EuNi5 crystallizes in the hexagonal P6/mmm space group. Eu(1) is bonded in a 18-coordinate geometry to six equivalent Ni(2) and twelve equivalent Ni(1) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to four equivalent Eu(1), four equivalent Ni(1), and four equivalent Ni(2) atoms to form a mixture of edge, face, and corner-sharing NiEu4Ni8 cuboctahedra. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to three equivalent Eu(1) and six equivalent Ni(1) atoms.
EuNi5 crystallizes in the hexagonal P6/mmm space group. Eu(1) is bonded in a 18-coordinate geometry to six equivalent Ni(2) and twelve equivalent Ni(1) atoms. All Eu(1)-Ni(2) bond lengths are 2.85 Å. All Eu(1)-Ni(1) bond lengths are 3.14 Å. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to four equivalent Eu(1), four equivalent Ni(1), and four equivalent Ni(2) atoms to form a mixture of edge, face, and corner-sharing NiEu4Ni8 cuboctahedra. All Ni(1)-Ni(1) bond lengths are 2.47 Å. All Ni(1)-Ni(2) bond lengths are 2.41 Å. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to three equivalent Eu(1) and six equivalent Ni(1) atoms.