ErRu2 is Hexagonal Laves structured and crystallizes in the hexagonal P6_3/mmc space group. Er(1) is bonded in a 12-coordinate geometry to three equivalent Ru(2) and nine equivalent Ru(1) atoms. There are two inequivalent Ru sites. In the first Ru site, Ru(2) is bonded to six equivalent Er(1) and six equivalent Ru(1) atoms to form a mixture of face, corner, and edge-sharing RuEr6Ru6 cuboctahedra. In the second Ru site, Ru(1) is bonded to six equivalent Er(1), two equivalent Ru(2), and four equivalent Ru(1) atoms to form a mixture of face, corner, and edge-sharing RuEr6Ru6 cuboctahedra.
ErRu2 is Hexagonal Laves structured and crystallizes in the hexagonal P6_3/mmc space group. Er(1) is bonded in a 12-coordinate geometry to three equivalent Ru(2) and nine equivalent Ru(1) atoms. All Er(1)-Ru(2) bond lengths are 3.06 Å. There are six shorter (3.06 Å) and three longer (3.17 Å) Er(1)-Ru(1) bond lengths. There are two inequivalent Ru sites. In the first Ru site, Ru(2) is bonded to six equivalent Er(1) and six equivalent Ru(1) atoms to form a mixture of face, corner, and edge-sharing RuEr6Ru6 cuboctahedra. All Ru(2)-Ru(1) bond lengths are 2.70 Å. In the second Ru site, Ru(1) is bonded to six equivalent Er(1), two equivalent Ru(2), and four equivalent Ru(1) atoms to form a mixture of face, corner, and edge-sharing RuEr6Ru6 cuboctahedra. There are two shorter (2.53 Å) and two longer (2.67 Å) Ru(1)-Ru(1) bond lengths.