Materials Data on Nb9Co4Ge by Materials Project
Nb9Co4Ge is beta Uranium-derived structured and crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. there are three inequivalent Nb sites. In the first Nb site, Nb is bonded in a 7-coordinate geometry to nine Nb and five Co atoms. There are a spread of Nb–Nb bond distances ranging from 2.54–3.13 Å. There are a spread of Nb–Co bond distances ranging from 2.76–2.84 Å. In the second Nb site, Nb is bonded in a 6-coordinate geometry to four equivalent Nb, three Co, and two equivalent Ge atoms. All Nb–Co bond lengths are 2.73 Å. Both Nb–Ge bond lengths are 2.78 Å. In the third Nb site, Nb is bonded in a 6-coordinate geometry to ten Nb and four equivalent Co atoms. Both Nb–Nb bond lengths are 2.53 Å. All Nb–Co bond lengths are 2.78 Å. There are two inequivalent Co sites. In the first Co site, Co is bonded to ten Nb and two equivalent Co atoms to form a mixture of face, edge, and corner-sharing CoNb10Co2 cuboctahedra. Both Co–Co bond lengths are 2.53 Å. In the second Co site, Co is bonded to eight Nb and four Co atoms to form a mixture of face and corner-sharing CoNb8Co4 cuboctahedra. Both Co–Co bond lengths are 2.53 Å. Ge is bonded in a 10-coordinate geometry to eight equivalent Nb and two equivalent Ge atoms. Both Ge–Ge bond lengths are 2.53 Å.