ErZn3 crystallizes in the orthorhombic Pnma space group. Er(1) is bonded in a 14-coordinate geometry to four equivalent Zn(3), five equivalent Zn(1), and five equivalent Zn(2) atoms. There are three inequivalent Zn sites. In the first Zn site, Zn(2) is bonded in a 10-coordinate geometry to five equivalent Er(1), two equivalent Zn(1), and three equivalent Zn(3) atoms. In the second Zn site, Zn(1) is bonded to five equivalent Er(1), two equivalent Zn(1), two equivalent Zn(2), and three equivalent Zn(3) atoms to form a mixture of distorted corner and face-sharing ZnEr5Zn7 cuboctahedra. In the third Zn site, Zn(3) is bonded in a 10-coordinate geometry to four equivalent Er(1), three equivalent Zn(1), and three equivalent Zn(2) atoms.
ErZn3 crystallizes in the orthorhombic Pnma space group. Er(1) is bonded in a 14-coordinate geometry to four equivalent Zn(3), five equivalent Zn(1), and five equivalent Zn(2) atoms. There are a spread of Er(1)-Zn(3) bond distances ranging from 2.95-3.13 Å. There are a spread of Er(1)-Zn(1) bond distances ranging from 3.05-3.39 Å. There are a spread of Er(1)-Zn(2) bond distances ranging from 2.93-3.21 Å. There are three inequivalent Zn sites. In the first Zn site, Zn(2) is bonded in a 10-coordinate geometry to five equivalent Er(1), two equivalent Zn(1), and three equivalent Zn(3) atoms. There is one shorter (2.56 Å) and one longer (2.60 Å) Zn(2)-Zn(1) bond length. There are two shorter (2.54 Å) and one longer (2.74 Å) Zn(2)-Zn(3) bond length. In the second Zn site, Zn(1) is bonded to five equivalent Er(1), two equivalent Zn(1), two equivalent Zn(2), and three equivalent Zn(3) atoms to form a mixture of distorted corner and face-sharing ZnEr5Zn7 cuboctahedra. Both Zn(1)-Zn(1) bond lengths are 3.00 Å. There is one shorter (2.55 Å) and two longer (2.75 Å) Zn(1)-Zn(3) bond lengths. In the third Zn site, Zn(3) is bonded in a 10-coordinate geometry to four equivalent Er(1), three equivalent Zn(1), and three equivalent Zn(2) atoms.