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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Sm(MnGe)2 by Materials Project

SmMn2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sm is bonded in a 8-coordinate geometry to eight equivalent Ge atoms. All Sm–Ge bond lengths are 3.13 Å. Mn is bonded to four equivalent Ge atoms to form a mixture of corner and edge-sharing MnGe4 tetrahedra. All Mn–Ge bond lengths are 2.45 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Sm, four equivalent Mn, and one Ge atom. The Ge–Ge bond length is 2.68 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SmMnGe2 by Materials Project

SmMnGe2 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Sm is bonded in a 10-coordinate geometry to five equivalent Mn and ten Ge atoms. There are one shorter (3.29 Å) and four longer (3.44 Å) Sm–Mn bond lengths. There are a spread of Sm–Ge bond distances ranging from 3.18–3.29 Å. Mn is bonded in a 5-coordinate geometry to five equivalent Sm and five Ge atoms. There are a spread of Mn–Ge bond distances ranging from 2.38–2.42 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a distorted single-bond geometry to six equivalent Sm and one Mn atom. In the second Ge site, Ge is bonded in a 4-coordinate geometry to four equivalent Sm and four equivalent Mn atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SmMnGe by Materials Project

SmMnGe crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Sm is bonded in a 5-coordinate geometry to five equivalent Ge atoms. There are a spread of Sm–Ge bond distances ranging from 3.05–3.07 Å. Mn is bonded in a 4-coordinate geometry to four equivalent Ge atoms. There are a spread of Mn–Ge bond distances ranging from 2.59–2.82 Å. Ge is bonded in a 9-coordinate geometry to five equivalent Sm and four equivalent Mn atoms.

36 MATERIALS SCIENCE↗