Materials Data on Ba3Sm by Materials Project

Abstract

Ba3Sm is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent Ba sites. In the first Ba site, Ba is bonded to eight Ba and four equivalent Sm atoms to form BaBa8Sm4 cuboctahedra that share corners with twelve equivalent BaBa8Sm4 cuboctahedra, edges with eight equivalent SmBa12 cuboctahedra, edges with sixteen BaBa8Sm4 cuboctahedra, faces with four equivalent SmBa12 cuboctahedra, and faces with fourteen BaBa8Sm4 cuboctahedra. There are four shorter (4.21 Å) and four longer (4.23 Å) Ba–Ba bond lengths. All Ba–Sm bond lengths are 4.21 Å. In the second Ba site, Ba is bonded to eight equivalent Ba and four equivalent Sm atoms to form BaBa8Sm4 cuboctahedra that share corners with four equivalent BaBa8Sm4 cuboctahedra, corners with eight equivalent SmBa12 cuboctahedra, edges with twenty-four BaBa8Sm4 cuboctahedra, faces with six equivalent SmBa12 cuboctahedra, and faces with twelve BaBa8Sm4 cuboctahedra. All Ba–Sm bond lengths are 4.23 Å. Sm is bonded to twelve Ba atoms to form SmBa12 cuboctahedra that share corners with four equivalent SmBa12 cuboctahedra, corners with eight equivalent BaBa8Sm4 cuboctahedra, edges with eight equivalent SmBa12 cuboctahedra, edges with sixteen equivalent BaBa8Sm4 cuboctahedra, faces with four equivalent SmBa12 cuboctahedra, and faces with fourteen BaBa8Sm4 cuboctahedra.