Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “Ho”

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 667 records · Page 37
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ho5Ge3C by Materials Project

Ho5Ge3C crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded in a 6-coordinate geometry to six equivalent Ge atoms. All Ho–Ge bond lengths are 3.04 Å. In the second Ho site, Ho is bonded in a 2-coordinate geometry to five equivalent Ge and two equivalent C atoms. There are a spread of Ho–Ge bond distances ranging from 2.99–3.58 Å. Both Ho–C bond lengths are 2.47 Å. Ge is bonded in a 9-coordinate geometry to nine Ho atoms. C is bonded to six equivalent Ho atoms to form face-sharing CHo6 octahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho2Si3Pd by Materials Project

Ho2PdSi3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded to four equivalent Pd and eight equivalent Si atoms to form a mixture of distorted edge and face-sharing HoSi8Pd4 cuboctahedra. There are two shorter (3.01 Å) and two longer (3.18 Å) Ho–Pd bond lengths. There are four shorter (3.03 Å) and four longer (3.13 Å) Ho–Si bond lengths. In the second Ho site, Ho is bonded to twelve equivalent Si atoms to form a mixture of edge and face-sharing HoSi12 cuboctahedra. There are six shorter (3.04 Å) and six longer (3.08 Å) Ho–Si bond lengths. Pd is bonded in a 3-coordinate geometry to six equivalent Ho and three equivalent Si atoms. All Pd–Si bond lengths are 2.41 Å. Si is bonded in a 1-coordinate geometry to six Ho, one Pd, and two equivalent Si atoms. Both Si–Si bond lengths are 2.35 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho3In5 by Materials Project

Ho3In5 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded in a 9-coordinate geometry to nine In atoms. There are a spread of Ho–In bond distances ranging from 3.09–3.47 Å. In the second Ho site, Ho is bonded in a 10-coordinate geometry to ten In atoms. There are a spread of Ho–In bond distances ranging from 3.19–3.49 Å. There are three inequivalent In sites. In the first In site, In is bonded in a 5-coordinate geometry to five Ho and six In atoms. There are a spread of In–In bond distances ranging from 3.14–3.31 Å. In the second In site, In is bonded in a 6-coordinate geometry to six Ho and four In atoms. There are two shorter (3.04 Å) and one longer (3.22 Å) In–In bond lengths. In the third In site, In is bonded in a 10-coordinate geometry to six Ho and four In atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho5CuPb3 by Materials Project

Ho5CuPb3 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded in a 7-coordinate geometry to two equivalent Cu and five equivalent Pb atoms. Both Ho–Cu bond lengths are 2.84 Å. There are a spread of Ho–Pb bond distances ranging from 3.16–3.61 Å. In the second Ho site, Ho is bonded in a 6-coordinate geometry to six equivalent Pb atoms. All Ho–Pb bond lengths are 3.27 Å. Cu is bonded to six equivalent Ho atoms to form face-sharing CuHo6 octahedra. Pb is bonded in a 9-coordinate geometry to nine Ho atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HoZnGe by Materials Project

HoZnGe crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded in a 12-coordinate geometry to six equivalent Zn and six equivalent Ge atoms. All Ho–Zn bond lengths are 2.92 Å. All Ho–Ge bond lengths are 3.25 Å. In the second Ho site, Ho is bonded to six equivalent Ge atoms to form distorted edge-sharing HoGe6 octahedra. All Ho–Ge bond lengths are 2.99 Å. Zn is bonded in a 3-coordinate geometry to three equivalent Ho and three equivalent Ge atoms. All Zn–Ge bond lengths are 2.50 Å. Ge is bonded in a 6-coordinate geometry to six Ho and three equivalent Zn atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HoIn7Cu5 by Materials Project

HoCu5In7 crystallizes in the orthorhombic Imm2 space group. The structure is three-dimensional. Ho is bonded in a 8-coordinate geometry to ten Cu and ten In atoms. There are a spread of Ho–Cu bond distances ranging from 3.54–3.66 Å. There are a spread of Ho–In bond distances ranging from 3.14–3.55 Å. There are two inequivalent Cu sites. In the first Cu site, Cu is bonded in a 12-coordinate geometry to two equivalent Ho, three Cu, and seven In atoms. There are a spread of Cu–Cu bond distances ranging from 2.71–2.86 Å. There are a spread of Cu–In bond distances ranging from 2.70–2.97 Å. In the second Cu site, Cu is bonded in a 12-coordinate geometry to two equivalent Ho, four equivalent Cu, and six In atoms. There are a spread of Cu–In bond distances ranging from 2.75–2.98 Å. There are five inequivalent In sites. In the first In site, In is bonded in a 10-coordinate geometry to one Ho, four equivalent Cu, and five In atoms. There are a spread of In–In bond distances ranging from 3.01–3.17 Å. In the second In site, In is bonded in a 8-coordinate geometry to one Ho, six Cu, and three In atoms. Both In–In bond lengths are 3.32 Å. In the third In site, In is bonded in a 10-coordinate geometry to one Ho, five Cu, and four In atoms. There are a spread of In–In bond distances ranging from 3.04–3.12 Å. In the fourth In site, In is bonded to two equivalent Ho, four equivalent Cu, and six In atoms to form distorted edge-sharing InHo2In6Cu4 cuboctahedra. Both In–In bond lengths are 2.93 Å. In the fifth In site, In is bonded in a 12-coordinate geometry to two equivalent Ho, five Cu, and five In atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2024

The Role and Lifetime of Dissociative Heterogeneous Processes in Improving Simulated Ozone on Mars

Abstract Ozone simulated in Mars Global Climate Models (MGCMs) is used to assess the underlying chemistry occurring in the atmosphere. Currently, ozone total column abundance (TCA) is under‐predicted in MGCMs by up to 120%, implying missing or inaccurate chemistry in models. Heterogeneous reactions of hydroxyl radicals (HO X ) have been offered as an explanation for some of this bias, because they cause ozone to increase at locations where it's currently under‐predicted. We use four simulations to compare modeled ozone TCA with observations from the UVIS spectrometer aboard the ExoMars Trace Gas Orbiter to improve the representation of heterogeneous processes and their impact on ozone. We use a gas‐phase only run, a dissociative scheme, an adsorbed HO X retention scheme, and a hybrid scheme that combines the dissociative mechanism with the retention of HO X on water ice. We find retention of HO X is dependent on water ice sublimation, and ozone abundance increases when water ice persists for longer periods (1–20 sols). Over time, the loss of HO X causes a depletion in H 2 O 2 concentration (HO X reservoir), and thus allows ozone concentration to increase. When adsorbed HO X are desorbed and dissociate into other by‐products, HO X are not immediately available to destroy ozone. This results in larger ozone concentrations than if desorbed HO X are released directly back into their gaseous states. When using the hybrid scheme, ozone TCA is increased up to 50% where the ozone deficit is greatest, demonstrating the best agreement with observations, and implying that HO X radicals are both retained when adsorbed and dissociate.

Brown, M. A. J.↗
DOE OSTI2020

Materials Data on Ho2Ge5Rh3 by Materials Project

Ho2Rh3Ge5 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Ho is bonded in a 8-coordinate geometry to six Rh and ten Ge atoms. There are a spread of Ho–Rh bond distances ranging from 3.17–3.58 Å. There are a spread of Ho–Ge bond distances ranging from 3.04–3.40 Å. There are two inequivalent Rh sites. In the first Rh site, Rh is bonded in a 9-coordinate geometry to four equivalent Ho and five Ge atoms. There are a spread of Rh–Ge bond distances ranging from 2.41–2.57 Å. In the second Rh site, Rh is bonded in a 6-coordinate geometry to four equivalent Ho and six Ge atoms. There are a spread of Rh–Ge bond distances ranging from 2.50–2.75 Å. There are four inequivalent Ge sites. In the first Ge site, Ge is bonded in a 4-coordinate geometry to four equivalent Ho and four equivalent Rh atoms. In the second Ge site, Ge is bonded in a 5-coordinate geometry to four equivalent Ho, three Rh, and four Ge atoms. There are two shorter (2.69 Å) and two longer (2.95 Å) Ge–Ge bond lengths. In the third Ge site, Ge is bonded in a 2-coordinate geometry to four equivalent Ho, three Rh, and four Ge atoms. Both Ge–Ge bond lengths are 2.69 Å. In the fourth Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent Ho, three Rh, and two Ge atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HoSi3Rh5 by Materials Project

HoRh5Si3 crystallizes in the hexagonal P6_3/m space group. The structure is three-dimensional. Ho is bonded in a 12-coordinate geometry to six Rh and six Si atoms. There are two shorter (3.06 Å) and four longer (3.12 Å) Ho–Rh bond lengths. There are two shorter (3.06 Å) and four longer (3.09 Å) Ho–Si bond lengths. There are five inequivalent Rh sites. In the first Rh site, Rh is bonded in a distorted trigonal non-coplanar geometry to three equivalent Si atoms. There are one shorter (2.34 Å) and two longer (2.49 Å) Rh–Si bond lengths. In the second Rh site, Rh is bonded in a 4-coordinate geometry to two equivalent Ho and four Si atoms. There are a spread of Rh–Si bond distances ranging from 2.39–2.49 Å. In the third Rh site, Rh is bonded in a 4-coordinate geometry to two equivalent Ho and four Si atoms. There are a spread of Rh–Si bond distances ranging from 2.40–2.49 Å. In the fourth Rh site, Rh is bonded in a 4-coordinate geometry to two equivalent Ho and four Si atoms. There are a spread of Rh–Si bond distances ranging from 2.41–2.51 Å. In the fifth Rh site, Rh is bonded in a 5-coordinate geometry to five Si atoms. There are one shorter (2.37 Å) and four longer (2.52 Å) Rh–Si bond lengths. There are three inequivalent Si sites. In the first Si site, Si is bonded in a 10-coordinate geometry to two equivalent Ho and six Rh atoms. In the second Si site, Si is bonded in a 9-coordinate geometry to two equivalent Ho and seven Rh atoms. In the third Si site, Si is bonded in a 9-coordinate geometry to two equivalent Ho and seven Rh atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HoGa3 by Materials Project

HoGa3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded to twelve Ga atoms to form a mixture of face and corner-sharing HoGa12 cuboctahedra. There are six shorter (2.98 Å) and six longer (3.09 Å) Ho–Ga bond lengths. In the second Ho site, Ho is bonded to twelve Ga atoms to form a mixture of face and corner-sharing HoGa12 cuboctahedra. There are a spread of Ho–Ga bond distances ranging from 3.01–3.08 Å. There are two inequivalent Ga sites. In the first Ga site, Ga is bonded in a 12-coordinate geometry to four Ho and eight Ga atoms. There are a spread of Ga–Ga bond distances ranging from 2.92–3.08 Å. In the second Ga site, Ga is bonded in a 10-coordinate geometry to four Ho and six Ga atoms. Both Ga–Ga bond lengths are 2.71 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HoGa3 by Materials Project

HoGa3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded to twelve Ga atoms to form a mixture of corner and face-sharing HoGa12 cuboctahedra. There are six shorter (3.08 Å) and six longer (3.10 Å) Ho–Ga bond lengths. In the second Ho site, Ho is bonded to twelve Ga atoms to form a mixture of corner and face-sharing HoGa12 cuboctahedra. There are six shorter (2.97 Å) and six longer (3.08 Å) Ho–Ga bond lengths. There are two inequivalent Ga sites. In the first Ga site, Ga is bonded in a 10-coordinate geometry to four Ho and six Ga atoms. There are two shorter (2.73 Å) and four longer (2.92 Å) Ga–Ga bond lengths. In the second Ga site, Ga is bonded in a 12-coordinate geometry to four Ho and eight Ga atoms. All Ga–Ga bond lengths are 3.08 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HoAl by Materials Project

HoAl crystallizes in the orthorhombic Pbcm space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded in a 2-coordinate geometry to eight Al atoms. There are a spread of Ho–Al bond distances ranging from 3.05–3.38 Å. In the second Ho site, Ho is bonded in a 6-coordinate geometry to eight Al atoms. There are a spread of Ho–Al bond distances ranging from 3.05–3.53 Å. There are two inequivalent Al sites. In the first Al site, Al is bonded to eight Ho and four Al atoms to form a mixture of distorted corner, edge, and face-sharing AlHo8Al4 cuboctahedra. There are two shorter (2.72 Å) and two longer (2.81 Å) Al–Al bond lengths. In the second Al site, Al is bonded in a 10-coordinate geometry to eight Ho and two equivalent Al atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HoAl3 by Materials Project

HoAl3 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded to twelve Al atoms to form HoAl12 cuboctahedra that share corners with six equivalent HoAl12 cuboctahedra, edges with six equivalent AlHo4Al8 cuboctahedra, faces with six equivalent AlHo4Al8 cuboctahedra, and faces with eight equivalent HoAl12 cuboctahedra. There are six shorter (3.06 Å) and six longer (3.08 Å) Ho–Al bond lengths. In the second Ho site, Ho is bonded to twelve Al atoms to form HoAl12 cuboctahedra that share corners with six equivalent AlHo4Al8 cuboctahedra, corners with nine equivalent HoAl12 cuboctahedra, edges with six equivalent AlHo4Al8 cuboctahedra, faces with three equivalent AlHo4Al8 cuboctahedra, and faces with seven HoAl12 cuboctahedra. There are a spread of Ho–Al bond distances ranging from 3.02–3.09 Å. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 10-coordinate geometry to four Ho and six Al atoms. There are a spread of Al–Al bond distances ranging from 2.73–2.88 Å. In the second Al site, Al is bonded to four Ho and eight Al atoms to form distorted AlHo4Al8 cuboctahedra that share corners with four equivalent HoAl12 cuboctahedra, corners with six equivalent AlHo4Al8 cuboctahedra, edges with four equivalent AlHo4Al8 cuboctahedra, edges with six HoAl12 cuboctahedra, faces with four HoAl12 cuboctahedra, and faces with four equivalent AlHo4Al8 cuboctahedra. All Al–Al bond lengths are 3.08 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho2Hf2O5 by Materials Project

Ho2Hf2O5 crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded in a distorted body-centered cubic geometry to eight equivalent O atoms. All Ho–O bond lengths are 2.82 Å. In the second Ho site, Ho is bonded to twelve O atoms to form HoO12 cuboctahedra that share corners with four equivalent HoO12 cuboctahedra, faces with four equivalent HoO12 cuboctahedra, and faces with eight equivalent HfO5 square pyramids. There are eight shorter (2.71 Å) and four longer (2.90 Å) Ho–O bond lengths. Hf is bonded to five O atoms to form HfO5 square pyramids that share corners with five equivalent HfO5 square pyramids and faces with four equivalent HoO12 cuboctahedra. There are four shorter (2.07 Å) and one longer (2.08 Å) Hf–O bond lengths. There are two inequivalent O sites. In the first O site, O is bonded to four Ho and two equivalent Hf atoms to form a mixture of distorted edge, face, and corner-sharing OHo4Hf2 octahedra. The corner-sharing octahedra tilt angles range from 0–65°. In the second O site, O is bonded in a linear geometry to four equivalent Ho and two equivalent Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho5Ir3 by Materials Project

Ho5Ir3 crystallizes in the tetragonal P4/ncc space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded to five Ir atoms to form distorted HoIr5 trigonal bipyramids that share corners with four equivalent HoIr4 tetrahedra, corners with eleven equivalent HoIr5 trigonal bipyramids, an edgeedge with one HoIr4 tetrahedra, edges with six equivalent HoIr5 trigonal bipyramids, and faces with two equivalent HoIr5 trigonal bipyramids. There are a spread of Ho–Ir bond distances ranging from 2.88–3.12 Å. In the second Ho site, Ho is bonded to four equivalent Ir atoms to form HoIr4 tetrahedra that share corners with sixteen equivalent HoIr5 trigonal bipyramids, edges with two equivalent HoIr4 tetrahedra, and edges with four equivalent HoIr5 trigonal bipyramids. All Ho–Ir bond lengths are 2.84 Å. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a 8-coordinate geometry to eight Ho atoms. In the second Ir site, Ir is bonded in a 8-coordinate geometry to eight equivalent Ho atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho2Fe17C2 by Materials Project

Ho2Fe17C2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Ho is bonded in a distorted bent 120 degrees geometry to nine Fe and two equivalent C atoms. There are a spread of Ho–Fe bond distances ranging from 3.05–3.35 Å. Both Ho–C bond lengths are 2.51 Å. There are seven inequivalent Fe sites. In the first Fe site, Fe is bonded in a 2-coordinate geometry to one Ho and thirteen Fe atoms. There are a spread of Fe–Fe bond distances ranging from 2.40–2.73 Å. In the second Fe site, Fe is bonded to three equivalent Ho and nine Fe atoms to form FeHo3Fe9 cuboctahedra that share corners with nine FeHo3Fe9 cuboctahedra, corners with four equivalent CHo2Fe4 octahedra, edges with four FeHo3Fe9 cuboctahedra, faces with four FeHo3Fe9 cuboctahedra, and faces with two equivalent CHo2Fe4 octahedra. The corner-sharing octahedra tilt angles range from 63–69°. There are a spread of Fe–Fe bond distances ranging from 2.47–2.63 Å. In the third Fe site, Fe is bonded in a single-bond geometry to five Fe and one C atom. There are two shorter (2.47 Å) and one longer (2.56 Å) Fe–Fe bond lengths. The Fe–C bond length is 1.91 Å. In the fourth Fe site, Fe is bonded in a 12-coordinate geometry to two equivalent Ho and ten Fe atoms. There are two shorter (2.43 Å) and two longer (2.46 Å) Fe–Fe bond lengths. In the fifth Fe site, Fe is bonded in a single-bond geometry to six Fe and one C atom. Both Fe–Fe bond lengths are 2.43 Å. The Fe–C bond length is 1.86 Å. In the sixth Fe site, Fe is bonded to two equivalent Ho and ten Fe atoms to form distorted FeHo2Fe10 cuboctahedra that share corners with ten FeHo3Fe9 cuboctahedra, edges with two equivalent FeHo3Fe9 cuboctahedra, faces with six FeHo3Fe9 cuboctahedra, and faces with four equivalent CHo2Fe4 octahedra. In the seventh Fe site, Fe is bonded to two equivalent Ho and ten Fe atoms to form FeHo2Fe10 cuboctahedra that share corners with six FeHo3Fe9 cuboctahedra, corners with two equivalent CHo2Fe4 octahedra, edges with two equivalent FeHo3Fe9 cuboctahedra, faces with six FeHo3Fe9 cuboctahedra, and faces with two equivalent CHo2Fe4 octahedra. The corner-sharing octahedral tilt angles are 45°. C is bonded to two equivalent Ho and four Fe atoms to form CHo2Fe4 octahedra that share corners with six FeHo3Fe9 cuboctahedra, corners with two equivalent CHo2Fe4 octahedra, and faces with six FeHo2Fe10 cuboctahedra. The corner-sharing octahedral tilt angles are 62°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho5Ga3 by Materials Project

Ho5Ga3 crystallizes in the tetragonal P4/ncc space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded to five Ga atoms to form a mixture of distorted edge, face, and corner-sharing HoGa5 square pyramids. There are four shorter (3.02 Å) and one longer (3.29 Å) Ho–Ga bond lengths. In the second Ho site, Ho is bonded to five Ga atoms to form a mixture of distorted edge, face, and corner-sharing HoGa5 trigonal bipyramids. There are a spread of Ho–Ga bond distances ranging from 3.03–3.20 Å. There are two inequivalent Ga sites. In the first Ga site, Ga is bonded in a 9-coordinate geometry to eight Ho and one Ga atom. The Ga–Ga bond length is 2.64 Å. In the second Ga site, Ga is bonded in a 9-coordinate geometry to nine Ho atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho3(Si3Pd10)2 by Materials Project

Ho3(Pd10Si3)2 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded in a distorted tetrahedral geometry to four equivalent Pd atoms. All Ho–Pd bond lengths are 2.83 Å. In the second Ho site, Ho is bonded in a cuboctahedral geometry to twelve equivalent Pd atoms. All Ho–Pd bond lengths are 3.00 Å. There are two inequivalent Pd sites. In the first Pd site, Pd is bonded to one Ho and three equivalent Si atoms to form a mixture of corner and edge-sharing PdHoSi3 tetrahedra. All Pd–Si bond lengths are 2.48 Å. In the second Pd site, Pd is bonded in a 2-coordinate geometry to one Ho and two equivalent Si atoms. Both Pd–Si bond lengths are 2.43 Å. Si is bonded in a 8-coordinate geometry to eight Pd atoms.

36 MATERIALS SCIENCE↗