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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Co4B6O13 by Materials Project

Co4(BO2)6O crystallizes in the cubic I-43m space group. The structure is three-dimensional. Co2+ is bonded to four O2- atoms to form distorted CoO4 trigonal pyramids that share corners with six equivalent BO4 tetrahedra and corners with three equivalent CoO4 trigonal pyramids. There are three shorter (1.99 Å) and one longer (2.01 Å) Co–O bond lengths. B3+ is bonded to four equivalent O2- atoms to form BO4 tetrahedra that share corners with four equivalent BO4 tetrahedra and corners with four equivalent CoO4 trigonal pyramids. All B–O bond lengths are 1.48 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a tetrahedral geometry to four equivalent Co2+ atoms. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to one Co2+ and two equivalent B3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Co2B2O5 by Materials Project

Co2B2O5 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are two inequivalent Co2+ sites. In the first Co2+ site, Co2+ is bonded to six O2- atoms to form edge-sharing CoO6 octahedra. There are a spread of Co–O bond distances ranging from 2.05–2.18 Å. In the second Co2+ site, Co2+ is bonded to six O2- atoms to form distorted edge-sharing CoO6 octahedra. There are a spread of Co–O bond distances ranging from 2.00–2.32 Å. There are two inequivalent B3+ sites. In the first B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of B–O bond distances ranging from 1.36–1.43 Å. In the second B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of B–O bond distances ranging from 1.35–1.42 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to three Co2+ and one B3+ atom. In the second O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to three equivalent Co2+ and one B3+ atom. In the third O2- site, O2- is bonded in a 4-coordinate geometry to three Co2+ and one B3+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Co2+ and one B3+ atom. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to one Co2+ and two B3+ atoms.

36 MATERIALS SCIENCE↗