Materials Data on BaLa2Mn3O9 by Materials Project
BaLa2Mn3O9 crystallizes in the trigonal P-3c1 space group. The structure is three-dimensional. Ba2+ is bonded to twelve O2- atoms to form BaO12 cuboctahedra that share corners with six equivalent BaO12 cuboctahedra and faces with eight MnO6 octahedra. There are a spread of Ba–O bond distances ranging from 2.70–2.93 Å. La3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.49–2.82 Å. There are two inequivalent Mn+3.33+ sites. In the first Mn+3.33+ site, Mn+3.33+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with six MnO6 octahedra and faces with three equivalent BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 7–20°. There are three shorter (1.99 Å) and three longer (2.04 Å) Mn–O bond lengths. In the second Mn+3.33+ site, Mn+3.33+ is bonded to six equivalent O2- atoms to form MnO6 octahedra that share corners with six equivalent MnO6 octahedra and faces with two equivalent BaO12 cuboctahedra. The corner-sharing octahedral tilt angles are 20°. All Mn–O bond lengths are 1.99 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 5-coordinate geometry to one Ba2+, two equivalent La3+, and two Mn+3.33+ atoms. In the second O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Ba2+, two equivalent La3+, and two equivalent Mn+3.33+ atoms.