Np3Tm 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 Tm(1) atoms to form NpTm4Np8 cuboctahedra that share corners with twelve equivalent Np(1)Tm4Np8 cuboctahedra, edges with eight equivalent Tm(1)Np12 cuboctahedra, edges with sixteen equivalent Np(1)Tm4Np8 cuboctahedra, faces with four equivalent Tm(1)Np12 cuboctahedra, and faces with fourteen equivalent Np(1)Tm4Np8 cuboctahedra. Tm(1) is bonded to twelve equivalent Np(1) atoms to form TmNp12 cuboctahedra that share corners with twelve equivalent Tm(1)Np12 cuboctahedra, edges with twenty-four equivalent Np(1)Tm4Np8 cuboctahedra, faces with six equivalent Tm(1)Np12 cuboctahedra, and faces with twelve equivalent Np(1)Tm4Np8 cuboctahedra.
Np3Tm 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 Tm(1) atoms to form NpTm4Np8 cuboctahedra that share corners with twelve equivalent Np(1)Tm4Np8 cuboctahedra, edges with eight equivalent Tm(1)Np12 cuboctahedra, edges with sixteen equivalent Np(1)Tm4Np8 cuboctahedra, faces with four equivalent Tm(1)Np12 cuboctahedra, and faces with fourteen equivalent Np(1)Tm4Np8 cuboctahedra. All Np(1)-Np(1) bond lengths are 3.26 Å. All Np(1)-Tm(1) bond lengths are 3.26 Å. Tm(1) is bonded to twelve equivalent Np(1) atoms to form TmNp12 cuboctahedra that share corners with twelve equivalent Tm(1)Np12 cuboctahedra, edges with twenty-four equivalent Np(1)Tm4Np8 cuboctahedra, faces with six equivalent Tm(1)Np12 cuboctahedra, and faces with twelve equivalent Np(1)Tm4Np8 cuboctahedra.