Materials Data on Ac3Pm by Materials Project
Ac3Pm is Magnesium-derived structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ac is bonded to eight equivalent Ac and four equivalent Pm atoms to form AcAc8Pm4 cuboctahedra that share corners with four equivalent PmAc12 cuboctahedra, corners with fourteen equivalent AcAc8Pm4 cuboctahedra, edges with six equivalent PmAc12 cuboctahedra, edges with twelve equivalent AcAc8Pm4 cuboctahedra, faces with four equivalent PmAc12 cuboctahedra, and faces with sixteen equivalent AcAc8Pm4 cuboctahedra. There are a spread of Ac–Ac bond distances ranging from 3.88–3.96 Å. There are two shorter (3.91 Å) and two longer (3.92 Å) Ac–Pm bond lengths. Pm is bonded to twelve equivalent Ac atoms to form PmAc12 cuboctahedra that share corners with six equivalent PmAc12 cuboctahedra, corners with twelve equivalent AcAc8Pm4 cuboctahedra, edges with eighteen equivalent AcAc8Pm4 cuboctahedra, faces with eight equivalent PmAc12 cuboctahedra, and faces with twelve equivalent AcAc8Pm4 cuboctahedra.