Materials Data on Ho6Ta4Al43 by Materials Project

Abstract

Ho6Ta4Al43 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. Ho is bonded in a 6-coordinate geometry to one Ho, one Ta, and fifteen Al atoms. The Ho–Ho bond length is 3.47 Å. The Ho–Ta bond length is 3.49 Å. There are a spread of Ho–Al bond distances ranging from 3.06–3.48 Å. There are two inequivalent Ta sites. In the first Ta site, Ta is bonded in a cuboctahedral geometry to twelve Al atoms. There are six shorter (2.70 Å) and six longer (2.90 Å) Ta–Al bond lengths. In the second Ta site, Ta is bonded in a 10-coordinate geometry to two equivalent Ho and ten Al atoms. There are a spread of Ta–Al bond distances ranging from 2.65–2.76 Å. There are seven inequivalent Al sites. In the first Al site, Al is bonded in a 12-coordinate geometry to one Ho, two Ta, and nine Al atoms. There are a spread of Al–Al bond distances ranging from 2.77–3.07 Å. In the second Al site, Al is bonded in a 12-coordinate geometry to two equivalent Ho, one Ta, and nine Al atoms. There are a spread of Al–Al bond distances ranging from 2.75–3.05 Å. In the third Al site, Al is bonded in a 12-coordinate geometry to four equivalent Ho and eight Al atoms. There are a spread of Al–Al bond distances ranging from 2.79–3.08 Å. In the fourth Al site, Al is bonded in a 12-coordinate geometry to two equivalent Ho, one Ta, and nine Al atoms. There are a spread of Al–Al bond distances ranging from 2.74–3.07 Å. In the fifth Al site, Al is bonded in a 10-coordinate geometry to two equivalent Ho, one Ta, and seven Al atoms. There are two shorter (2.83 Å) and one longer (2.88 Å) Al–Al bond lengths. In the sixth Al site, Al is bonded in a 12-coordinate geometry to two equivalent Ta and ten Al atoms. Both Al–Al bond lengths are 2.83 Å. In the seventh Al site, Al is bonded to three equivalent Ho and nine Al atoms to form a mixture of corner and face-sharing AlHo3Al9 cuboctahedra.