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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.

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At least 217 records · Page 12
All sourcesNASA NTRSDOE OSTI
NASA NTRS1993

Stratospheric NO(y) Measurements on the NASA DC-8 during AASE 2

We survey measurements of stratospheric NO(y) on the NASA DC-8 during AASE 2 in early 1992. Emphasis is on correlations with other long-lived species: O3, N2O, and CH4. No cases of extremely high NO(y)/O3 ratios were seen in 1992. This suggests that denitrification at higher altitudes was less pervasive than in 1989. Values of NO(y)/O3 in 1992 are comparable to, though perhaps lower than, those measured in 1989. The correlation of NO(y) with N2O changes over the course of the mission. Relative to the correlation for the whole season, low values of NO(y) occur in February, most notably on the 22nd. The reason for the low NO(y) is unknown It is generally too warm at DC-8 altitudes for the presence of PSC particles, but denitrification at higher altitudes, followed by descent, might account for the low values seen on 22 February. However, this may be unlikely since the NASA ER-2, flying during the same period, saw no evidence of denitrification at higher altitudes.

Weinheimer, A. J.↗
NASA NTRS2019

Explicit IMF B(sub y)-Effect Maximizes at Subauroral Latitudes (Dedicated to the Memory of Eigil Friis-Christensen)

The most important parameter in the coupling between solar wind and geomagnetic activity is the B(sub z)‐component of the interplanetary magnetic field (IMF). However, recent studies have shown that IMF B(sub y) is an additional, independent driver of geomagnetic activity. We use here local geomagnetic indices from a large network of magnetic stations to study how IMF B(sub y) affects geomagnetic activity at different latitudes for all solar wind and, separately, during coronal mass ejections. We show that geomagnetic activity, for all solar wind, is 20% stronger for B(sub y) > 0 than for B(sub y) < 0 at subauroral latitudes of about 60° corrected geomagnetic latitude. During coronal mass ejections, the B(sub y)‐effect is larger, about 40%, at slightly lower latitudes of about 57° (corrected geomagnetic) latitude. These results highlight the importance of the IMF B(sub y)‐component for space weather at different latitudes and must be taken into account in space weather modeling

Holappa, L.↗
DOE OSTI2020

Materials Data on Y(BC)2 by Materials Project

YB2C2 crystallizes in the tetragonal P4_2/mmc space group. The structure is three-dimensional. Y is bonded in a 8-coordinate geometry to eight equivalent B and eight equivalent C atoms. All Y–B bond lengths are 2.75 Å. All Y–C bond lengths are 2.72 Å. B is bonded in a 2-coordinate geometry to four equivalent Y and two equivalent C atoms. Both B–C bond lengths are 1.60 Å. C is bonded in a 2-coordinate geometry to four equivalent Y, two equivalent B, and one C atom. The C–C bond length is 1.43 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(FeGe)2 by Materials Project

YFe2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Y is bonded in a 8-coordinate geometry to eight equivalent Fe and eight equivalent Ge atoms. All Y–Fe bond lengths are 3.23 Å. All Y–Ge bond lengths are 3.10 Å. Fe is bonded to four equivalent Y and four equivalent Ge atoms to form a mixture of distorted edge, face, and corner-sharing FeY4Ge4 tetrahedra. All Fe–Ge bond lengths are 2.35 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Y, four equivalent Fe, and one Ge atom. The Ge–Ge bond length is 2.61 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(SiRh)2 by Materials Project

YRh2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Y is bonded in a 8-coordinate geometry to eight equivalent Rh and eight equivalent Si atoms. All Y–Rh bond lengths are 3.23 Å. All Y–Si bond lengths are 3.13 Å. Rh is bonded to four equivalent Y and four equivalent Si atoms to form a mixture of distorted face, edge, and corner-sharing RhY4Si4 tetrahedra. All Rh–Si bond lengths are 2.41 Å. Si is bonded in a 9-coordinate geometry to four equivalent Y, four equivalent Rh, and one Si atom. The Si–Si bond length is 2.44 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(CuGe)2 by Materials Project

YCu2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Y is bonded in a 8-coordinate geometry to eight equivalent Cu and eight equivalent Ge atoms. All Y–Cu bond lengths are 3.29 Å. All Y–Ge bond lengths are 3.12 Å. Cu is bonded to four equivalent Y and four equivalent Ge atoms to form a mixture of distorted corner, edge, and face-sharing CuY4Ge4 tetrahedra. All Cu–Ge bond lengths are 2.44 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Y, four equivalent Cu, and one Ge atom. The Ge–Ge bond length is 2.47 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(SiIr)2 by Materials Project

YIr2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Y is bonded in a 8-coordinate geometry to eight equivalent Ir and eight equivalent Si atoms. All Y–Ir bond lengths are 3.23 Å. All Y–Si bond lengths are 3.13 Å. Ir is bonded to four equivalent Y and four equivalent Si atoms to form a mixture of distorted corner, edge, and face-sharing IrY4Si4 tetrahedra. All Ir–Si bond lengths are 2.41 Å. Si is bonded in a 9-coordinate geometry to four equivalent Y, four equivalent Ir, and one Si atom. The Si–Si bond length is 2.43 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(NiGe)2 by Materials Project

YNi2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Y is bonded in a 8-coordinate geometry to eight equivalent Ni and eight equivalent Ge atoms. All Y–Ni bond lengths are 3.19 Å. All Y–Ge bond lengths are 3.14 Å. Ni is bonded in a 4-coordinate geometry to four equivalent Y and four equivalent Ge atoms. All Ni–Ge bond lengths are 2.36 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Y, four equivalent Ni, and one Ge atom. The Ge–Ge bond length is 2.53 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(BRh)4 by Materials Project

YRh4B4 crystallizes in the tetragonal P4_2/nmc space group. The structure is three-dimensional. Y is bonded in a 12-coordinate geometry to twelve equivalent Rh and twelve equivalent B atoms. There are four shorter (2.97 Å) and eight longer (3.18 Å) Y–Rh bond lengths. There are eight shorter (3.04 Å) and four longer (3.16 Å) Y–B bond lengths. Rh is bonded in a 5-coordinate geometry to three equivalent Y and five equivalent B atoms. There are a spread of Rh–B bond distances ranging from 2.21–2.25 Å. B is bonded in a 6-coordinate geometry to three equivalent Y, five equivalent Rh, and one B atom. The B–B bond length is 1.81 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(Zn10Ru)2 by Materials Project

Y(RuZn10)2 crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Y is bonded in a 4-coordinate geometry to sixteen Zn atoms. There are four shorter (3.09 Å) and twelve longer (3.16 Å) Y–Zn bond lengths. Ru is bonded to twelve Zn atoms to form RuZn12 cuboctahedra that share corners with six equivalent RuZn12 cuboctahedra, edges with eighteen equivalent ZnYZn10Ru cuboctahedra, and faces with six equivalent ZnYZn10Ru cuboctahedra. There are six shorter (2.53 Å) and six longer (2.77 Å) Ru–Zn bond lengths. There are three inequivalent Zn sites. In the first Zn site, Zn is bonded to one Y, one Ru, and ten Zn atoms to form distorted ZnYZn10Ru cuboctahedra that share corners with fifteen equivalent ZnYZn10Ru cuboctahedra, edges with two equivalent ZnYZn10Ru cuboctahedra, edges with three equivalent RuZn12 cuboctahedra, a faceface with one RuZn12 cuboctahedra, and faces with fifteen equivalent ZnYZn10Ru cuboctahedra. There are a spread of Zn–Zn bond distances ranging from 2.66–3.05 Å. In the second Zn site, Zn is bonded in a distorted linear geometry to two equivalent Y and twelve equivalent Zn atoms. In the third Zn site, Zn is bonded in a distorted linear geometry to two equivalent Ru and six equivalent Zn atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(PO3)3 by Materials Project

Y(PO3)3 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are four inequivalent Y3+ sites. In the first Y3+ site, Y3+ is bonded to six O2- atoms to form YO6 octahedra that share corners with six PO4 tetrahedra. There are a spread of Y–O bond distances ranging from 2.25–2.30 Å. In the second Y3+ site, Y3+ is bonded to six O2- atoms to form YO6 octahedra that share corners with six PO4 tetrahedra. There are a spread of Y–O bond distances ranging from 2.23–2.28 Å. In the third Y3+ site, Y3+ is bonded to six O2- atoms to form YO6 octahedra that share corners with six PO4 tetrahedra. There are a spread of Y–O bond distances ranging from 2.26–2.28 Å. In the fourth Y3+ site, Y3+ is bonded to six O2- atoms to form YO6 octahedra that share corners with six PO4 tetrahedra. There are two shorter (2.24 Å) and four longer (2.27 Å) Y–O bond lengths. There are nine inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two YO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 9–27°. There is two shorter (1.50 Å) and two longer (1.61 Å) P–O bond length. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two YO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 16–27°. There are a spread of P–O bond distances ranging from 1.49–1.61 Å. In the third P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two YO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 24–47°. There are a spread of P–O bond distances ranging from 1.50–1.62 Å. In the fourth P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two YO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 28–35°. There are a spread of P–O bond distances ranging from 1.49–1.61 Å. In the fifth P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two YO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedral tilt angles are 30°. There are a spread of P–O bond distances ranging from 1.50–1.61 Å. In the sixth P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two YO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 24–35°. There are a spread of P–O bond distances ranging from 1.50–1.62 Å. In the seventh P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two equivalent YO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 10–25°. There is two shorter (1.50 Å) and two longer (1.60 Å) P–O bond length. In the eighth P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two equivalent YO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 28–39°. There are a spread of P–O bond distances ranging from 1.50–1.62 Å. In the ninth P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two YO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 25–28°. There is two shorter (1.50 Å) and two longer (1.61 Å) P–O bond length. There are twenty-seven inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 150 degrees geometry to one Y3+ and one P5+ atom. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Y3+ and one P5+ atom. In the third O2- site, O2- is bonded in a bent 150 degrees geometry to one Y3+ and one P5+ atom. In the fourth O2- site, O2- is bonded in a bent 150 degrees geometry to one Y3+ and one P5+ atom. In the fifth O2- site, O2- is bonded in a bent 150 degrees geometry to two P5+ atoms. In the sixth O2- site, O2- is bonded in a bent 120 degrees geometry to two P5+ atoms. In the seventh O2- site, O2- is bonded in a bent 150 degrees geometry to two P5+ atoms. In the eighth O2- site, O2- is bonded in a bent 150 degrees geometry to one Y3+ and one P5+ atom. In the ninth O2- site, O2- is bonded in a linear geometry to one Y3+ and one P5+ atom. In the tenth O2- site, O2- is bonded in a distorted linear geometry to one Y3+ and one P5+ atom. In the eleventh O2- site, O2- is bonded in a bent 150 degrees geometry to one Y3+ and one P5+ atom. In the twelfth O2- site, O2- is bonded in a bent 150 degrees geometry to one Y3+ and one P5+ atom. In the thirteenth O2- site, O2- is bonded in a 2-coordinate geometry to one Y3+ and one P5+ atom. In the fourteenth O2- site, O2- is bonded in a bent 150 degrees geometry to one Y3+ and one P5+ atom. In the fifteenth O2- site, O2- is bonded in a bent 150 degrees geometry to one Y3+ and one P5+ atom. In the sixteenth O2- site, O2- is bonded in a bent 150 degrees geometry to one Y3+ and one P5+ atom. In the seventeenth O2- site, O2- is bonded in a bent 150 degrees geometry to one Y3+ and one P5+ atom. In the eighteenth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Y3+ and one P5+ atom. In the nineteenth O2- site, O2- is bonded in a bent 150 degrees geometry to one Y3+ and one P5+ atom. In the twentieth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two P5+ atoms. In the twenty-first O2- site, O2- is bonded in a bent 150 degrees geometry to two P5+ atoms. In the twenty-second O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two P5+ atoms. In the twenty-third O2- site, O2- is bonded in a bent 150 degrees geometry to two P5+ atoms. In the twenty-fourth O2- site, O2- is bonded in a bent 150 degrees geometry to two P5+ atoms. In the twenty-fifth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two P5+ atoms. In the twenty-sixth O2- site, O2- is bonded in a linear geometry to one Y3+ and one P5+ atom. In the twenty-seventh O2- site, O2- is bonded in a bent 150 degrees geometry to one Y3+ and one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(BC)2 by Materials Project

YB2C2 crystallizes in the tetragonal P4/mbm space group. The structure is three-dimensional. Y is bonded in a 8-coordinate geometry to eight equivalent B and eight equivalent C atoms. All Y–B bond lengths are 2.74 Å. All Y–C bond lengths are 2.69 Å. B is bonded in a distorted trigonal planar geometry to four equivalent Y and three equivalent C atoms. There is one shorter (1.52 Å) and two longer (1.60 Å) B–C bond length. C is bonded in a 3-coordinate geometry to four equivalent Y and three equivalent B atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(Fe2Si)2 by Materials Project

YFe4Si2 crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Y is bonded in a 6-coordinate geometry to twelve equivalent Fe and six equivalent Si atoms. There are four shorter (3.11 Å) and eight longer (3.19 Å) Y–Fe bond lengths. There are two shorter (2.81 Å) and four longer (2.89 Å) Y–Si bond lengths. Fe is bonded in a 12-coordinate geometry to three equivalent Y, six equivalent Fe, and three equivalent Si atoms. There are a spread of Fe–Fe bond distances ranging from 2.39–2.69 Å. There are one shorter (2.36 Å) and two longer (2.39 Å) Fe–Si bond lengths. Si is bonded in a 9-coordinate geometry to three equivalent Y and six equivalent Fe atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(ClO4)3 by Materials Project

Y(O4Cl)3 crystallizes in the hexagonal P6_3/m space group. The structure is three-dimensional. Y is bonded in a 9-coordinate geometry to nine O atoms. There are six shorter (2.38 Å) and three longer (2.51 Å) Y–O bond lengths. There are three inequivalent O sites. In the first O site, O is bonded in a bent 150 degrees geometry to one Y and one Cl atom. The O–Cl bond length is 1.47 Å. In the second O site, O is bonded in a single-bond geometry to one Cl atom. The O–Cl bond length is 1.42 Å. In the third O site, O is bonded in a distorted bent 150 degrees geometry to one Y and one Cl atom. The O–Cl bond length is 1.46 Å. Cl is bonded in a tetrahedral geometry to four O atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(SiIr)2 by Materials Project

YIr2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Y is bonded in a 8-coordinate geometry to eight equivalent Ir and eight equivalent Si atoms. All Y–Ir bond lengths are 3.24 Å. All Y–Si bond lengths are 3.25 Å. Ir is bonded in a 9-coordinate geometry to four equivalent Y, one Ir, and four equivalent Si atoms. The Ir–Ir bond length is 2.61 Å. All Ir–Si bond lengths are 2.40 Å. Si is bonded in a 4-coordinate geometry to four equivalent Y and four equivalent Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(PPd)2 by Materials Project

YPd2P2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Y is bonded in a 8-coordinate geometry to eight equivalent Pd and eight equivalent P atoms. All Y–Pd bond lengths are 3.22 Å. All Y–P bond lengths are 3.10 Å. Pd is bonded to four equivalent Y, four equivalent Pd, and four equivalent P atoms to form a mixture of distorted corner, edge, and face-sharing PdY4P4Pd4 cuboctahedra. All Pd–Pd bond lengths are 2.90 Å. All Pd–P bond lengths are 2.47 Å. P is bonded in a 9-coordinate geometry to four equivalent Y, four equivalent Pd, and one P atom. The P–P bond length is 2.21 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2021

Coupled electronic and magnetic relaxation in Fe 1+y Te: direct evidence for the interaction between itinerant carriers and local moments

Iron chalcogenides are of particular interests among iron-based superconductors due to their distinct properties such as high-T c on FeSe monolayer and competing magnetic correlations in Fe 1+y Te. Here, in this work, we report unusual transport properties observed near the critical composition of Fe 1+y Te (y ~ 0.09) where competing magnetic correlations exist. The resistivity exhibits surprising temperature-dependent relaxation behavior below T N , resulting in the increase of resistivity with time for 35 K < T < T N , but the decrease of resistivity with time for 10 K < T < 35 K. Such resistivity relaxation is intimately coupled to the magnetization relaxation and can be attributed to the glassy magnetic states induced by the competing magnetic orders. These findings demonstrate strong coupling between itinerant carriers and local ordered moments in Fe 1+y Te.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
DOE OSTI2023

Photochemical Decomposition of Y‐Series Non‐Fullerene Acceptors Is Responsible for Degradation of High‐Efficiency Organic Solar Cells

Abstract Organic photovoltaic cells that employ Y‐series non‐fullerene acceptors (NFAs) have recently achieved impressive power‐conversion efficiencies (>18%). To fulfill their commercial promise, it is important to quantify their operational lifetimes and understand their degradation mechanisms. In this work, the spectral‐dependent photostability of films and solar cells comprising several Y‐series acceptors and the donor polymer PM6 is investigated systematically. By applying longpass filters during aging, it is shown that UV/near‐UV photons are responsible for the photochemical decomposition of Y‐series acceptors; this degradation is the primary driver of early solar cell performance losses. Using mass spectrometry, the vinylene linkage between the core and electron‐accepting moieties of Y‐series acceptors is identified as the weak point susceptible to cleavage under UV‐illumination. Employing a series of device characterization, along with numerical simulations, the efficiency losses in organic photovoltaic cells are attributed to the formation of traps, which reduces charge extraction efficiency and facilitates non‐radiative recombination as the Y‐series acceptors degrade. This study provides new insights for molecular degradation of organic photovoltaic absorber materials and highlights the importance of future molecular design and strategies for improved solar cell stability.

14 SOLAR ENERGY↗