Materials Data on AcPm3 by Materials Project
AcPm3 is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ac is bonded to twelve Pm atoms to form AcPm12 cuboctahedra that share corners with four equivalent AcPm12 cuboctahedra, corners with eight equivalent PmAc4Pm8 cuboctahedra, edges with eight equivalent AcPm12 cuboctahedra, edges with sixteen equivalent PmAc4Pm8 cuboctahedra, faces with four equivalent AcPm12 cuboctahedra, and faces with fourteen PmAc4Pm8 cuboctahedra. There are four shorter (3.73 Å) and eight longer (3.74 Å) Ac–Pm bond lengths. There are two inequivalent Pm sites. In the first Pm site, Pm is bonded to four equivalent Ac and eight Pm atoms to form PmAc4Pm8 cuboctahedra that share corners with twelve equivalent PmAc4Pm8 cuboctahedra, edges with eight equivalent AcPm12 cuboctahedra, edges with sixteen PmAc4Pm8 cuboctahedra, faces with four equivalent AcPm12 cuboctahedra, and faces with fourteen PmAc4Pm8 cuboctahedra. There are four shorter (3.73 Å) and four longer (3.74 Å) Pm–Pm bond lengths. In the second Pm site, Pm is bonded to four equivalent Ac and eight equivalent Pm atoms to form PmAc4Pm8 cuboctahedra that share corners with four equivalent PmAc4Pm8 cuboctahedra, corners with eight equivalent AcPm12 cuboctahedra, edges with twenty-four PmAc4Pm8 cuboctahedra, faces with six equivalent AcPm12 cuboctahedra, and faces with twelve PmAc4Pm8 cuboctahedra.