Materials Data on Ca3Mg2Fe(CO3)6 by Materials Project

Abstract

Ca3Mg2Fe(CO3)6 is Calcite-derived structured and crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are two inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded to six O2- atoms to form CaO6 octahedra that share corners with three equivalent MgO6 octahedra and corners with three equivalent FeO6 octahedra. The corner-sharing octahedral tilt angles are 61°. There are a spread of Ca–O bond distances ranging from 2.38–2.42 Å. In the second Ca2+ site, Ca2+ is bonded to six O2- atoms to form CaO6 octahedra that share corners with six equivalent MgO6 octahedra. The corner-sharing octahedral tilt angles are 61°. All Ca–O bond lengths are 2.41 Å. Mg2+ is bonded to six O2- atoms to form MgO6 octahedra that share corners with six CaO6 octahedra. The corner-sharing octahedral tilt angles are 61°. There are four shorter (2.12 Å) and two longer (2.13 Å) Mg–O bond lengths. Fe2+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with six equivalent CaO6 octahedra. The corner-sharing octahedral tilt angles are 61°. There are two shorter (2.14 Å) and four longer (2.16 Å) Fe–O bond lengths. There are three inequivalent C4+ sites. In the first C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.29 Å) and two longer (1.30 Å) C–O bond length. In the second C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. All C–O bond lengths are 1.30 Å. In the third C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. All C–O bond lengths are 1.30 Å. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+, one Mg2+, and one C4+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+, one Mg2+, and one C4+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+, one Fe2+, and one C4+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+, one Mg2+, and one C4+ atom. In the fifth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+, one Mg2+, and one C4+ atom. In the sixth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+, one Fe2+, and one C4+ atom. In the seventh O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+, one Mg2+, and one C4+ atom. In the eighth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+, one Mg2+, and one C4+ atom. In the ninth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+, one Fe2+, and one C4+ atom.