Eu3Zr is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to four equivalent Eu(1), four equivalent Eu(2), and four equivalent Zr(1) atoms to form EuEu8Zr4 cuboctahedra that share corners with twelve equivalent Eu(1)Eu8Zr4 cuboctahedra, edges with eight equivalent Eu(1)Eu8Zr4 cuboctahedra, edges with eight equivalent Eu(2)Eu8Zr4 cuboctahedra, edges with eight equivalent Zr(1)Eu12 cuboctahedra, faces with four equivalent Eu(2)Eu8Zr4 cuboctahedra, faces with four equivalent Zr(1)Eu12 cuboctahedra, and faces with ten equivalent Eu(1)Eu8Zr4 cuboctahedra. In the second Eu site, Eu(2) is bonded to eight equivalent Eu(1) and four equivalent Zr(1) atoms to form EuEu8Zr4 cuboctahedra that share corners with four equivalent Eu(2)Eu8Zr4 cuboctahedra, corners with eight equivalent Zr(1)Eu12 cuboctahedra, edges with eight equivalent Eu(2)Eu8Zr4 cuboctahedra, edges with sixteen equivalent Eu(1)Eu8Zr4 cuboctahedra, faces with four equivalent Eu(2)Eu8Zr4 cuboctahedra, faces with six equivalent Zr(1)Eu12 cuboctahedra, and faces with eight equivalent Eu(1)Eu8Zr4 cuboctahedra. Zr(1) is bonded to four equivalent Eu(2) and eight equivalent Eu(1) atoms to form ZrEu12 cuboctahedra that share corners with four equivalent Zr(1)Eu12 cuboctahedra, corners with eight equivalent Eu(2)Eu8Zr4 cuboctahedra, edges with eight equivalent Zr(1)Eu12 cuboctahedra, edges with sixteen equivalent Eu(1)Eu8Zr4 cuboctahedra, faces with four equivalent Zr(1)Eu12 cuboctahedra, faces with six equivalent Eu(2)Eu8Zr4 cuboctahedra, and faces with eight equivalent Eu(1)Eu8Zr4 cuboctahedra.
Eu3Zr is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to four equivalent Eu(1), four equivalent Eu(2), and four equivalent Zr(1) atoms to form EuEu8Zr4 cuboctahedra that share corners with twelve equivalent Eu(1)Eu8Zr4 cuboctahedra, edges with eight equivalent Eu(1)Eu8Zr4 cuboctahedra, edges with eight equivalent Eu(2)Eu8Zr4 cuboctahedra, edges with eight equivalent Zr(1)Eu12 cuboctahedra, faces with four equivalent Eu(2)Eu8Zr4 cuboctahedra, faces with four equivalent Zr(1)Eu12 cuboctahedra, and faces with ten equivalent Eu(1)Eu8Zr4 cuboctahedra. All Eu(1)-Eu(1) bond lengths are 3.67 Å. All Eu(1)-Eu(2) bond lengths are 3.64 Å. All Eu(1)-Zr(1) bond lengths are 3.64 Å. In the second Eu site, Eu(2) is bonded to eight equivalent Eu(1) and four equivalent Zr(1) atoms to form EuEu8Zr4 cuboctahedra that share corners with four equivalent Eu(2)Eu8Zr4 cuboctahedra, corners with eight equivalent Zr(1)Eu12 cuboctahedra, edges with eight equivalent Eu(2)Eu8Zr4 cuboctahedra, edges with sixteen equivalent Eu(1)Eu8Zr4 cuboctahedra, faces with four equivalent Eu(2)Eu8Zr4 cuboctahedra, faces with six equivalent Zr(1)Eu12 cuboctahedra, and faces with eight equivalent Eu(1)Eu8Zr4 cuboctahedra. All Eu(2)-Zr(1) bond lengths are 3.67 Å. Zr(1) is bonded to four equivalent Eu(2) and eight equivalent Eu(1) atoms to form ZrEu12 cuboctahedra that share corners with four equivalent Zr(1)Eu12 cuboctahedra, corners with eight equivalent Eu(2)Eu8Zr4 cuboctahedra, edges with eight equivalent Zr(1)Eu12 cuboctahedra, edges with sixteen equivalent Eu(1)Eu8Zr4 cuboctahedra, faces with four equivalent Zr(1)Eu12 cuboctahedra, faces with six equivalent Eu(2)Eu8Zr4 cuboctahedra, and faces with eight equivalent Eu(1)Eu8Zr4 cuboctahedra.