Materials Data on Sr5Si3 by Materials Project

Sr5Si3 crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. there are two inequivalent Sr sites. In the first Sr site, Sr is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Sr–Si bond distances ranging from 3.24–3.47 Å. In the second Sr site, Sr is bonded to four equivalent Si atoms to form distorted edge-sharing SrSi4 tetrahedra. All Sr–Si bond lengths are 3.19 Å. There are two inequivalent Si sites. In the first Si site, Si is bonded in a 6-coordinate geometry to six Sr atoms. In the second Si site, Si is bonded in a 8-coordinate geometry to eight equivalent Sr atoms.