Materials Data on Sr3GaO4F by Materials Project
Sr3GaO4F crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. there are two inequivalent Sr2+ sites. In the first Sr2+ site, Sr2+ is bonded in a 8-coordinate geometry to six equivalent O2- and two equivalent F1- atoms. There are two shorter (2.44 Å) and four longer (2.72 Å) Sr–O bond lengths. Both Sr–F bond lengths are 2.55 Å. In the second Sr2+ site, Sr2+ is bonded in a distorted q6 geometry to eight equivalent O2- and two equivalent F1- atoms. All Sr–O bond lengths are 2.89 Å. Both Sr–F bond lengths are 2.87 Å. Ga3+ is bonded in a tetrahedral geometry to four equivalent O2- atoms. All Ga–O bond lengths are 1.88 Å. O2- is bonded in a 6-coordinate geometry to five Sr2+ and one Ga3+ atom. F1- is bonded to six Sr2+ atoms to form corner-sharing FSr6 octahedra. The corner-sharing octahedra tilt angles range from 0–37°.