Ca2Eu(Ni2Zn3)3 crystallizes in the hexagonal P6/mmm space group. Ca(1) is bonded in a 18-coordinate geometry to six equivalent Ni(1), six equivalent Zn(1), and six equivalent Zn(2) atoms. Eu(1) is bonded in a hexagonal planar geometry to six equivalent Ni(1) atoms. Ni(1) is bonded in a 9-coordinate geometry to two equivalent Ca(1), one Eu(1), two equivalent Zn(2), and four equivalent Zn(1) atoms. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 4-coordinate geometry to two equivalent Ca(1) and four equivalent Ni(1) atoms. In the second Zn site, Zn(2) is bonded to four equivalent Ca(1) and four equivalent Ni(1) atoms to form a mixture of distorted corner, edge, and face-sharing ZnCa4Ni4 cuboctahedra.
Ca2Eu(Ni2Zn3)3 crystallizes in the hexagonal P6/mmm space group. Ca(1) is bonded in a 18-coordinate geometry to six equivalent Ni(1), six equivalent Zn(1), and six equivalent Zn(2) atoms. All Ca(1)-Ni(1) bond lengths are 3.19 Å. All Ca(1)-Zn(1) bond lengths are 3.25 Å. All Ca(1)-Zn(2) bond lengths are 3.37 Å. Eu(1) is bonded in a hexagonal planar geometry to six equivalent Ni(1) atoms. All Eu(1)-Ni(1) bond lengths are 2.88 Å. Ni(1) is bonded in a 9-coordinate geometry to two equivalent Ca(1), one Eu(1), two equivalent Zn(2), and four equivalent Zn(1) atoms. Both Ni(1)-Zn(2) bond lengths are 2.53 Å. All Ni(1)-Zn(1) bond lengths are 2.55 Å. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 4-coordinate geometry to two equivalent Ca(1) and four equivalent Ni(1) atoms. In the second Zn site, Zn(2) is bonded to four equivalent Ca(1) and four equivalent Ni(1) atoms to form a mixture of distorted corner, edge, and face-sharing ZnCa4Ni4 cuboctahedra.