Materials Data on Sr2Ge2Se5 by Materials Project
Sr2Ge2Se5 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Sr2+ sites. In the first Sr2+ site, Sr2+ is bonded in a 7-coordinate geometry to eight Se2- atoms. There are a spread of Sr–Se bond distances ranging from 3.10–3.75 Å. In the second Sr2+ site, Sr2+ is bonded in a 9-coordinate geometry to nine Se2- atoms. There are a spread of Sr–Se bond distances ranging from 3.17–3.67 Å. There are two inequivalent Ge3+ sites. In the first Ge3+ site, Ge3+ is bonded in a trigonal non-coplanar geometry to three Se2- atoms. There are a spread of Ge–Se bond distances ranging from 2.36–2.41 Å. In the second Ge3+ site, Ge3+ is bonded in a trigonal non-coplanar geometry to three Se2- atoms. There are a spread of Ge–Se bond distances ranging from 2.37–2.48 Å. There are five inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 5-coordinate geometry to four Sr2+ and one Ge3+ atom. In the second Se2- site, Se2- is bonded in a 3-coordinate geometry to two Sr2+ and two equivalent Ge3+ atoms. In the third Se2- site, Se2- is bonded in a 5-coordinate geometry to four Sr2+ and one Ge3+ atom. In the fourth Se2- site, Se2- is bonded in a 4-coordinate geometry to three Sr2+ and one Ge3+ atom. In the fifth Se2- site, Se2- is bonded in a 4-coordinate geometry to four Sr2+ and one Ge3+ atom.