Materials Data on Sm6Al43W4 by Materials Project

Abstract

Sm6W4Al43 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. Sm is bonded in a 6-coordinate geometry to one Sm, one W, and fifteen Al atoms. The Sm–Sm bond length is 3.46 Å. The Sm–W bond length is 3.52 Å. There are a spread of Sm–Al bond distances ranging from 3.09–3.47 Å. There are two inequivalent W sites. In the first W site, W is bonded in a distorted q6 geometry to two equivalent Sm and ten Al atoms. There are a spread of W–Al bond distances ranging from 2.60–2.73 Å. In the second W site, W is bonded in a cuboctahedral geometry to twelve Al atoms. There are six shorter (2.70 Å) and six longer (2.85 Å) W–Al bond lengths. There are seven inequivalent Al sites. In the first Al site, Al is bonded in a distorted linear geometry to one Sm, two W, and three equivalent Al atoms. There are one shorter (2.80 Å) and two longer (2.87 Å) Al–Al bond lengths. In the second Al site, Al is bonded in a 12-coordinate geometry to four equivalent Sm and eight Al atoms. There are a spread of Al–Al bond distances ranging from 2.76–3.10 Å. In the third Al site, Al is bonded in a 1-coordinate geometry to two equivalent Sm, one W, and three Al atoms. There are one shorter (2.74 Å) and one longer (2.90 Å) Al–Al bond lengths. In the fourth Al site, Al is bonded in a distorted linear geometry to two equivalent W atoms. In the fifth Al site, Al is bonded in a 1-coordinate geometry to two equivalent Sm, one W, and nine Al atoms. Both Al–Al bond lengths are 3.01 Å. In the sixth Al site, Al is bonded to three equivalent Sm and nine Al atoms to form a mixture of corner and face-sharing AlSm3Al9 cuboctahedra. All Al–Al bond lengths are 2.84 Å. In the seventh Al site, Al is bonded in a 1-coordinate geometry to two equivalent Sm, one W, and two equivalent Al atoms.