Pa3Nb is beta-derived structured and crystallizes in the hexagonal P6_3/mmc space group. Pa(1) is bonded to eight equivalent Pa(1) and four equivalent Nb(1) atoms to form distorted PaPa8Nb4 cuboctahedra that share corners with four equivalent Nb(1)Pa12 cuboctahedra, corners with fourteen equivalent Pa(1)Pa8Nb4 cuboctahedra, edges with six equivalent Nb(1)Pa12 cuboctahedra, edges with twelve equivalent Pa(1)Pa8Nb4 cuboctahedra, faces with four equivalent Nb(1)Pa12 cuboctahedra, and faces with sixteen equivalent Pa(1)Pa8Nb4 cuboctahedra. Nb(1) is bonded to twelve equivalent Pa(1) atoms to form NbPa12 cuboctahedra that share corners with six equivalent Nb(1)Pa12 cuboctahedra, corners with twelve equivalent Pa(1)Pa8Nb4 cuboctahedra, edges with eighteen equivalent Pa(1)Pa8Nb4 cuboctahedra, faces with eight equivalent Nb(1)Pa12 cuboctahedra, and faces with twelve equivalent Pa(1)Pa8Nb4 cuboctahedra.
Pa3Nb is beta-derived structured and crystallizes in the hexagonal P6_3/mmc space group. Pa(1) is bonded to eight equivalent Pa(1) and four equivalent Nb(1) atoms to form distorted PaPa8Nb4 cuboctahedra that share corners with four equivalent Nb(1)Pa12 cuboctahedra, corners with fourteen equivalent Pa(1)Pa8Nb4 cuboctahedra, edges with six equivalent Nb(1)Pa12 cuboctahedra, edges with twelve equivalent Pa(1)Pa8Nb4 cuboctahedra, faces with four equivalent Nb(1)Pa12 cuboctahedra, and faces with sixteen equivalent Pa(1)Pa8Nb4 cuboctahedra. There are a spread of Pa(1)-Pa(1) bond distances ranging from 3.00-3.37 Å. There are two shorter (3.12 Å) and two longer (3.30 Å) Pa(1)-Nb(1) bond lengths. Nb(1) is bonded to twelve equivalent Pa(1) atoms to form NbPa12 cuboctahedra that share corners with six equivalent Nb(1)Pa12 cuboctahedra, corners with twelve equivalent Pa(1)Pa8Nb4 cuboctahedra, edges with eighteen equivalent Pa(1)Pa8Nb4 cuboctahedra, faces with eight equivalent Nb(1)Pa12 cuboctahedra, and faces with twelve equivalent Pa(1)Pa8Nb4 cuboctahedra.