Materials Data on BaCoO2 by Materials Project
BaCoO2 crystallizes in the trigonal P3_121 space group. The structure is three-dimensional. Ba2+ is bonded in a 8-coordinate geometry to eight equivalent O2- atoms. There are a spread of Ba–O bond distances ranging from 2.70–3.31 Å. Co2+ is bonded to four equivalent O2- atoms to form corner-sharing CoO4 tetrahedra. There is two shorter (1.95 Å) and two longer (2.04 Å) Co–O bond length. O2- is bonded in a 2-coordinate geometry to four equivalent Ba2+ and two equivalent Co2+ atoms.