Materials Data on SrSbSe2F by Materials Project
SrSbSe2F crystallizes in the tetragonal P4/nmm space group. The structure is two-dimensional and consists of one SrSbSe2F sheet oriented in the (0, 0, 1) direction. Sr2+ is bonded in a 4-coordinate geometry to four equivalent Se2- and four equivalent F1- atoms. All Sr–Se bond lengths are 3.21 Å. All Sr–F bond lengths are 2.52 Å. Sb3+ is bonded to five Se2- atoms to form a mixture of edge and corner-sharing SbSe5 square pyramids. There are one shorter (2.56 Å) and four longer (2.94 Å) Sb–Se bond lengths. There are two inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 1-coordinate geometry to four equivalent Sr2+ and one Sb3+ atom. In the second Se2- site, Se2- is bonded in a square co-planar geometry to four equivalent Sb3+ atoms. F1- is bonded to four equivalent Sr2+ atoms to form a mixture of edge and corner-sharing FSr4 tetrahedra.