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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Hf2Be17 by Materials Project

Be17Hf2 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are four inequivalent Be sites. In the first Be site, Be is bonded in a 2-coordinate geometry to thirteen Be and one Hf atom. There are a spread of Be–Be bond distances ranging from 2.11–2.40 Å. The Be–Hf bond length is 2.64 Å. In the second Be site, Be is bonded to ten Be and two equivalent Hf atoms to form distorted BeHf2Be10 cuboctahedra that share corners with twenty-two BeHf2Be10 cuboctahedra, edges with ten BeHf3Be9 cuboctahedra, and faces with eighteen BeHf2Be10 cuboctahedra. There are four shorter (2.14 Å) and four longer (2.17 Å) Be–Be bond lengths. Both Be–Hf bond lengths are 2.85 Å. In the third Be site, Be is bonded to ten Be and two equivalent Hf atoms to form distorted BeHf2Be10 cuboctahedra that share corners with twenty-four BeHf2Be10 cuboctahedra, edges with five BeHf3Be9 cuboctahedra, and faces with twenty-one BeHf2Be10 cuboctahedra. There are a spread of Be–Be bond distances ranging from 2.16–2.34 Å. Both Be–Hf bond lengths are 2.67 Å. In the fourth Be site, Be is bonded to nine Be and three equivalent Hf atoms to form a mixture of corner, edge, and face-sharing BeHf3Be9 cuboctahedra. Both Be–Be bond lengths are 2.15 Å. There are a spread of Be–Hf bond distances ranging from 2.72–2.84 Å. Hf is bonded in a 10-coordinate geometry to nineteen Be atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf2Be17 by Materials Project

Be17Hf2 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are ten inequivalent Be sites. In the first Be site, Be is bonded in a 2-coordinate geometry to thirteen Be and one Hf atom. There are a spread of Be–Be bond distances ranging from 2.11–2.40 Å. The Be–Hf bond length is 2.63 Å. In the second Be site, Be is bonded to ten Be and two Hf atoms to form a mixture of distorted corner, edge, and face-sharing BeHf2Be10 cuboctahedra. There are a spread of Be–Be bond distances ranging from 2.14–2.34 Å. There are one shorter (2.67 Å) and one longer (2.68 Å) Be–Hf bond lengths. In the third Be site, Be is bonded to nine Be and three Hf atoms to form a mixture of distorted corner, edge, and face-sharing BeHf3Be9 cuboctahedra. There are a spread of Be–Be bond distances ranging from 2.15–2.34 Å. There are a spread of Be–Hf bond distances ranging from 2.72–2.87 Å. In the fourth Be site, Be is bonded to nine Be and three Hf atoms to form a mixture of corner, edge, and face-sharing BeHf3Be9 cuboctahedra. There are a spread of Be–Be bond distances ranging from 2.15–2.34 Å. There are a spread of Be–Hf bond distances ranging from 2.71–2.83 Å. In the fifth Be site, Be is bonded to ten Be and two equivalent Hf atoms to form a mixture of distorted corner, edge, and face-sharing BeHf2Be10 cuboctahedra. There are four shorter (2.13 Å) and two longer (2.29 Å) Be–Be bond lengths. Both Be–Hf bond lengths are 2.85 Å. In the sixth Be site, Be is bonded in a 2-coordinate geometry to thirteen Be and one Hf atom. There are one shorter (2.10 Å) and six longer (2.40 Å) Be–Be bond lengths. The Be–Hf bond length is 2.63 Å. In the seventh Be site, Be is bonded to ten Be and two Hf atoms to form a mixture of distorted corner, edge, and face-sharing BeHf2Be10 cuboctahedra. There are a spread of Be–Be bond distances ranging from 2.13–2.29 Å. There are one shorter (2.82 Å) and one longer (2.85 Å) Be–Hf bond lengths. In the eighth Be site, Be is bonded to nine Be and three Hf atoms to form a mixture of distorted corner, edge, and face-sharing BeHf3Be9 cuboctahedra. There are two shorter (2.22 Å) and one longer (2.35 Å) Be–Be bond lengths. There are a spread of Be–Hf bond distances ranging from 2.74–2.83 Å. In the ninth Be site, Be is bonded in a 2-coordinate geometry to thirteen Be and one Hf atom. All Be–Be bond lengths are 2.40 Å. The Be–Hf bond length is 2.58 Å. In the tenth Be site, Be is bonded to ten Be and two Hf atoms to form a mixture of distorted corner, edge, and face-sharing BeHf2Be10 cuboctahedra. Both Be–Be bond lengths are 2.16 Å. Both Be–Hf bond lengths are 2.68 Å. There are four inequivalent Hf sites. In the first Hf site, Hf is bonded in a 1-coordinate geometry to nineteen Be atoms. In the second Hf site, Hf is bonded in a 8-coordinate geometry to twenty Be atoms. In the third Hf site, Hf is bonded in a 10-coordinate geometry to nineteen Be atoms. In the fourth Hf site, Hf is bonded in a 12-coordinate geometry to eighteen Be atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf2Be17 by Materials Project

Be17Hf2 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are four inequivalent Be sites. In the first Be site, Be is bonded in a 2-coordinate geometry to thirteen Be and one Hf atom. There are a spread of Be–Be bond distances ranging from 2.09–2.39 Å. The Be–Hf bond length is 2.59 Å. In the second Be site, Be is bonded to ten Be and two equivalent Hf atoms to form BeHf2Be10 cuboctahedra that share corners with twenty-two BeHf2Be10 cuboctahedra, edges with ten BeHf3Be9 cuboctahedra, and faces with eighteen BeHf2Be10 cuboctahedra. There are four shorter (2.14 Å) and four longer (2.17 Å) Be–Be bond lengths. Both Be–Hf bond lengths are 2.82 Å. In the third Be site, Be is bonded to ten Be and two Hf atoms to form a mixture of distorted face, edge, and corner-sharing BeHf2Be10 cuboctahedra. There are a spread of Be–Be bond distances ranging from 2.13–2.34 Å. There are one shorter (2.67 Å) and one longer (2.69 Å) Be–Hf bond lengths. In the fourth Be site, Be is bonded to nine Be and three Hf atoms to form a mixture of distorted face, edge, and corner-sharing BeHf3Be9 cuboctahedra. Both Be–Be bond lengths are 2.14 Å. There are a spread of Be–Hf bond distances ranging from 2.74–2.87 Å. There are two inequivalent Hf sites. In the first Hf site, Hf is bonded in a 12-coordinate geometry to eighteen Be atoms. In the second Hf site, Hf is bonded in a 8-coordinate geometry to twenty Be atoms.

36 MATERIALS SCIENCE↗