YZn5 crystallizes in the hexagonal P6_3/mmc space group. Y(1) is bonded in a 14-coordinate geometry to two equivalent Zn(2), two equivalent Zn(4), four equivalent Zn(3), and six equivalent Zn(5) atoms. There are five inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 6-coordinate geometry to six equivalent Zn(5) atoms. In the second Zn site, Zn(2) is bonded in a 12-coordinate geometry to three equivalent Y(1), three equivalent Zn(3), three equivalent Zn(4), and three equivalent Zn(5) atoms. In the third Zn site, Zn(3) is bonded to four equivalent Y(1), two equivalent Zn(2), two equivalent Zn(4), and four equivalent Zn(5) atoms to form ZnY4Zn8 cuboctahedra that share corners with four equivalent Zn(3)Y4Zn8 cuboctahedra, corners with ten equivalent Zn(5)Y3Zn9 cuboctahedra, edges with four equivalent Zn(5)Y3Zn9 cuboctahedra, faces with six equivalent Zn(3)Y4Zn8 cuboctahedra, and faces with eight equivalent Zn(5)Y3Zn9 cuboctahedra. In the fourth Zn site, Zn(4) is bonded in a 12-coordinate geometry to two equivalent Y(1), two equivalent Zn(2), two equivalent Zn(3), two equivalent Zn(4), and four equivalent Zn(5) atoms. In the fifth Zn site, Zn(5) is bonded to three equivalent Y(1), one Zn(1), one Zn(2), two equivalent Zn(3), two equivalent Zn(4), and three equivalent Zn(5) atoms to form distorted ZnY3Zn9 cuboctahedra that share corners with five equivalent Zn(3)Y4Zn8 cuboctahedra, corners with eight equivalent Zn(5)Y3Zn9 cuboctahedra, edges with two equivalent Zn(3)Y4Zn8 cuboctahedra, edges with four equivalent Zn(5)Y3Zn9 cuboctahedra, faces with four equivalent Zn(3)Y4Zn8 cuboctahedra, and faces with seven equivalent Zn(5)Y3Zn9 cuboctahedra.
YZn5 crystallizes in the hexagonal P6_3/mmc space group. Y(1) is bonded in a 14-coordinate geometry to two equivalent Zn(2), two equivalent Zn(4), four equivalent Zn(3), and six equivalent Zn(5) atoms. Both Y(1)-Zn(2) bond lengths are 3.06 Å. Both Y(1)-Zn(4) bond lengths are 3.13 Å. All Y(1)-Zn(3) bond lengths are 3.28 Å. There are four shorter (3.04 Å) and two longer (3.10 Å) Y(1)-Zn(5) bond lengths. There are five inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 6-coordinate geometry to six equivalent Zn(5) atoms. All Zn(1)-Zn(5) bond lengths are 2.60 Å. In the second Zn site, Zn(2) is bonded in a 12-coordinate geometry to three equivalent Y(1), three equivalent Zn(3), three equivalent Zn(4), and three equivalent Zn(5) atoms. All Zn(2)-Zn(3) bond lengths are 2.54 Å. All Zn(2)-Zn(4) bond lengths are 2.80 Å. All Zn(2)-Zn(5) bond lengths are 2.79 Å. In the third Zn site, Zn(3) is bonded to four equivalent Y(1), two equivalent Zn(2), two equivalent Zn(4), and four equivalent Zn(5) atoms to form ZnY4Zn8 cuboctahedra that share corners with four equivalent Zn(3)Y4Zn8 cuboctahedra, corners with ten equivalent Zn(5)Y3Zn9 cuboctahedra, edges with four equivalent Zn(5)Y3Zn9 cuboctahedra, faces with six equivalent Zn(3)Y4Zn8 cuboctahedra, and faces with eight equivalent Zn(5)Y3Zn9 cuboctahedra. Both Zn(3)-Zn(4) bond lengths are 2.47 Å. All Zn(3)-Zn(5) bond lengths are 2.71 Å. In the fourth Zn site, Zn(4) is bonded in a 12-coordinate geometry to two equivalent Y(1), two equivalent Zn(2), two equivalent Zn(3), two equivalent Zn(4), and four equivalent Zn(5) atoms. Both Zn(4)-Zn(4) bond lengths are 2.59 Å. All Zn(4)-Zn(5) bond lengths are 2.68 Å. In the fifth Zn site, Zn(5) is bonded to three equivalent Y(1), one Zn(1), one Zn(2), two equivalent Zn(3), two equivalent Zn(4), and three equivalent Zn(5) atoms to form distorted ZnY3Zn9 cuboctahedra that share corners with five equivalent Zn(3)Y4Zn8 cuboctahedra, corners with eight equivalent Zn(5)Y3Zn9 cuboctahedra, edges with two equivalent Zn(3)Y4Zn8 cuboctahedra, edges with four equivalent Zn(5)Y3Zn9 cuboctahedra, faces with four equivalent Zn(3)Y4Zn8 cuboctahedra, and faces with seven equivalent Zn(5)Y3Zn9 cuboctahedra. There is one shorter (2.82 Å) and two longer (2.97 Å) Zn(5)-Zn(5) bond lengths.