Rh3La crystallizes in the hexagonal P6_3/mmc 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(4) and nine equivalent Rh(1) atoms. In the second La site, La(2) is bonded in a distorted hexagonal planar geometry to three equivalent Rh(2), three equivalent Rh(3), and twelve equivalent Rh(1) atoms. There are four inequivalent Rh sites. In the first Rh site, Rh(1) is bonded to two equivalent La(2), three equivalent La(1), one Rh(2), one Rh(3), one Rh(4), and four equivalent Rh(1) atoms to form distorted RhLa5Rh7 cuboctahedra that share corners with two equivalent Rh(4)La6Rh6 cuboctahedra, corners with fifteen equivalent Rh(1)La5Rh7 cuboctahedra, edges with eight equivalent Rh(1)La5Rh7 cuboctahedra, faces with three equivalent Rh(4)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 in a 9-coordinate geometry to three equivalent La(2) and six equivalent Rh(1) atoms. In the fourth Rh site, Rh(4) 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(4)La6Rh6 cuboctahedra, and faces with eighteen equivalent Rh(1)La5Rh7 cuboctahedra.
Rh3La crystallizes in the hexagonal P6_3/mmc 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(4) and nine equivalent Rh(1) atoms. All La(1)-Rh(4) bond lengths are 3.16 Å. There are six shorter (3.06 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 three equivalent Rh(2), three equivalent Rh(3), and twelve equivalent Rh(1) atoms. All La(2)-Rh(2) bond lengths are 3.07 Å. All La(2)-Rh(3) bond lengths are 3.07 Å. All La(2)-Rh(1) bond lengths are 3.42 Å. There are four inequivalent Rh sites. In the first Rh site, Rh(1) is bonded to two equivalent La(2), three equivalent La(1), one Rh(2), one Rh(3), one Rh(4), and four equivalent Rh(1) atoms to form distorted RhLa5Rh7 cuboctahedra that share corners with two equivalent Rh(4)La6Rh6 cuboctahedra, corners with fifteen equivalent Rh(1)La5Rh7 cuboctahedra, edges with eight equivalent Rh(1)La5Rh7 cuboctahedra, faces with three equivalent Rh(4)La6Rh6 cuboctahedra, and faces with eleven equivalent Rh(1)La5Rh7 cuboctahedra. The Rh(1)-Rh(2) bond length is 2.64 Å. The Rh(1)-Rh(3) bond length is 2.64 Å. The Rh(1)-Rh(4) bond length is 2.75 Å. All Rh(1)-Rh(1) bond lengths are 2.66 Å. 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 in a 9-coordinate geometry to three equivalent La(2) and six equivalent Rh(1) atoms. In the fourth Rh site, Rh(4) 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(4)La6Rh6 cuboctahedra, and faces with eighteen equivalent Rh(1)La5Rh7 cuboctahedra.