BaPm crystallizes in the hexagonal P-6m2 space group. Ba(1) is bonded to six equivalent Ba(1) and six equivalent Pm(1) atoms to form BaBa6Pm6 cuboctahedra that share corners with eighteen equivalent Ba(1)Ba6Pm6 cuboctahedra, edges with six equivalent Ba(1)Ba6Pm6 cuboctahedra, edges with twelve equivalent Pm(1)Ba6Pm6 cuboctahedra, faces with eight equivalent Ba(1)Ba6Pm6 cuboctahedra, and faces with twelve equivalent Pm(1)Ba6Pm6 cuboctahedra. Pm(1) is bonded to six equivalent Ba(1) and six equivalent Pm(1) atoms to form PmBa6Pm6 cuboctahedra that share corners with eighteen equivalent Pm(1)Ba6Pm6 cuboctahedra, edges with six equivalent Pm(1)Ba6Pm6 cuboctahedra, edges with twelve equivalent Ba(1)Ba6Pm6 cuboctahedra, faces with eight equivalent Pm(1)Ba6Pm6 cuboctahedra, and faces with twelve equivalent Ba(1)Ba6Pm6 cuboctahedra.
BaPm crystallizes in the hexagonal P-6m2 space group. Ba(1) is bonded to six equivalent Ba(1) and six equivalent Pm(1) atoms to form BaBa6Pm6 cuboctahedra that share corners with eighteen equivalent Ba(1)Ba6Pm6 cuboctahedra, edges with six equivalent Ba(1)Ba6Pm6 cuboctahedra, edges with twelve equivalent Pm(1)Ba6Pm6 cuboctahedra, faces with eight equivalent Ba(1)Ba6Pm6 cuboctahedra, and faces with twelve equivalent Pm(1)Ba6Pm6 cuboctahedra. All Ba(1)-Ba(1) bond lengths are 3.97 Å. All Ba(1)-Pm(1) bond lengths are 3.99 Å. Pm(1) is bonded to six equivalent Ba(1) and six equivalent Pm(1) atoms to form PmBa6Pm6 cuboctahedra that share corners with eighteen equivalent Pm(1)Ba6Pm6 cuboctahedra, edges with six equivalent Pm(1)Ba6Pm6 cuboctahedra, edges with twelve equivalent Ba(1)Ba6Pm6 cuboctahedra, faces with eight equivalent Pm(1)Ba6Pm6 cuboctahedra, and faces with twelve equivalent Ba(1)Ba6Pm6 cuboctahedra. All Pm(1)-Pm(1) bond lengths are 3.97 Å.