Ac3Nd is Magnesium-derived structured and crystallizes in the hexagonal P6_3/mmc space group. Ac(1) is bonded to eight equivalent Ac(1) and four equivalent Nd(1) atoms to form AcAc8Nd4 cuboctahedra that share corners with four equivalent Nd(1)Ac12 cuboctahedra, corners with fourteen equivalent Ac(1)Ac8Nd4 cuboctahedra, edges with six equivalent Nd(1)Ac12 cuboctahedra, edges with twelve equivalent Ac(1)Ac8Nd4 cuboctahedra, faces with four equivalent Nd(1)Ac12 cuboctahedra, and faces with sixteen equivalent Ac(1)Ac8Nd4 cuboctahedra. Nd(1) is bonded to twelve equivalent Ac(1) atoms to form NdAc12 cuboctahedra that share corners with six equivalent Nd(1)Ac12 cuboctahedra, corners with twelve equivalent Ac(1)Ac8Nd4 cuboctahedra, edges with eighteen equivalent Ac(1)Ac8Nd4 cuboctahedra, faces with eight equivalent Nd(1)Ac12 cuboctahedra, and faces with twelve equivalent Ac(1)Ac8Nd4 cuboctahedra.
Ac3Nd is Magnesium-derived structured and crystallizes in the hexagonal P6_3/mmc space group. Ac(1) is bonded to eight equivalent Ac(1) and four equivalent Nd(1) atoms to form AcAc8Nd4 cuboctahedra that share corners with four equivalent Nd(1)Ac12 cuboctahedra, corners with fourteen equivalent Ac(1)Ac8Nd4 cuboctahedra, edges with six equivalent Nd(1)Ac12 cuboctahedra, edges with twelve equivalent Ac(1)Ac8Nd4 cuboctahedra, faces with four equivalent Nd(1)Ac12 cuboctahedra, and faces with sixteen equivalent Ac(1)Ac8Nd4 cuboctahedra. There are six shorter (3.94 Å) and two longer (4.06 Å) Ac(1)-Ac(1) bond lengths. There are two shorter (3.90 Å) and two longer (4.00 Å) Ac(1)-Nd(1) bond lengths. Nd(1) is bonded to twelve equivalent Ac(1) atoms to form NdAc12 cuboctahedra that share corners with six equivalent Nd(1)Ac12 cuboctahedra, corners with twelve equivalent Ac(1)Ac8Nd4 cuboctahedra, edges with eighteen equivalent Ac(1)Ac8Nd4 cuboctahedra, faces with eight equivalent Nd(1)Ac12 cuboctahedra, and faces with twelve equivalent Ac(1)Ac8Nd4 cuboctahedra.