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 1,531 records · Page 85
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on HfZrCo2 by Materials Project

HfZrCo2 crystallizes in the triclinic P1 space group. The structure is one-dimensional and consists of one HfZrCo2 ribbon oriented in the (1, 0, 0) direction. Hf is bonded in a linear geometry to two equivalent Co atoms. There are one shorter (2.24 Å) and one longer (2.25 Å) Hf–Co bond lengths. Zr is bonded in a linear geometry to two equivalent Co atoms. Both Zr–Co bond lengths are 2.21 Å. Co is bonded in a linear geometry to one Hf and one Zr atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf3Ti2Ga3 by Materials Project

Hf3Ti2Ga3 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. Hf is bonded in a 5-coordinate geometry to five equivalent Ga atoms. There are a spread of Hf–Ga bond distances ranging from 2.75–3.00 Å. Ti is bonded in a 6-coordinate geometry to six equivalent Ga atoms. All Ti–Ga bond lengths are 2.77 Å. Ga is bonded in a 9-coordinate geometry to five equivalent Hf and four equivalent Ti atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfTaOs2 by Materials Project

HfTaOs2 crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two HfTaOs2 ribbons oriented in the (1, 0, 0) direction. Hf is bonded in a linear geometry to two equivalent Os atoms. Both Hf–Os bond lengths are 2.43 Å. Ta is bonded in a linear geometry to two equivalent Os atoms. Both Ta–Os bond lengths are 2.30 Å. Os is bonded in a linear geometry to one Hf and one Ta atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfZrNb2 by Materials Project

HfZrNb2 crystallizes in the orthorhombic Cmm2 space group. The structure is two-dimensional and consists of one HfZrNb2 sheet oriented in the (0, 0, 1) direction. Hf is bonded in a 8-coordinate geometry to two equivalent Nb atoms. Both Hf–Nb bond lengths are 2.90 Å. Zr is bonded in a 8-coordinate geometry to four equivalent Nb atoms. There are two shorter (2.94 Å) and two longer (3.48 Å) Zr–Nb bond lengths. There are two inequivalent Nb sites. In the first Nb site, Nb is bonded in a 8-coordinate geometry to four equivalent Zr and ten Nb atoms. There are a spread of Nb–Nb bond distances ranging from 2.74–3.36 Å. In the second Nb site, Nb is bonded in a 8-coordinate geometry to two equivalent Hf and four equivalent Nb atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf3AlAu2 by Materials Project

Hf3Au2Al crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Hf is bonded in a 2-coordinate geometry to four equivalent Au atoms. There are two shorter (2.84 Å) and two longer (3.08 Å) Hf–Au bond lengths. Au is bonded in a 9-coordinate geometry to six equivalent Hf and three equivalent Al atoms. All Au–Al bond lengths are 2.71 Å. Al is bonded to six equivalent Au atoms to form distorted edge-sharing AlAu6 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfMg3 by Materials Project

Mg3Hf is Uranium Silicide structured and crystallizes in the cubic Pm-3m 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 twelve equivalent MgHf4Mg8 cuboctahedra, edges with eight equivalent HfMg12 cuboctahedra, edges with sixteen equivalent MgHf4Mg8 cuboctahedra, faces with four equivalent HfMg12 cuboctahedra, and faces with fourteen equivalent MgHf4Mg8 cuboctahedra. All Mg–Mg bond lengths are 3.13 Å. All Mg–Hf bond lengths are 3.13 Å. Hf is bonded to twelve equivalent Mg atoms to form HfMg12 cuboctahedra that share corners with twelve equivalent HfMg12 cuboctahedra, edges with twenty-four equivalent MgHf4Mg8 cuboctahedra, faces with six equivalent HfMg12 cuboctahedra, and faces with twelve equivalent MgHf4Mg8 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfMg6AlO8 by Materials Project

MgHfO2Mg5AlO6 crystallizes in the tetragonal P4/mmm space group. The structure is two-dimensional and consists of one Mg5AlO6 sheet oriented in the (0, 0, 1) direction and one MgHfO2 sheet oriented in the (0, 0, 1) direction. In the Mg5AlO6 sheet, there are two inequivalent Mg sites. In the first Mg site, Mg is bonded to six O atoms to form MgO6 octahedra that share corners with four equivalent MgO6 octahedra, edges with four equivalent AlO6 octahedra, and edges with eight equivalent MgO5 square pyramids. The corner-sharing octahedral tilt angles are 0°. There are four shorter (2.09 Å) and two longer (2.28 Å) Mg–O bond lengths. In the second Mg site, Mg is bonded to five O atoms to form distorted MgO5 square pyramids that share corners with five equivalent MgO5 square pyramids, edges with two equivalent MgO6 octahedra, edges with two equivalent AlO6 octahedra, and edges with four equivalent MgO5 square pyramids. There are a spread of Mg–O bond distances ranging from 2.09–2.29 Å. Al is bonded to six O atoms to form AlO6 octahedra that share corners with four equivalent AlO6 octahedra, edges with four equivalent MgO6 octahedra, and edges with eight equivalent MgO5 square pyramids. The corner-sharing octahedral tilt angles are 0°. There is two shorter (1.83 Å) and four longer (2.09 Å) Al–O bond length. There are three inequivalent O sites. In the first O site, O is bonded to four equivalent Mg and one Al atom to form distorted OMg4Al square pyramids that share corners with five equivalent OMg4Al square pyramids, edges with four equivalent OMg4Al2 octahedra, and edges with four equivalent OMg5 square pyramids. In the second O site, O is bonded to five Mg atoms to form OMg5 square pyramids that share corners with five equivalent OMg5 square pyramids, edges with four equivalent OMg4Al2 octahedra, and edges with four equivalent OMg4Al square pyramids. In the third O site, O is bonded to four Mg and two equivalent Al atoms to form OMg4Al2 octahedra that share corners with four equivalent OMg4Al2 octahedra, edges with four equivalent OMg4Al2 octahedra, and edges with eight OMg4Al square pyramids. The corner-sharing octahedral tilt angles are 0°. In the MgHfO2 sheet, Mg is bonded in a square co-planar geometry to four equivalent O atoms. All Mg–O bond lengths are 2.09 Å. Hf is bonded in a square co-planar geometry to four equivalent O atoms. All Hf–O bond lengths are 2.09 Å. O is bonded in a square co-planar geometry to two equivalent Mg and two equivalent Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfInPt2 by Materials Project

HfPt2In is alpha iridium vanadium-derived structured and crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Hf is bonded in a body-centered cubic geometry to eight equivalent Pt atoms. All Hf–Pt bond lengths are 2.81 Å. Pt is bonded in a distorted body-centered cubic geometry to four equivalent Hf and four equivalent In atoms. All Pt–In bond lengths are 3.00 Å. In is bonded in a distorted body-centered cubic geometry to eight equivalent Pt atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfVP by Materials Project

HfVP crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Hf is bonded in a 5-coordinate geometry to five equivalent P atoms. There are a spread of Hf–P bond distances ranging from 2.64–2.81 Å. V is bonded in a 4-coordinate geometry to four equivalent P atoms. There are a spread of V–P bond distances ranging from 2.43–2.54 Å. P is bonded in a 9-coordinate geometry to five equivalent Hf and four equivalent V atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ErHfIr2 by Materials Project

ErHfIr2 is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Er is bonded in a body-centered cubic geometry to eight equivalent Ir atoms. All Er–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 Er and four equivalent Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfAlPt2 by Materials Project

HfPt2Al 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 Pt atoms. All Hf–Pt bond lengths are 2.80 Å. Pt is bonded in a body-centered cubic geometry to four equivalent Hf and four equivalent Al atoms. All Pt–Al bond lengths are 2.80 Å. Al is bonded in a body-centered cubic geometry to eight equivalent Pt atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf3Pt by Materials Project

Hf3Pt 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 Pt atoms. All Hf–Pt bond lengths are 3.04 Å. Pt is bonded to twelve equivalent Hf atoms to form a mixture of corner and face-sharing PtHf12 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfCuRh2 by Materials Project

HfRh2Cu crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two HfRh2Cu ribbons oriented in the (1, 0, 0) direction. Hf is bonded in a linear geometry to two equivalent Rh atoms. Both Hf–Rh bond lengths are 2.20 Å. Rh is bonded in a linear geometry to one Hf and one Cu atom. The Rh–Cu bond length is 2.45 Å. Cu is bonded in a linear geometry to two equivalent Rh atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfMo by Materials Project

HfMo crystallizes in the orthorhombic Cmmm space group. The structure is two-dimensional and consists of two HfMo sheets oriented in the (0, 1, 0) direction. Hf is bonded in a 4-coordinate geometry to four equivalent Mo atoms. All Hf–Mo bond lengths are 2.78 Å. Mo is bonded in a 4-coordinate geometry to four equivalent Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfScPd2 by Materials Project

ScHfPd2 crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two ScHfPd2 ribbons oriented in the (1, 0, 0) direction. Sc is bonded in a linear geometry to two equivalent Pd atoms. Both Sc–Pd bond lengths are 2.58 Å. Hf is bonded in a linear geometry to two equivalent Pd atoms. Both Hf–Pd bond lengths are 2.39 Å. Pd is bonded in a linear geometry to one Sc and one Hf atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfZrRu2 by Materials Project

HfZrRu2 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 Ru atoms. All Hf–Ru bond lengths are 2.83 Å. Zr is bonded in a body-centered cubic geometry to eight equivalent Ru atoms. All Zr–Ru bond lengths are 2.83 Å. Ru 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 HfPd2 by Materials Project

HfPd2 is Titanium Disilicide-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Hf is bonded in a distorted q6 geometry to ten equivalent Pd atoms. There are eight shorter (2.81 Å) and two longer (2.96 Å) Hf–Pd bond lengths. Pd is bonded in a 10-coordinate geometry to five equivalent Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfMg6BO7 by Materials Project

Mg6HfBO7 crystallizes in the tetragonal P4mm space group. The structure is two-dimensional and consists of one Mg6HfBO7 sheet oriented in the (0, 0, 1) direction. there are four inequivalent Mg sites. In the first Mg site, Mg is bonded to six O atoms to form distorted MgO6 octahedra that share corners with four equivalent MgO6 octahedra, corners with four equivalent MgO5 trigonal bipyramids, and edges with four equivalent MgO5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 21°. There are a spread of Mg–O bond distances ranging from 1.99–2.31 Å. In the second Mg site, Mg is bonded to five O atoms to form distorted MgO5 trigonal bipyramids that share corners with eight MgO5 trigonal bipyramids and edges with four equivalent MgO6 octahedra. There are one shorter (2.04 Å) and four longer (2.10 Å) Mg–O bond lengths. In the third Mg site, Mg is bonded in a T-shaped geometry to three O atoms. There are one shorter (2.03 Å) and two longer (2.04 Å) Mg–O bond lengths. In the fourth Mg site, Mg is bonded to five O atoms to form distorted MgO5 trigonal bipyramids that share corners with two equivalent MgO6 octahedra, corners with six MgO5 trigonal bipyramids, and edges with four equivalent MgO5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 75°. There are a spread of Mg–O bond distances ranging from 2.00–2.11 Å. Hf is bonded in a 4-coordinate geometry to four equivalent O atoms. All Hf–O bond lengths are 2.13 Å. B is bonded in a single-bond geometry to one O atom. The B–O bond length is 1.46 Å. There are five inequivalent O sites. In the first O site, O is bonded to five Mg and one B atom to form distorted OMg5B octahedra that share corners with four equivalent OMg5B octahedra, a cornercorner with one OMg5 trigonal bipyramid, and edges with four equivalent OMg5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 6°. In the second O site, O is bonded to five Mg atoms to form distorted OMg5 trigonal bipyramids that share a cornercorner with one OMg5B octahedra, corners with eight OMg5 trigonal bipyramids, and edges with four equivalent OMg5 square pyramids. The corner-sharing octahedral tilt angles are 0°. In the third O site, O is bonded to five Mg atoms to form a mixture of distorted edge and corner-sharing OMg5 square pyramids. In the fourth O site, O is bonded in a distorted trigonal non-coplanar geometry to one Mg and two equivalent Hf atoms. In the fifth O site, O is bonded to five Mg atoms to form distorted OMg5 trigonal bipyramids that share corners with two equivalent OMg5 square pyramids, corners with six OMg5 trigonal bipyramids, edges with two equivalent OMg5B octahedra, and edges with four equivalent OMg5 trigonal bipyramids.

36 MATERIALS SCIENCE↗