Materials Data on NdFe3(BO3)4 by Materials Project

Abstract

NdFe3(BO3)4 is Calcite-derived structured and crystallizes in the trigonal R32 space group. The structure is three-dimensional. Nd3+ is bonded to six equivalent O2- atoms to form distorted NdO6 pentagonal pyramids that share corners with six equivalent FeO6 octahedra. The corner-sharing octahedral tilt angles are 60°. All Nd–O bond lengths are 2.43 Å. Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with two equivalent NdO6 pentagonal pyramids and edges with two equivalent FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 1.99–2.07 Å. There are two inequivalent B3+ sites. In the first B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There is two shorter (1.38 Å) and one longer (1.39 Å) B–O bond length. In the second B3+ site, B3+ is bonded in a trigonal planar geometry to three equivalent O2- atoms. All B–O bond lengths are 1.39 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to one Nd3+, one Fe3+, and one B3+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Fe3+ and one B3+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Fe3+ and one B3+ atom.