Np3Dy is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Np sites. In the first Np site, Np(1) is bonded to four equivalent Np(1), four equivalent Np(2), and four equivalent Dy(1) atoms to form NpDy4Np8 cuboctahedra that share corners with twelve equivalent Np(1)Dy4Np8 cuboctahedra, edges with eight equivalent Np(1)Dy4Np8 cuboctahedra, edges with eight equivalent Np(2)Dy4Np8 cuboctahedra, edges with eight equivalent Dy(1)Np12 cuboctahedra, faces with four equivalent Np(2)Dy4Np8 cuboctahedra, faces with four equivalent Dy(1)Np12 cuboctahedra, and faces with ten equivalent Np(1)Dy4Np8 cuboctahedra. In the second Np site, Np(2) is bonded to eight equivalent Np(1) and four equivalent Dy(1) atoms to form NpDy4Np8 cuboctahedra that share corners with four equivalent Np(2)Dy4Np8 cuboctahedra, corners with eight equivalent Dy(1)Np12 cuboctahedra, edges with eight equivalent Np(2)Dy4Np8 cuboctahedra, edges with sixteen equivalent Np(1)Dy4Np8 cuboctahedra, faces with four equivalent Np(2)Dy4Np8 cuboctahedra, faces with six equivalent Dy(1)Np12 cuboctahedra, and faces with eight equivalent Np(1)Dy4Np8 cuboctahedra. Dy(1) is bonded to four equivalent Np(2) and eight equivalent Np(1) atoms to form DyNp12 cuboctahedra that share corners with four equivalent Dy(1)Np12 cuboctahedra, corners with eight equivalent Np(2)Dy4Np8 cuboctahedra, edges with eight equivalent Dy(1)Np12 cuboctahedra, edges with sixteen equivalent Np(1)Dy4Np8 cuboctahedra, faces with four equivalent Dy(1)Np12 cuboctahedra, faces with six equivalent Np(2)Dy4Np8 cuboctahedra, and faces with eight equivalent Np(1)Dy4Np8 cuboctahedra.
Np3Dy is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Np sites. In the first Np site, Np(1) is bonded to four equivalent Np(1), four equivalent Np(2), and four equivalent Dy(1) atoms to form NpDy4Np8 cuboctahedra that share corners with twelve equivalent Np(1)Dy4Np8 cuboctahedra, edges with eight equivalent Np(1)Dy4Np8 cuboctahedra, edges with eight equivalent Np(2)Dy4Np8 cuboctahedra, edges with eight equivalent Dy(1)Np12 cuboctahedra, faces with four equivalent Np(2)Dy4Np8 cuboctahedra, faces with four equivalent Dy(1)Np12 cuboctahedra, and faces with ten equivalent Np(1)Dy4Np8 cuboctahedra. All Np(1)-Np(1) bond lengths are 3.21 Å. All Np(1)-Np(2) bond lengths are 3.23 Å. All Np(1)-Dy(1) bond lengths are 3.23 Å. In the second Np site, Np(2) is bonded to eight equivalent Np(1) and four equivalent Dy(1) atoms to form NpDy4Np8 cuboctahedra that share corners with four equivalent Np(2)Dy4Np8 cuboctahedra, corners with eight equivalent Dy(1)Np12 cuboctahedra, edges with eight equivalent Np(2)Dy4Np8 cuboctahedra, edges with sixteen equivalent Np(1)Dy4Np8 cuboctahedra, faces with four equivalent Np(2)Dy4Np8 cuboctahedra, faces with six equivalent Dy(1)Np12 cuboctahedra, and faces with eight equivalent Np(1)Dy4Np8 cuboctahedra. All Np(2)-Dy(1) bond lengths are 3.21 Å. Dy(1) is bonded to four equivalent Np(2) and eight equivalent Np(1) atoms to form DyNp12 cuboctahedra that share corners with four equivalent Dy(1)Np12 cuboctahedra, corners with eight equivalent Np(2)Dy4Np8 cuboctahedra, edges with eight equivalent Dy(1)Np12 cuboctahedra, edges with sixteen equivalent Np(1)Dy4Np8 cuboctahedra, faces with four equivalent Dy(1)Np12 cuboctahedra, faces with six equivalent Np(2)Dy4Np8 cuboctahedra, and faces with eight equivalent Np(1)Dy4Np8 cuboctahedra.