Materials Data on Sr3(FeO3)2 by Materials Project
Sr3Fe2O6 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent Sr2+ sites. In the first Sr2+ site, Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.48–2.82 Å. In the second Sr2+ site, Sr2+ is bonded in a body-centered cubic geometry to eight equivalent O2- atoms. All Sr–O bond lengths are 2.61 Å. Fe3+ is bonded to five O2- atoms to form corner-sharing FeO5 square pyramids. There is one shorter (1.91 Å) and four longer (2.01 Å) Fe–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to five equivalent Sr2+ and one Fe3+ atom to form distorted OSr5Fe octahedra that share corners with sixteen OSr5Fe octahedra, edges with eight equivalent OSr5Fe octahedra, and faces with four equivalent OSr4Fe2 octahedra. The corner-sharing octahedra tilt angles range from 14–54°. In the second O2- site, O2- is bonded to four Sr2+ and two equivalent Fe3+ atoms to form distorted OSr4Fe2 octahedra that share corners with fourteen OSr5Fe octahedra, edges with three equivalent OSr4Fe2 octahedra, and faces with six OSr5Fe octahedra. The corner-sharing octahedra tilt angles range from 0–65°.