Search NASA⌕ Search

SEARCH · Search NASA

Results for “Hf-Mn”

Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

3 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on HfMn2 by Materials Project

HfMn2 is Hexagonal Laves structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Hf is bonded in a 12-coordinate geometry to four equivalent Hf and twelve Mn atoms. There are three shorter (3.01 Å) and one longer (3.04 Å) Hf–Hf bond lengths. There are a spread of Hf–Mn bond distances ranging from 2.87–2.91 Å. There are two inequivalent Mn sites. In the first Mn site, Mn is bonded to six equivalent Hf and six equivalent Mn atoms to form a mixture of corner, edge, and face-sharing MnHf6Mn6 cuboctahedra. All Mn–Mn bond lengths are 2.50 Å. In the second Mn site, Mn is bonded to six equivalent Hf and six Mn atoms to form a mixture of corner, edge, and face-sharing MnHf6Mn6 cuboctahedra. There are two shorter (2.39 Å) and two longer (2.51 Å) Mn–Mn bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfMn2 by Materials Project

HfMn2 is Hexagonal Laves-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are five inequivalent Hf sites. In the first Hf site, Hf is bonded in a 12-coordinate geometry to four Hf and twelve Mn atoms. There are one shorter (3.02 Å) and three longer (3.03 Å) Hf–Hf bond lengths. There are three shorter (2.89 Å) and nine longer (2.90 Å) Hf–Mn bond lengths. In the second Hf site, Hf is bonded in a 12-coordinate geometry to four Hf and twelve Mn atoms. All Hf–Hf bond lengths are 3.03 Å. There are three shorter (2.89 Å) and nine longer (2.90 Å) Hf–Mn bond lengths. In the third Hf site, Hf is bonded in a 12-coordinate geometry to four Hf and twelve Mn atoms. There are one shorter (3.02 Å) and three longer (3.03 Å) Hf–Hf bond lengths. There are three shorter (2.89 Å) and nine longer (2.90 Å) Hf–Mn bond lengths. In the fourth Hf site, Hf is bonded in a 12-coordinate geometry to four Hf and twelve Mn atoms. The Hf–Hf bond length is 3.04 Å. There are three shorter (2.89 Å) and nine longer (2.90 Å) Hf–Mn bond lengths. In the fifth Hf site, Hf is bonded in a 12-coordinate geometry to four Hf and twelve Mn atoms. There are three shorter (2.89 Å) and nine longer (2.90 Å) Hf–Mn bond lengths. There are three inequivalent Mn sites. In the first Mn site, Mn is bonded to six Hf and six Mn atoms to form a mixture of corner, edge, and face-sharing MnHf6Mn6 cuboctahedra. There are three shorter (2.47 Å) and three longer (2.49 Å) Mn–Mn bond lengths. In the second Mn site, Mn is bonded to six Hf and six Mn atoms to form a mixture of corner, edge, and face-sharing MnHf6Mn6 cuboctahedra. All Mn–Mn bond lengths are 2.47 Å. In the third Mn site, Mn is bonded to six Hf and six Mn atoms to form a mixture of corner, edge, and face-sharing MnHf6Mn6 cuboctahedra. There are two shorter (2.43 Å) and two longer (2.52 Å) Mn–Mn bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfMn by Materials Project

HfMn crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Hf is bonded in a 6-coordinate geometry to eight equivalent Hf and six Mn atoms. There are four shorter (3.03 Å) and four longer (3.25 Å) Hf–Hf bond lengths. There are two shorter (2.86 Å) and four longer (2.91 Å) Hf–Mn bond lengths. There are two inequivalent Mn sites. In the first Mn site, Mn is bonded to six equivalent Hf and six equivalent Mn atoms to form a mixture of face and corner-sharing MnHf6Mn6 cuboctahedra. All Mn–Mn bond lengths are 2.48 Å. In the second Mn site, Mn is bonded to six equivalent Hf and six Mn atoms to form a mixture of distorted face and corner-sharing MnHf6Mn6 cuboctahedra. All Mn–Mn bond lengths are 2.54 Å.

36 MATERIALS SCIENCE↗