Materials Data on Pm3Ag by Materials Project

Pm3Ag is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent Pm sites. In the first Pm site, Pm is bonded to eight Pm and four equivalent Ag atoms to form distorted PmPm8Ag4 cuboctahedra that share corners with twelve equivalent PmPm8Ag4 cuboctahedra, edges with eight equivalent PmPm8Ag4 cuboctahedra, edges with eight equivalent AgPm12 cuboctahedra, faces with four equivalent AgPm12 cuboctahedra, and faces with ten equivalent PmPm8Ag4 cuboctahedra. There are four shorter (3.37 Å) and four longer (3.51 Å) Pm–Pm bond lengths. All Pm–Ag bond lengths are 3.51 Å. In the second Pm site, Pm is bonded in a square co-planar geometry to eight equivalent Pm and four equivalent Ag atoms. All Pm–Ag bond lengths are 3.37 Å. Ag is bonded to twelve Pm atoms to form AgPm12 cuboctahedra that share corners with four equivalent AgPm12 cuboctahedra, edges with eight equivalent AgPm12 cuboctahedra, edges with sixteen equivalent PmPm8Ag4 cuboctahedra, faces with four equivalent AgPm12 cuboctahedra, and faces with eight equivalent PmPm8Ag4 cuboctahedra.