PaCe3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Pa(1) is bonded to twelve equivalent Ce(1) atoms to form PaCe12 cuboctahedra that share corners with six equivalent Pa(1)Ce12 cuboctahedra, corners with twelve equivalent Ce(1)Ce8Pa4 cuboctahedra, edges with eighteen equivalent Ce(1)Ce8Pa4 cuboctahedra, faces with eight equivalent Pa(1)Ce12 cuboctahedra, and faces with twelve equivalent Ce(1)Ce8Pa4 cuboctahedra. Ce(1) is bonded to four equivalent Pa(1) and eight equivalent Ce(1) atoms to form distorted CeCe8Pa4 cuboctahedra that share corners with four equivalent Pa(1)Ce12 cuboctahedra, corners with fourteen equivalent Ce(1)Ce8Pa4 cuboctahedra, edges with six equivalent Pa(1)Ce12 cuboctahedra, edges with twelve equivalent Ce(1)Ce8Pa4 cuboctahedra, faces with four equivalent Pa(1)Ce12 cuboctahedra, and faces with sixteen equivalent Ce(1)Ce8Pa4 cuboctahedra.
PaCe3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Pa(1) is bonded to twelve equivalent Ce(1) atoms to form PaCe12 cuboctahedra that share corners with six equivalent Pa(1)Ce12 cuboctahedra, corners with twelve equivalent Ce(1)Ce8Pa4 cuboctahedra, edges with eighteen equivalent Ce(1)Ce8Pa4 cuboctahedra, faces with eight equivalent Pa(1)Ce12 cuboctahedra, and faces with twelve equivalent Ce(1)Ce8Pa4 cuboctahedra. There are six shorter (3.25 Å) and six longer (3.38 Å) Pa(1)-Ce(1) bond lengths. Ce(1) is bonded to four equivalent Pa(1) and eight equivalent Ce(1) atoms to form distorted CeCe8Pa4 cuboctahedra that share corners with four equivalent Pa(1)Ce12 cuboctahedra, corners with fourteen equivalent Ce(1)Ce8Pa4 cuboctahedra, edges with six equivalent Pa(1)Ce12 cuboctahedra, edges with twelve equivalent Ce(1)Ce8Pa4 cuboctahedra, faces with four equivalent Pa(1)Ce12 cuboctahedra, and faces with sixteen equivalent Ce(1)Ce8Pa4 cuboctahedra. There are a spread of Ce(1)-Ce(1) bond distances ranging from 3.19-3.42 Å.