Np3Y is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. Np(1) is bonded to eight equivalent Np(1) and four equivalent Y(1) atoms to form NpY4Np8 cuboctahedra that share corners with twelve equivalent Np(1)Y4Np8 cuboctahedra, edges with eight equivalent Y(1)Np12 cuboctahedra, edges with sixteen equivalent Np(1)Y4Np8 cuboctahedra, faces with four equivalent Y(1)Np12 cuboctahedra, and faces with fourteen equivalent Np(1)Y4Np8 cuboctahedra. Y(1) is bonded to twelve equivalent Np(1) atoms to form YNp12 cuboctahedra that share corners with twelve equivalent Y(1)Np12 cuboctahedra, edges with twenty-four equivalent Np(1)Y4Np8 cuboctahedra, faces with six equivalent Y(1)Np12 cuboctahedra, and faces with twelve equivalent Np(1)Y4Np8 cuboctahedra.
Np3Y is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. Np(1) is bonded to eight equivalent Np(1) and four equivalent Y(1) atoms to form NpY4Np8 cuboctahedra that share corners with twelve equivalent Np(1)Y4Np8 cuboctahedra, edges with eight equivalent Y(1)Np12 cuboctahedra, edges with sixteen equivalent Np(1)Y4Np8 cuboctahedra, faces with four equivalent Y(1)Np12 cuboctahedra, and faces with fourteen equivalent Np(1)Y4Np8 cuboctahedra. All Np(1)-Np(1) bond lengths are 3.30 Å. All Np(1)-Y(1) bond lengths are 3.30 Å. Y(1) is bonded to twelve equivalent Np(1) atoms to form YNp12 cuboctahedra that share corners with twelve equivalent Y(1)Np12 cuboctahedra, edges with twenty-four equivalent Np(1)Y4Np8 cuboctahedra, faces with six equivalent Y(1)Np12 cuboctahedra, and faces with twelve equivalent Np(1)Y4Np8 cuboctahedra.