Er4LaGe3 crystallizes in the trigonal P-31m space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 6-coordinate geometry to six equivalent Ge(1) atoms. In the second Er site, Er(2) is bonded in a 5-coordinate geometry to five equivalent Ge(1) atoms. La(1) is bonded in a 6-coordinate geometry to six equivalent Ge(1) atoms. Ge(1) is bonded in a 9-coordinate geometry to two equivalent Er(1), five equivalent Er(2), and two equivalent La(1) atoms.
Er4LaGe3 crystallizes in the trigonal P-31m space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 6-coordinate geometry to six equivalent Ge(1) atoms. All Er(1)-Ge(1) bond lengths are 3.04 Å. In the second Er site, Er(2) is bonded in a 5-coordinate geometry to five equivalent Ge(1) atoms. There are a spread of Er(2)-Ge(1) bond distances ranging from 2.90-3.63 Å. La(1) is bonded in a 6-coordinate geometry to six equivalent Ge(1) atoms. All La(1)-Ge(1) bond lengths are 3.16 Å. Ge(1) is bonded in a 9-coordinate geometry to two equivalent Er(1), five equivalent Er(2), and two equivalent La(1) atoms.