Sm3Pr is Magnesium-derived structured and crystallizes in the hexagonal P6_3/mmc space group. Sm(1) is bonded to eight equivalent Sm(1) and four equivalent Pr(1) atoms to form SmPr4Sm8 cuboctahedra that share corners with four equivalent Pr(1)Sm12 cuboctahedra, corners with fourteen equivalent Sm(1)Pr4Sm8 cuboctahedra, edges with six equivalent Pr(1)Sm12 cuboctahedra, edges with twelve equivalent Sm(1)Pr4Sm8 cuboctahedra, faces with four equivalent Pr(1)Sm12 cuboctahedra, and faces with sixteen equivalent Sm(1)Pr4Sm8 cuboctahedra. Pr(1) is bonded to twelve equivalent Sm(1) atoms to form PrSm12 cuboctahedra that share corners with six equivalent Pr(1)Sm12 cuboctahedra, corners with twelve equivalent Sm(1)Pr4Sm8 cuboctahedra, edges with eighteen equivalent Sm(1)Pr4Sm8 cuboctahedra, faces with eight equivalent Pr(1)Sm12 cuboctahedra, and faces with twelve equivalent Sm(1)Pr4Sm8 cuboctahedra.
Sm3Pr is Magnesium-derived structured and crystallizes in the hexagonal P6_3/mmc space group. Sm(1) is bonded to eight equivalent Sm(1) and four equivalent Pr(1) atoms to form SmPr4Sm8 cuboctahedra that share corners with four equivalent Pr(1)Sm12 cuboctahedra, corners with fourteen equivalent Sm(1)Pr4Sm8 cuboctahedra, edges with six equivalent Pr(1)Sm12 cuboctahedra, edges with twelve equivalent Sm(1)Pr4Sm8 cuboctahedra, faces with four equivalent Pr(1)Sm12 cuboctahedra, and faces with sixteen equivalent Sm(1)Pr4Sm8 cuboctahedra. There are a spread of Sm(1)-Sm(1) bond distances ranging from 3.62-3.73 Å. There are two shorter (3.63 Å) and two longer (3.72 Å) Sm(1)-Pr(1) bond lengths. Pr(1) is bonded to twelve equivalent Sm(1) atoms to form PrSm12 cuboctahedra that share corners with six equivalent Pr(1)Sm12 cuboctahedra, corners with twelve equivalent Sm(1)Pr4Sm8 cuboctahedra, edges with eighteen equivalent Sm(1)Pr4Sm8 cuboctahedra, faces with eight equivalent Pr(1)Sm12 cuboctahedra, and faces with twelve equivalent Sm(1)Pr4Sm8 cuboctahedra.