Materials Data on FeNiSb6 by Materials Project
FeNiSb6 is Skutterudite-derived structured and crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Fe3+ is bonded to six Sb+0.83- atoms to form FeSb6 octahedra that share corners with two equivalent FeSb6 octahedra and corners with four equivalent NiSb6 octahedra. The corner-sharing octahedra tilt angles range from 51–53°. There are a spread of Fe–Sb bond distances ranging from 2.51–2.53 Å. Ni2+ is bonded to six Sb+0.83- atoms to form NiSb6 octahedra that share corners with two equivalent NiSb6 octahedra and corners with four equivalent FeSb6 octahedra. The corner-sharing octahedra tilt angles range from 53–54°. There are two shorter (2.56 Å) and four longer (2.58 Å) Ni–Sb bond lengths. There are four inequivalent Sb+0.83- sites. In the first Sb+0.83- site, Sb+0.83- is bonded in a 2-coordinate geometry to two equivalent Fe3+ atoms. In the second Sb+0.83- site, Sb+0.83- is bonded in a 2-coordinate geometry to two equivalent Ni2+ atoms. In the third Sb+0.83- site, Sb+0.83- is bonded in a 2-coordinate geometry to one Fe3+ and one Ni2+ atom. In the fourth Sb+0.83- site, Sb+0.83- is bonded in a 2-coordinate geometry to one Fe3+ and one Ni2+ atom.