Materials Data on La(FeAs3)4 by Materials Project

Abstract

LaFe4As12 crystallizes in the cubic Im-3 space group. The structure is three-dimensional. La3+ is bonded to twelve equivalent As+1.25- atoms to form LaAs12 cuboctahedra that share faces with eight equivalent FeAs6 octahedra. All La–As bond lengths are 3.16 Å. Fe3+ is bonded to six equivalent As+1.25- atoms to form FeAs6 octahedra that share corners with six equivalent FeAs6 octahedra and faces with two equivalent LaAs12 cuboctahedra. The corner-sharing octahedral tilt angles are 56°. All Fe–As bond lengths are 2.37 Å. As+1.25- is bonded in a 2-coordinate geometry to one La3+, two equivalent Fe3+, and two equivalent As+1.25- atoms. There are one shorter (2.61 Å) and one longer (2.62 Å) As–As bond lengths.