Pm3Zn is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Pm sites. In the first Pm site, Pm(1) is bonded to four equivalent Pm(1), four equivalent Pm(2), and four equivalent Zn(1) atoms to form distorted PmPm8Zn4 cuboctahedra that share corners with twelve equivalent Pm(1)Pm8Zn4 cuboctahedra, edges with eight equivalent Pm(1)Pm8Zn4 cuboctahedra, edges with eight equivalent Zn(1)Pm12 cuboctahedra, faces with four equivalent Zn(1)Pm12 cuboctahedra, and faces with ten equivalent Pm(1)Pm8Zn4 cuboctahedra. In the second Pm site, Pm(2) is bonded in a distorted square co-planar geometry to eight equivalent Pm(1) and four equivalent Zn(1) atoms. Zn(1) is bonded to four equivalent Pm(2) and eight equivalent Pm(1) atoms to form ZnPm12 cuboctahedra that share corners with four equivalent Zn(1)Pm12 cuboctahedra, edges with eight equivalent Zn(1)Pm12 cuboctahedra, edges with sixteen equivalent Pm(1)Pm8Zn4 cuboctahedra, faces with four equivalent Zn(1)Pm12 cuboctahedra, and faces with eight equivalent Pm(1)Pm8Zn4 cuboctahedra.
Pm3Zn is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Pm sites. In the first Pm site, Pm(1) is bonded to four equivalent Pm(1), four equivalent Pm(2), and four equivalent Zn(1) atoms to form distorted PmPm8Zn4 cuboctahedra that share corners with twelve equivalent Pm(1)Pm8Zn4 cuboctahedra, edges with eight equivalent Pm(1)Pm8Zn4 cuboctahedra, edges with eight equivalent Zn(1)Pm12 cuboctahedra, faces with four equivalent Zn(1)Pm12 cuboctahedra, and faces with ten equivalent Pm(1)Pm8Zn4 cuboctahedra. All Pm(1)-Pm(1) bond lengths are 3.38 Å. All Pm(1)-Pm(2) bond lengths are 3.46 Å. All Pm(1)-Zn(1) bond lengths are 3.46 Å. In the second Pm site, Pm(2) is bonded in a distorted square co-planar geometry to eight equivalent Pm(1) and four equivalent Zn(1) atoms. All Pm(2)-Zn(1) bond lengths are 3.38 Å. Zn(1) is bonded to four equivalent Pm(2) and eight equivalent Pm(1) atoms to form ZnPm12 cuboctahedra that share corners with four equivalent Zn(1)Pm12 cuboctahedra, edges with eight equivalent Zn(1)Pm12 cuboctahedra, edges with sixteen equivalent Pm(1)Pm8Zn4 cuboctahedra, faces with four equivalent Zn(1)Pm12 cuboctahedra, and faces with eight equivalent Pm(1)Pm8Zn4 cuboctahedra.