)O6 octahedra, and faces with three equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 7-20°. In the second Mn site, Mn(2) is bonded to six equivalent O(1) atoms to form MnO6 octahedra that share corners with six equivalent Mn(1)O6 octahedra and faces with two equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 20°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Ba(1), two equivalent La(1), one Mn(1), and one Mn(2) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Ba(1), two equivalent La(1), and two equivalent Mn(1) atoms.
BaLa2Mn3O9 crystallizes in the trigonal P-3c1 space group. Ba(1) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form BaO12 cuboctahedra that share corners with six equivalent Ba(1)O12 cuboctahedra, faces with two equivalent Mn(2)O6 octahedra, and faces with six equivalent Mn(1)O6 octahedra. All Ba(1)-O(1) bond lengths are 2.91 Å. There are three shorter (2.70 Å) and three longer (2.93 Å) Ba(1)-O(2) bond lengths. La(1) is bonded in a 9-coordinate geometry to three equivalent O(2) and six equivalent O(1) atoms. All La(1)-O(2) bond lengths are 2.82 Å. There are three shorter (2.49 Å) and three longer (2.71 Å) La(1)-O(1) bond lengths. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form MnO6 octahedra that share corners with three equivalent Mn(1)O6 octahedra, corners with three equivalent Mn(2)O6 octahedra, and faces with three equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 7-20°. All Mn(1)-O(1) bond lengths are 2.04 Å. All Mn(1)-O(2) bond lengths are 1.99 Å. In the second Mn site, Mn(2) is bonded to six equivalent O(1) atoms to form MnO6 octahedra that share corners with six equivalent Mn(1)O6 octahedra and faces with two equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 20°. All Mn(2)-O(1) bond lengths are 1.99 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Ba(1), two equivalent La(1), one Mn(1), and one Mn(2) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Ba(1), two equivalent La(1), and two equivalent Mn(1) atoms.