Materials Data on LaFe5H12 by Materials Project
LaFe5H12 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. La2+ is bonded to twelve equivalent H1- atoms to form LaH12 cuboctahedra that share edges with six equivalent FeH6 pentagonal pyramids. All La–H bond lengths are 2.40 Å. There are two inequivalent Fe2+ sites. In the first Fe2+ site, Fe2+ is bonded in a body-centered cubic geometry to eight equivalent H1- atoms. All Fe–H bond lengths are 1.80 Å. In the second Fe2+ site, Fe2+ is bonded to six equivalent H1- atoms to form distorted FeH6 pentagonal pyramids that share edges with three equivalent LaH12 cuboctahedra. All Fe–H bond lengths are 1.64 Å. H1- is bonded to one La2+ and three Fe2+ atoms to form a mixture of distorted edge and corner-sharing HLaFe3 tetrahedra.