Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “HF”

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.

At least 1,387 records · Page 77
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on LiHfRh2 by Materials Project

LiHfRh2 is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Li is bonded in a body-centered cubic geometry to eight equivalent Rh atoms. All Li–Rh bond lengths are 2.70 Å. Hf is bonded in a body-centered cubic geometry to eight equivalent Rh atoms. All Hf–Rh bond lengths are 2.70 Å. Rh is bonded in a body-centered cubic geometry to four equivalent Li and four equivalent Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LiHfPt2 by Materials Project

LiHfPt2 is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Li is bonded in a body-centered cubic geometry to eight equivalent Pt atoms. All Li–Pt bond lengths are 2.77 Å. Hf is bonded in a body-centered cubic geometry to eight equivalent Pt atoms. All Hf–Pt bond lengths are 2.77 Å. Pt is bonded in a body-centered cubic geometry to four equivalent Li and four equivalent Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on La3Hf by Materials Project

La3Hf is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. La is bonded to eight equivalent La and four equivalent Hf atoms to form LaLa8Hf4 cuboctahedra that share corners with twelve equivalent LaLa8Hf4 cuboctahedra, edges with eight equivalent HfLa12 cuboctahedra, edges with sixteen equivalent LaLa8Hf4 cuboctahedra, faces with four equivalent HfLa12 cuboctahedra, and faces with fourteen equivalent LaLa8Hf4 cuboctahedra. All La–La bond lengths are 3.57 Å. All La–Hf bond lengths are 3.57 Å. Hf is bonded to twelve equivalent La atoms to form HfLa12 cuboctahedra that share corners with twelve equivalent HfLa12 cuboctahedra, edges with twenty-four equivalent LaLa8Hf4 cuboctahedra, faces with six equivalent HfLa12 cuboctahedra, and faces with twelve equivalent LaLa8Hf4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf3Pt by Materials Project

Hf3Pt is Uranium Silicide-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Hf is bonded in a distorted see-saw-like geometry to four equivalent Pt atoms. There are two shorter (2.99 Å) and two longer (3.07 Å) Hf–Pt bond lengths. Pt is bonded to twelve equivalent Hf atoms to form a mixture of face and corner-sharing PtHf12 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K4Hf5O12 by Materials Project

K4Hf5O12 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are three shorter (2.69 Å) and six longer (2.97 Å) K–O bond lengths. In the second K1+ site, K1+ is bonded to twelve O2- atoms to form KO12 cuboctahedra that share corners with six equivalent KO12 cuboctahedra, faces with three equivalent KO12 cuboctahedra, and faces with seven HfO6 octahedra. There are a spread of K–O bond distances ranging from 2.91–3.27 Å. There are three inequivalent Hf4+ sites. In the first Hf4+ site, Hf4+ is bonded in a 6-coordinate geometry to six equivalent O2- atoms. There are three shorter (2.05 Å) and three longer (2.20 Å) Hf–O bond lengths. In the second Hf4+ site, Hf4+ is bonded to six equivalent O2- atoms to form HfO6 octahedra that share corners with six equivalent HfO6 octahedra and faces with six equivalent KO12 cuboctahedra. The corner-sharing octahedral tilt angles are 7°. All Hf–O bond lengths are 2.09 Å. In the third Hf4+ site, Hf4+ is bonded to six O2- atoms to form distorted HfO6 octahedra that share corners with three equivalent HfO6 octahedra and faces with four equivalent KO12 cuboctahedra. The corner-sharing octahedral tilt angles are 7°. There are three shorter (1.97 Å) and three longer (2.31 Å) Hf–O bond lengths. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to four K1+ and two Hf4+ atoms. In the second O2- site, O2- is bonded in a 3-coordinate geometry to three K1+ and three Hf4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfZrZn2 by Materials Project

HfZrZn2 is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Hf is bonded in a body-centered cubic geometry to eight equivalent Zn atoms. All Hf–Zn bond lengths are 2.88 Å. Zr is bonded in a body-centered cubic geometry to eight equivalent Zn atoms. All Zr–Zn bond lengths are 2.88 Å. Zn is bonded in a body-centered cubic geometry to four equivalent Hf and four equivalent Zr atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pr3Hf by Materials Project

Pr3Hf is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Pr is bonded to eight equivalent Pr and four equivalent Hf atoms to form PrPr8Hf4 cuboctahedra that share corners with twelve equivalent PrPr8Hf4 cuboctahedra, edges with eight equivalent HfPr12 cuboctahedra, edges with sixteen equivalent PrPr8Hf4 cuboctahedra, faces with four equivalent HfPr12 cuboctahedra, and faces with fourteen equivalent PrPr8Hf4 cuboctahedra. All Pr–Pr bond lengths are 3.56 Å. All Pr–Hf bond lengths are 3.56 Å. Hf is bonded to twelve equivalent Pr atoms to form HfPr12 cuboctahedra that share corners with twelve equivalent HfPr12 cuboctahedra, edges with twenty-four equivalent PrPr8Hf4 cuboctahedra, faces with six equivalent HfPr12 cuboctahedra, and faces with twelve equivalent PrPr8Hf4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfRu3 by Materials Project

HfRu3 is Uranium Silicide-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Hf is bonded to twelve equivalent Ru atoms to form a mixture of face and corner-sharing HfRu12 cuboctahedra. There are six shorter (2.78 Å) and six longer (2.83 Å) Hf–Ru bond lengths. Ru is bonded in a distorted see-saw-like geometry to four equivalent Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf3Au by Materials Project

Hf3Au is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Hf is bonded in a distorted square co-planar geometry to four equivalent Au atoms. All Hf–Au bond lengths are 3.08 Å. Au is bonded to twelve equivalent Hf atoms to form a mixture of face and corner-sharing AuHf12 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfH3 by Materials Project

HfH3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Hf is bonded to twelve equivalent H atoms to form a mixture of corner and face-sharing HfH12 cuboctahedra. All Hf–H bond lengths are 2.18 Å. H is bonded in a square co-planar geometry to four equivalent Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm3Hf by Materials Project

Sm3Hf is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Sm is bonded to eight equivalent Sm and four equivalent Hf atoms to form SmSm8Hf4 cuboctahedra that share corners with twelve equivalent SmSm8Hf4 cuboctahedra, edges with eight equivalent HfSm12 cuboctahedra, edges with sixteen equivalent SmSm8Hf4 cuboctahedra, faces with four equivalent HfSm12 cuboctahedra, and faces with fourteen equivalent SmSm8Hf4 cuboctahedra. All Sm–Sm bond lengths are 3.50 Å. All Sm–Hf bond lengths are 3.50 Å. Hf is bonded to twelve equivalent Sm atoms to form HfSm12 cuboctahedra that share corners with twelve equivalent HfSm12 cuboctahedra, edges with twenty-four equivalent SmSm8Hf4 cuboctahedra, faces with six equivalent HfSm12 cuboctahedra, and faces with twelve equivalent SmSm8Hf4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TmHfIr2 by Materials Project

TmHfIr2 is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Tm is bonded in a body-centered cubic geometry to eight equivalent Ir atoms. All Tm–Ir bond lengths are 2.89 Å. Hf is bonded in a body-centered cubic geometry to eight equivalent Ir atoms. All Hf–Ir bond lengths are 2.89 Å. Ir is bonded in a body-centered cubic geometry to four equivalent Tm and four equivalent Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfMg3 by Materials Project

Mg3Hf is Magnesium-derived structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Mg is bonded to eight equivalent Mg and four equivalent Hf atoms to form MgHf4Mg8 cuboctahedra that share corners with four equivalent HfMg12 cuboctahedra, corners with fourteen equivalent MgHf4Mg8 cuboctahedra, edges with six equivalent HfMg12 cuboctahedra, edges with twelve equivalent MgHf4Mg8 cuboctahedra, faces with four equivalent HfMg12 cuboctahedra, and faces with sixteen equivalent MgHf4Mg8 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.11–3.18 Å. There are two shorter (3.10 Å) and two longer (3.16 Å) Mg–Hf bond lengths. Hf is bonded to twelve equivalent Mg atoms to form HfMg12 cuboctahedra that share corners with six equivalent HfMg12 cuboctahedra, corners with twelve equivalent MgHf4Mg8 cuboctahedra, edges with eighteen equivalent MgHf4Mg8 cuboctahedra, faces with eight equivalent HfMg12 cuboctahedra, and faces with twelve equivalent MgHf4Mg8 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HoHfOs2 by Materials Project

HoHfOs2 is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Ho is bonded in a body-centered cubic geometry to eight equivalent Os atoms. All Ho–Os bond lengths are 2.88 Å. Hf is bonded in a body-centered cubic geometry to eight equivalent Os atoms. All Hf–Os bond lengths are 2.88 Å. Os is bonded in a body-centered cubic geometry to four equivalent Ho and four equivalent Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TmHfCo2 by Materials Project

TmHfCo2 is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Tm is bonded in a body-centered cubic geometry to eight equivalent Co atoms. All Tm–Co bond lengths are 2.79 Å. Hf is bonded in a body-centered cubic geometry to eight equivalent Co atoms. All Hf–Co bond lengths are 2.79 Å. Co is bonded in a body-centered cubic geometry to four equivalent Tm and four equivalent Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfAlIr2 by Materials Project

HfIr2Al is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Hf is bonded in a body-centered cubic geometry to eight equivalent Ir atoms. All Hf–Ir bond lengths are 2.75 Å. Ir is bonded in a body-centered cubic geometry to four equivalent Hf and four equivalent Al atoms. All Ir–Al bond lengths are 2.75 Å. Al is bonded in a body-centered cubic geometry to eight equivalent Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfMgAu2 by Materials Project

MgHfAu2 is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Mg is bonded in a body-centered cubic geometry to eight equivalent Au atoms. All Mg–Au bond lengths are 2.90 Å. Hf is bonded in a body-centered cubic geometry to eight equivalent Au atoms. All Hf–Au bond lengths are 2.90 Å. Au is bonded in a body-centered cubic geometry to four equivalent Mg and four equivalent Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfAlFe2 by Materials Project

HfFe2Al is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Hf is bonded in a body-centered cubic geometry to eight equivalent Fe atoms. All Hf–Fe bond lengths are 2.61 Å. Fe is bonded in a body-centered cubic geometry to four equivalent Hf and four equivalent Al atoms. All Fe–Al bond lengths are 2.61 Å. Al is bonded in a distorted body-centered cubic geometry to eight equivalent Fe atoms.

36 MATERIALS SCIENCE↗