Materials Data on Er2Co17 by Materials Project
Er2Co17 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Er sites. In the first Er site, Er is bonded in a 12-coordinate geometry to eighteen Co atoms. There are a spread of Er–Co bond distances ranging from 2.92–3.24 Å. In the second Er site, Er is bonded in a 2-coordinate geometry to twenty Co atoms. There are a spread of Er–Co bond distances ranging from 2.88–3.13 Å. There are four inequivalent Co sites. In the first Co site, Co is bonded in a 2-coordinate geometry to one Er and thirteen Co atoms. There are a spread of Co–Co bond distances ranging from 2.32–2.67 Å. In the second Co site, Co is bonded to two equivalent Er and ten Co atoms to form CoEr2Co10 cuboctahedra that share corners with fourteen CoEr2Co10 cuboctahedra, edges with six equivalent CoEr3Co9 cuboctahedra, and faces with ten CoEr2Co10 cuboctahedra. There are four shorter (2.39 Å) and four longer (2.40 Å) Co–Co bond lengths. In the third Co site, Co is bonded in a 12-coordinate geometry to two Er and ten Co atoms. There are a spread of Co–Co bond distances ranging from 2.34–2.53 Å. In the fourth Co site, Co is bonded to three Er and nine Co atoms to form a mixture of distorted edge, face, and corner-sharing CoEr3Co9 cuboctahedra. Both Co–Co bond lengths are 2.41 Å.