Materials Data on Ca2B5Os3 by Materials Project

Abstract

Ca2Os3B5 crystallizes in the monoclinic C2 space group. The structure is three-dimensional. Ca2+ is bonded in a 2-coordinate geometry to two equivalent Os+0.33- and seven B+0.60- atoms. There are one shorter (3.23 Å) and one longer (3.26 Å) Ca–Os bond lengths. There are a spread of Ca–B bond distances ranging from 2.70–3.20 Å. There are two inequivalent Os+0.33- sites. In the first Os+0.33- site, Os+0.33- is bonded in a 6-coordinate geometry to four equivalent Ca2+ and six B+0.60- atoms. There are a spread of Os–B bond distances ranging from 2.18–2.25 Å. In the second Os+0.33- site, Os+0.33- is bonded in a 5-coordinate geometry to five B+0.60- atoms. There are a spread of Os–B bond distances ranging from 1.96–2.27 Å. There are three inequivalent B+0.60- sites. In the first B+0.60- site, B+0.60- is bonded to four equivalent Ca2+ and two equivalent Os+0.33- atoms to form edge-sharing BCa4Os2 octahedra. In the second B+0.60- site, B+0.60- is bonded in a 7-coordinate geometry to two equivalent Ca2+, three Os+0.33-, and two B+0.60- atoms. There is one shorter (1.66 Å) and one longer (1.72 Å) B–B bond length. In the third B+0.60- site, B+0.60- is bonded in a 5-coordinate geometry to three equivalent Ca2+, four Os+0.33-, and one B+0.60- atom.