Materials Data on Al6Ge5 by Materials Project

Abstract

Al6Ge5 crystallizes in the trigonal R-3c space group. The structure is three-dimensional. Al is bonded in a 4-coordinate geometry to four Ge atoms. There are a spread of Al–Ge bond distances ranging from 2.51–2.65 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded to three equivalent Al and one Ge atom to form distorted corner-sharing GeAl3Ge tetrahedra. The Ge–Ge bond length is 2.51 Å. In the second Ge site, Ge is bonded to six equivalent Al atoms to form distorted GeAl6 pentagonal pyramids that share corners with four equivalent GeAl6 pentagonal pyramids, corners with six equivalent GeAl3Ge tetrahedra, and edges with four equivalent GeAl6 pentagonal pyramids.