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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on ScNb by Materials Project

ScNb crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Sc is bonded to six equivalent Sc and six equivalent Nb atoms to form ScSc6Nb6 cuboctahedra that share corners with eighteen equivalent ScSc6Nb6 cuboctahedra, edges with six equivalent ScSc6Nb6 cuboctahedra, edges with twelve equivalent NbSc6Nb6 cuboctahedra, faces with eight equivalent ScSc6Nb6 cuboctahedra, and faces with twelve equivalent NbSc6Nb6 cuboctahedra. All Sc–Sc bond lengths are 3.07 Å. All Sc–Nb bond lengths are 3.09 Å. Nb is bonded to six equivalent Sc and six equivalent Nb atoms to form NbSc6Nb6 cuboctahedra that share corners with eighteen equivalent NbSc6Nb6 cuboctahedra, edges with six equivalent NbSc6Nb6 cuboctahedra, edges with twelve equivalent ScSc6Nb6 cuboctahedra, faces with eight equivalent NbSc6Nb6 cuboctahedra, and faces with twelve equivalent ScSc6Nb6 cuboctahedra. All Nb–Nb bond lengths are 3.07 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ScNb(NiSn)2 by Materials Project

ScNb(NiSn)2 is half-Heusler-derived structured and crystallizes in the trigonal R3m space group. The structure is three-dimensional. Sc is bonded in a 4-coordinate geometry to four Ni and six Sn atoms. There are three shorter (2.65 Å) and one longer (2.73 Å) Sc–Ni bond lengths. There are three shorter (3.03 Å) and three longer (3.04 Å) Sc–Sn bond lengths. Nb is bonded to four Ni and six Sn atoms to form distorted face-sharing NbNi4Sn6 tetrahedra. There are one shorter (2.52 Å) and three longer (2.61 Å) Nb–Ni bond lengths. There are three shorter (3.01 Å) and three longer (3.05 Å) Nb–Sn bond lengths. There are two inequivalent Ni sites. In the first Ni site, Ni is bonded in a body-centered cubic geometry to one Sc, three equivalent Nb, and four Sn atoms. There are one shorter (2.55 Å) and three longer (2.65 Å) Ni–Sn bond lengths. In the second Ni site, Ni is bonded in a body-centered cubic geometry to three equivalent Sc, one Nb, and four Sn atoms. There are three shorter (2.60 Å) and one longer (2.72 Å) Ni–Sn bond lengths. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a 10-coordinate geometry to three equivalent Sc, three equivalent Nb, and four Ni atoms. In the second Sn site, Sn is bonded in a 10-coordinate geometry to three equivalent Sc, three equivalent Nb, and four Ni atoms.

36 MATERIALS SCIENCE↗