Materials Data on HfNp3 by Materials Project
Np3Hf is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent Np sites. In the first Np site, Np is bonded to eight Np and four equivalent Hf atoms to form NpHf4Np8 cuboctahedra that share corners with twelve equivalent NpHf4Np8 cuboctahedra, edges with eight equivalent HfNp12 cuboctahedra, edges with sixteen NpHf4Np8 cuboctahedra, faces with four equivalent HfNp12 cuboctahedra, and faces with fourteen NpHf4Np8 cuboctahedra. There are four shorter (3.09 Å) and four longer (3.16 Å) Np–Np bond lengths. All Np–Hf bond lengths are 3.16 Å. In the second Np site, Np is bonded to eight equivalent Np and four equivalent Hf atoms to form NpHf4Np8 cuboctahedra that share corners with four equivalent NpHf4Np8 cuboctahedra, corners with eight equivalent HfNp12 cuboctahedra, edges with twenty-four NpHf4Np8 cuboctahedra, faces with six equivalent HfNp12 cuboctahedra, and faces with twelve NpHf4Np8 cuboctahedra. All Np–Hf bond lengths are 3.09 Å. Hf is bonded to twelve Np atoms to form HfNp12 cuboctahedra that share corners with four equivalent HfNp12 cuboctahedra, corners with eight equivalent NpHf4Np8 cuboctahedra, edges with eight equivalent HfNp12 cuboctahedra, edges with sixteen equivalent NpHf4Np8 cuboctahedra, faces with four equivalent HfNp12 cuboctahedra, and faces with fourteen NpHf4Np8 cuboctahedra.