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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on TmAlNi4 by Materials Project

TmNi4Al crystallizes in the orthorhombic Cmmm space group. The structure is three-dimensional. Tm is bonded in a 6-coordinate geometry to fourteen Ni atoms. There are a spread of Tm–Ni bond distances ranging from 2.78–3.15 Å. There are two inequivalent Ni sites. In the first Ni site, Ni is bonded in a 12-coordinate geometry to three equivalent Tm, seven Ni, and two equivalent Al atoms. There are a spread of Ni–Ni bond distances ranging from 2.46–2.85 Å. Both Ni–Al bond lengths are 2.44 Å. In the second Ni site, Ni is bonded to four equivalent Tm, six Ni, and two equivalent Al atoms to form a mixture of distorted corner, edge, and face-sharing NiTm4Al2Ni6 cuboctahedra. Both Ni–Ni bond lengths are 2.49 Å. Both Ni–Al bond lengths are 2.43 Å. Al is bonded in a 12-coordinate geometry to eight Ni atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TmAlNi4 by Materials Project

TmNi4Al crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Tm is bonded in a 6-coordinate geometry to fifteen Ni and three equivalent Al atoms. There are three shorter (2.90 Å) and twelve longer (3.17 Å) Tm–Ni bond lengths. All Tm–Al bond lengths are 2.90 Å. There are two inequivalent Ni sites. In the first Ni site, Ni is bonded to three equivalent Tm, six equivalent Ni, and three equivalent Al atoms to form NiTm3Al3Ni6 cuboctahedra that share corners with nine equivalent AlTm3Ni9 cuboctahedra, corners with twelve equivalent NiTm4Al2Ni6 cuboctahedra, edges with six equivalent NiTm3Al3Ni6 cuboctahedra, faces with three equivalent AlTm3Ni9 cuboctahedra, and faces with twenty NiTm3Al3Ni6 cuboctahedra. All Ni–Ni bond lengths are 2.40 Å. All Ni–Al bond lengths are 2.90 Å. In the second Ni site, Ni is bonded to four equivalent Tm, six Ni, and two equivalent Al atoms to form distorted NiTm4Al2Ni6 cuboctahedra that share corners with four equivalent AlTm3Ni9 cuboctahedra, corners with twenty NiTm3Al3Ni6 cuboctahedra, edges with ten equivalent NiTm4Al2Ni6 cuboctahedra, faces with six equivalent AlTm3Ni9 cuboctahedra, and faces with sixteen NiTm3Al3Ni6 cuboctahedra. There are two shorter (2.48 Å) and two longer (2.54 Å) Ni–Ni bond lengths. Both Ni–Al bond lengths are 2.42 Å. Al is bonded to three equivalent Tm and nine Ni atoms to form distorted AlTm3Ni9 cuboctahedra that share corners with twenty-one NiTm3Al3Ni6 cuboctahedra, edges with six equivalent AlTm3Ni9 cuboctahedra, faces with two equivalent AlTm3Ni9 cuboctahedra, and faces with twenty-one NiTm3Al3Ni6 cuboctahedra.

36 MATERIALS SCIENCE↗