Materials Data on Li3Fe2(CO4)2 by Materials Project
Li3Fe2(CO4)2 crystallizes in the monoclinic Pc space group. The structure is three-dimensional. there are three inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded to four O2- atoms to form LiO4 tetrahedra that share a cornercorner with one LiO4 tetrahedra, a cornercorner with one FeO4 tetrahedra, corners with two equivalent LiO4 trigonal pyramids, and an edgeedge with one FeO4 tetrahedra. There are a spread of Li–O bond distances ranging from 1.91–2.09 Å. In the second Li1+ site, Li1+ is bonded to four O2- atoms to form LiO4 tetrahedra that share a cornercorner with one LiO4 tetrahedra, corners with four FeO4 tetrahedra, a cornercorner with one LiO4 trigonal pyramid, and an edgeedge with one LiO4 trigonal pyramid. There are a spread of Li–O bond distances ranging from 1.94–2.11 Å. In the third Li1+ site, Li1+ is bonded to four O2- atoms to form LiO4 trigonal pyramids that share a cornercorner with one FeO4 tetrahedra, corners with three LiO4 tetrahedra, an edgeedge with one LiO4 tetrahedra, and an edgeedge with one FeO4 tetrahedra. There are a spread of Li–O bond distances ranging from 1.93–2.18 Å. There are two inequivalent Fe+2.50+ sites. In the first Fe+2.50+ site, Fe+2.50+ is bonded to four O2- atoms to form FeO4 tetrahedra that share corners with two equivalent LiO4 tetrahedra, corners with two equivalent FeO4 tetrahedra, a cornercorner with one LiO4 trigonal pyramid, and an edgeedge with one LiO4 tetrahedra. There are a spread of Fe–O bond distances ranging from 1.82–2.02 Å. In the second Fe+2.50+ site, Fe+2.50+ is bonded to four O2- atoms to form distorted FeO4 tetrahedra that share corners with two equivalent FeO4 tetrahedra, corners with three LiO4 tetrahedra, and an edgeedge with one LiO4 trigonal pyramid. There are a spread of Fe–O bond distances ranging from 1.92–2.26 Å. There are two inequivalent C4+ sites. In the first C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of C–O bond distances ranging from 1.28–1.32 Å. In the second C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.26 Å) and two longer (1.32 Å) C–O bond length. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded to three Li1+ and one C4+ atom to form edge-sharing OLi3C tetrahedra. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Li1+, one Fe+2.50+, and one C4+ atom. In the third O2- site, O2- is bonded in a bent 120 degrees geometry to one Fe+2.50+ and one C4+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Li1+ and two Fe+2.50+ atoms. In the fifth O2- site, O2- is bonded to two Li1+ and two Fe+2.50+ atoms to form distorted edge-sharing OLi2Fe2 trigonal pyramids. In the sixth O2- site, O2- is bonded in a trigonal planar geometry to one Li1+, one Fe+2.50+, and one C4+ atom. In the seventh O2- site, O2- is bonded in a 4-coordinate geometry to two Li1+, one Fe+2.50+, and one C4+ atom. In the eighth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Li1+ and one C4+ atom.