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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Sm(BC)2 by Materials Project

SmB2C2 crystallizes in the tetragonal P4/mbm space group. The structure is three-dimensional. Sm2+ is bonded in a body-centered cubic geometry to eight equivalent C4- atoms. All Sm–C bond lengths are 2.75 Å. B3+ is bonded in a distorted trigonal planar geometry to three equivalent C4- atoms. There is one shorter (1.53 Å) and two longer (1.61 Å) B–C bond length. C4- is bonded in a 3-coordinate geometry to four equivalent Sm2+ and three equivalent B3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm(BC)2 by Materials Project

SmB2C2 crystallizes in the tetragonal P4_2/mmc space group. The structure is three-dimensional. Sm2+ is bonded in a 8-coordinate geometry to eight equivalent C4- atoms. All Sm–C bond lengths are 2.77 Å. B3+ is bonded in an L-shaped geometry to two equivalent C4- atoms. Both B–C bond lengths are 1.61 Å. C4- is bonded in a 2-coordinate geometry to four equivalent Sm2+, two equivalent B3+, and one C4- atom. The C–C bond length is 1.43 Å.

36 MATERIALS SCIENCE↗