Materials Data on La2(CuNi)5 by Materials Project

Abstract

La2(NiCu)5 crystallizes in the orthorhombic Pmmm space group. The structure is three-dimensional. there are two inequivalent La sites. In the first La site, La is bonded in a 6-coordinate geometry to twelve Ni and six Cu atoms. There are eight shorter (3.22 Å) and four longer (3.23 Å) La–Ni bond lengths. There are two shorter (2.92 Å) and four longer (2.95 Å) La–Cu bond lengths. In the second La site, La is bonded in a 6-coordinate geometry to eight equivalent Ni and ten Cu atoms. All La–Ni bond lengths are 3.23 Å. There are a spread of La–Cu bond distances ranging from 2.93–3.23 Å. There are two inequivalent Ni sites. In the first Ni site, Ni is bonded to four equivalent La, four equivalent Ni, and four equivalent Cu atoms to form NiLa4Cu4Ni4 cuboctahedra that share corners with four equivalent CuLa4Cu4Ni4 cuboctahedra, corners with twelve NiLa4Cu5Ni3 cuboctahedra, edges with ten NiLa4Cu5Ni3 cuboctahedra, and faces with ten NiLa4Cu4Ni4 cuboctahedra. All Ni–Ni bond lengths are 2.53 Å. All Ni–Cu bond lengths are 2.47 Å. In the second Ni site, Ni is bonded to four La, three Ni, and five Cu atoms to form NiLa4Cu5Ni3 cuboctahedra that share corners with two equivalent CuLa4Cu4Ni4 cuboctahedra, corners with fourteen NiLa4Cu4Ni4 cuboctahedra, edges with two equivalent CuLa4Cu4Ni4 cuboctahedra, edges with eight NiLa4Cu4Ni4 cuboctahedra, faces with two equivalent CuLa4Cu4Ni4 cuboctahedra, and faces with eight NiLa4Cu4Ni4 cuboctahedra. There are one shorter (2.54 Å) and one longer (2.57 Å) Ni–Ni bond lengths. There are a spread of Ni–Cu bond distances ranging from 2.46–2.56 Å. There are three inequivalent Cu sites. In the first Cu site, Cu is bonded in a 12-coordinate geometry to three La, four equivalent Ni, and two equivalent Cu atoms. Both Cu–Cu bond lengths are 2.48 Å. In the second Cu site, Cu is bonded in a 12-coordinate geometry to three La and six Ni atoms. In the third Cu site, Cu is bonded to four equivalent La, four equivalent Ni, and four equivalent Cu atoms to form CuLa4Cu4Ni4 cuboctahedra that share corners with four equivalent CuLa4Cu4Ni4 cuboctahedra, corners with twelve NiLa4Cu5Ni3 cuboctahedra, edges with two equivalent CuLa4Cu4Ni4 cuboctahedra, edges with eight equivalent NiLa4Cu5Ni3 cuboctahedra, faces with two equivalent CuLa4Cu4Ni4 cuboctahedra, and faces with eight equivalent NiLa4Cu5Ni3 cuboctahedra.