Materials Data on PmNp by Materials Project
NpPm is Magnesium-derived structured and crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Np is bonded to six equivalent Np and six equivalent Pm atoms to form NpPm6Np6 cuboctahedra that share corners with eighteen equivalent NpPm6Np6 cuboctahedra, edges with six equivalent NpPm6Np6 cuboctahedra, edges with twelve equivalent PmPm6Np6 cuboctahedra, faces with eight equivalent NpPm6Np6 cuboctahedra, and faces with twelve equivalent PmPm6Np6 cuboctahedra. All Np–Np bond lengths are 3.37 Å. All Np–Pm bond lengths are 3.55 Å. Pm is bonded to six equivalent Np and six equivalent Pm atoms to form PmPm6Np6 cuboctahedra that share corners with eighteen equivalent PmPm6Np6 cuboctahedra, edges with six equivalent PmPm6Np6 cuboctahedra, edges with twelve equivalent NpPm6Np6 cuboctahedra, faces with eight equivalent PmPm6Np6 cuboctahedra, and faces with twelve equivalent NpPm6Np6 cuboctahedra. All Pm–Pm bond lengths are 3.37 Å.