Materials Data on Ca(FeS2)2 by Materials Project

Abstract

Ca(FeS2)2 is Spinel structured and crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional. Ca2+ is bonded to four equivalent S2- atoms to form CaS4 tetrahedra that share corners with twelve equivalent FeS6 octahedra. The corner-sharing octahedra tilt angles range from 59–65°. All Ca–S bond lengths are 2.61 Å. Fe3+ is bonded to six equivalent S2- atoms to form distorted FeS6 octahedra that share corners with six equivalent CaS4 tetrahedra and edges with six equivalent FeS6 octahedra. There are two shorter (2.33 Å) and four longer (2.34 Å) Fe–S bond lengths. S2- is bonded to one Ca2+ and three equivalent Fe3+ atoms to form a mixture of edge and corner-sharing SCaFe3 tetrahedra.