Materials Data on Sr8Al7 by Materials Project
Sr8Al7 crystallizes in the cubic P2_13 space group. The structure is three-dimensional. there are four inequivalent Sr sites. In the first Sr site, Sr is bonded in a 6-coordinate geometry to six Al atoms. There are three shorter (3.47 Å) and three longer (3.48 Å) Sr–Al bond lengths. In the second Sr site, Sr is bonded in a 6-coordinate geometry to six Al atoms. There are three shorter (3.48 Å) and three longer (3.55 Å) Sr–Al bond lengths. In the third Sr site, Sr is bonded in a 5-coordinate geometry to five Al atoms. There are a spread of Sr–Al bond distances ranging from 3.34–3.62 Å. In the fourth Sr site, Sr is bonded in a 6-coordinate geometry to six Al atoms. There are a spread of Sr–Al bond distances ranging from 3.34–3.63 Å. There are three inequivalent Al sites. In the first Al site, Al is bonded in a 9-coordinate geometry to six Sr and three equivalent Al atoms. All Al–Al bond lengths are 2.75 Å. In the second Al site, Al is bonded in a 9-coordinate geometry to six Sr and three Al atoms. Both Al–Al bond lengths are 2.71 Å. In the third Al site, Al is bonded in a 9-coordinate geometry to seven Sr and two equivalent Al atoms. Both Al–Al bond lengths are 2.70 Å.