Rh3La crystallizes in the trigonal R-3m space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 12-coordinate geometry to three equivalent Rh(3) and nine equivalent Rh(1) atoms. In the second La site, La(2) is bonded in a distorted hexagonal planar geometry to six equivalent Rh(2) and twelve equivalent Rh(1) atoms. There are three inequivalent Rh sites. In the first Rh site, Rh(1) is bonded to two equivalent La(2), three equivalent La(1), one Rh(3), two equivalent Rh(2), and four equivalent Rh(1) atoms to form distorted RhLa5Rh7 cuboctahedra that share corners with two equivalent Rh(3)La6Rh6 cuboctahedra, corners with fifteen equivalent Rh(1)La5Rh7 cuboctahedra, edges with eight equivalent Rh(1)La5Rh7 cuboctahedra, faces with three equivalent Rh(3)La6Rh6 cuboctahedra, and faces with eleven equivalent Rh(1)La5Rh7 cuboctahedra. In the second Rh site, Rh(2) is bonded in a 9-coordinate geometry to three equivalent La(2) and six equivalent Rh(1) atoms. In the third Rh site, Rh(3) is bonded to six equivalent La(1) and six equivalent Rh(1) atoms to form RhLa6Rh6 cuboctahedra that share corners with twelve equivalent Rh(1)La5Rh7 cuboctahedra, edges with six equivalent Rh(3)La6Rh6 cuboctahedra, and faces with eighteen equivalent Rh(1)La5Rh7 cuboctahedra.
Rh3La crystallizes in the trigonal R-3m space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 12-coordinate geometry to three equivalent Rh(3) and nine equivalent Rh(1) atoms. All La(1)-Rh(3) bond lengths are 3.16 Å. There are six shorter (3.07 Å) and three longer (3.40 Å) La(1)-Rh(1) bond lengths. In the second La site, La(2) is bonded in a distorted hexagonal planar geometry to six equivalent Rh(2) and twelve equivalent Rh(1) atoms. All La(2)-Rh(2) bond lengths are 3.07 Å. All La(2)-Rh(1) bond lengths are 3.42 Å. There are three inequivalent Rh sites. In the first Rh site, Rh(1) is bonded to two equivalent La(2), three equivalent La(1), one Rh(3), two equivalent Rh(2), and four equivalent Rh(1) atoms to form distorted RhLa5Rh7 cuboctahedra that share corners with two equivalent Rh(3)La6Rh6 cuboctahedra, corners with fifteen equivalent Rh(1)La5Rh7 cuboctahedra, edges with eight equivalent Rh(1)La5Rh7 cuboctahedra, faces with three equivalent Rh(3)La6Rh6 cuboctahedra, and faces with eleven equivalent Rh(1)La5Rh7 cuboctahedra. The Rh(1)-Rh(3) bond length is 2.75 Å. There is one shorter (2.63 Å) and one longer (2.66 Å) Rh(1)-Rh(2) bond length. There are two shorter (2.65 Å) and two longer (2.67 Å) Rh(1)-Rh(1) bond lengths. In the second Rh site, Rh(2) is bonded in a 9-coordinate geometry to three equivalent La(2) and six equivalent Rh(1) atoms. In the third Rh site, Rh(3) is bonded to six equivalent La(1) and six equivalent Rh(1) atoms to form RhLa6Rh6 cuboctahedra that share corners with twelve equivalent Rh(1)La5Rh7 cuboctahedra, edges with six equivalent Rh(3)La6Rh6 cuboctahedra, and faces with eighteen equivalent Rh(1)La5Rh7 cuboctahedra.