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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ac3Sm by Materials Project

Ac3Sm is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ac is bonded to eight equivalent Ac and four equivalent Sm atoms to form AcAc8Sm4 cuboctahedra that share corners with four equivalent SmAc12 cuboctahedra, corners with fourteen equivalent AcAc8Sm4 cuboctahedra, edges with six equivalent SmAc12 cuboctahedra, edges with twelve equivalent AcAc8Sm4 cuboctahedra, faces with four equivalent SmAc12 cuboctahedra, and faces with sixteen equivalent AcAc8Sm4 cuboctahedra. There are a spread of Ac–Ac bond distances ranging from 3.89–3.98 Å. There are two shorter (3.88 Å) and two longer (3.93 Å) Ac–Sm bond lengths. Sm is bonded to twelve equivalent Ac atoms to form SmAc12 cuboctahedra that share corners with six equivalent SmAc12 cuboctahedra, corners with twelve equivalent AcAc8Sm4 cuboctahedra, edges with eighteen equivalent AcAc8Sm4 cuboctahedra, faces with eight equivalent SmAc12 cuboctahedra, and faces with twelve equivalent AcAc8Sm4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AcSm3 by Materials Project

AcSm3 is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ac is bonded to twelve Sm atoms to form AcSm12 cuboctahedra that share corners with four equivalent AcSm12 cuboctahedra, corners with eight equivalent SmAc4Sm8 cuboctahedra, edges with eight equivalent AcSm12 cuboctahedra, edges with sixteen equivalent SmAc4Sm8 cuboctahedra, faces with four equivalent AcSm12 cuboctahedra, and faces with fourteen SmAc4Sm8 cuboctahedra. There are four shorter (3.71 Å) and eight longer (3.72 Å) Ac–Sm bond lengths. There are two inequivalent Sm sites. In the first Sm site, Sm is bonded to four equivalent Ac and eight Sm atoms to form SmAc4Sm8 cuboctahedra that share corners with twelve equivalent SmAc4Sm8 cuboctahedra, edges with eight equivalent AcSm12 cuboctahedra, edges with sixteen SmAc4Sm8 cuboctahedra, faces with four equivalent AcSm12 cuboctahedra, and faces with fourteen SmAc4Sm8 cuboctahedra. There are four shorter (3.71 Å) and four longer (3.72 Å) Sm–Sm bond lengths. In the second Sm site, Sm is bonded to four equivalent Ac and eight equivalent Sm atoms to form SmAc4Sm8 cuboctahedra that share corners with four equivalent SmAc4Sm8 cuboctahedra, corners with eight equivalent AcSm12 cuboctahedra, edges with twenty-four SmAc4Sm8 cuboctahedra, faces with six equivalent AcSm12 cuboctahedra, and faces with twelve SmAc4Sm8 cuboctahedra.

36 MATERIALS SCIENCE↗