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DOE OSTI2020

Materials Data on Sm2C3 by Materials Project

Sm2C3 is Plutonium carbide structured and crystallizes in the cubic I-43d space group. The structure is three-dimensional. Sm3+ is bonded in a 9-coordinate geometry to nine equivalent C2- atoms. There are a spread of Sm–C bond distances ranging from 2.59–2.90 Å. C2- is bonded to six equivalent Sm3+ and one C2- atom to form a mixture of distorted edge, face, and corner-sharing CSm6C trigonal bipyramids. The C–C bond length is 1.33 Å.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on SmC6 by Materials Project

SmC6 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Sm2+ is bonded to twelve equivalent C+0.33- atoms to form face-sharing SmC12 cuboctahedra. All Sm–C bond lengths are 2.75 Å. C+0.33- is bonded in a 3-coordinate geometry to two equivalent Sm2+ and three equivalent C+0.33- atoms. There is two shorter (1.44 Å) and one longer (1.45 Å) C–C bond length.

36 MATERIALS SCIENCE↗