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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 811 records · Page 45
All sourcesNASA NTRSDOE OSTI
NASA NTRS2015

Filled Co (sub X) Ni (sub 4-x) Sb (sub 12-y) Sn (sub Y) Skutterudites: Processing and Thermoelectric Properties

Skutterudites have proven to be a useful thermoelectric system as a result of their enhanced figure of merit (ZT1), cheap material cost, favorable mechanical properties, and good thermal stability. The majority of skutterudite interest in recent years has been focused on binary skutterudites like CoSb3 or CoAs3. Binary skutterudites are often double and triple filled, with a range of elements from the lanthanide series, in order to reduce the lattice component of thermal conductivity. Ternary and quaternary skutterudites, such as Co4Ge6Se6 or Ni4Sb8Sn4, provide additional paths to tune the electronic structure. The thermal conductivity can further be improved in these complex skutterudites by the introduction of fillers. The Co (sub X) Ni (sub 4-x) Sb (sub 12-y) Sn (sub Y) system has been investigated as both a p- and n-type thermoelectric material, and is stable up to 200 degrees Centigrade. Yb, Ce, and Dy fillers have been introduced into the skutterudite to study the influence of both the type and the quantity of fillers on processing conditions and thermoelectric properties. The system was processed through a multi-step technique that includes solidification, mechano-chemical alloying, and hot pressing which will be discussed along with thermoelectric transport properties.

Thermoelectricity↗
NASA NTRS2011

Reliability of Solder Materials (Sn-Pb and Pb-Free) for Deep Space Missions

The purpose of this study is to assess the experimental reliability results of miniaturized passive components (01005, 0201, 0402, 0603, 0805, and 1206) assembled using surface mounting processes with tin-lead (Sn-Pb) and lead-free (Pb-Free) solder alloys under extreme temperature deep space environments.

extreme temperatures↗
NASA NTRS2017

Infrared Continuum and Line Evolution of the Equatorial Ring Around SN 1987A

Spitzer observations of SN 1987A have now spanned more than a decade. Since day approximately 4000, mid-infrared (mid-IR) emission has been dominated by that from shock-heated dust in the equatorial ring (ER). From 6000 to 8000 days after the explosion, Spitzer observations included broadband photometry at 3.6-24 micrometer, and low and moderate resolution spectroscopy at 5-35 micrometer. Here we present later Spitzer observations, through day 10,377, which include only the broadband measurements at 3.6 and 4.5 micrometer. These data show that the 3.6 and 4.5 micrometer brightness has clearly begun to fade after day approximately 8500, and no longer tracks the X-ray emission as well as it did at earlier epochs. This can be explained by the destruction of the dust in the ER on timescales shorter than the cooling time for the shocked gas. We find that the evolution of the late time IR emission is also similar to the now fading optical emission. We provide the complete record of the IR emission lines, as seen by Spitzer prior to day 8000. The past evolution of the gas as seen by the IR emission lines seems largely consistent with the optical emission, although the IR [Fe(II)]and [Si(II)]lines show different, peculiar velocity structures.

Arendt, Richard G.↗
DOE OSTI2026

Broad frequency tuning of a Nb$_{3}$Sn superconducting microwave cavity for dark matter searches

We demonstrate a novel broad-frequency tuning mechanism for superconducting microwave cavities designed for dark matter searches. Using a Nb$_3$Sn-coated cigar-shaped cavity operating at approximately 9 GHz, we achieve continuous frequency tuning exceeding 1 GHz by mechanically separating the two cavity halves: a "tuning-by-opening" technique. Finite-element method simulations predict that radiative losses do not degrade the quality factor even for large openings, as a closed cavity with an intrinsic quality factor of $10^7$ maintains this value for apertures up to 9 mm, corresponding to a tuning range from 9.0 to 7.5 GHz. Experimental validation using both copper ring spacers and a continuous sliding mechanism confirms $Q_0$ values exceeding the dark matter quality factor across the entire explored frequency range, despite mechanical imperfections and film non-uniformities. This tuning approach avoids inserting elements into the resonant volume, making it particularly suitable for high-Q superconducting cavities in axion haloscope experiments and readily applicable to REBCO-based implementations capable of operating in multi-tesla magnetic fields.

Maiello, D. [Padua U.; INFN, Padua] (ORCID:0009000↗
DOE OSTI2020

Materials Data on Sn(NF2)4 by Materials Project

SnF6(FN2)2 crystallizes in the orthorhombic Pccn space group. The structure is zero-dimensional and consists of four tetrafluorostannane;dihydrofluoride molecules and eight FN2 clusters. In each FN2 cluster, there are two inequivalent N1+ sites. In the first N1+ site, N1+ is bonded in a bent 150 degrees geometry to one N1+ and one F1- atom. The N–N bond length is 1.11 Å. The N–F bond length is 1.94 Å. In the second N1+ site, N1+ is bonded in a single-bond geometry to one N1+ atom. F1- is bonded in a single-bond geometry to one N1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sn(NF3)2 by Materials Project

N2SnF6 is Calaverite-like structured and crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of two ammonia molecules and one tetrafluorostannane;dihydrofluoride molecule.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sn(CCl)2 by Materials Project

(C)2SnCl2 crystallizes in the orthorhombic Imma space group. The structure is one-dimensional and consists of four 7772-99-8 molecules and two C ribbons oriented in the (1, 0, 0) direction. In each C ribbon, C is bonded in a linear geometry to two equivalent C atoms. Both C–C bond lengths are 1.32 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sn(NF3)2 by Materials Project

N2SnF6 is Fluorite structured and crystallizes in the cubic Fm-3m space group. The structure is zero-dimensional and consists of eight ammonia molecules and four tetrafluorostannane;dihydrofluoride molecules.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sn(Mo2O3)2 by Materials Project

Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SrC2(SN)2 by Materials Project

Sr(SCN)2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Sr2+ is bonded in a 8-coordinate geometry to four equivalent N3- and four equivalent S2- atoms. There are two shorter (2.69 Å) and two longer (2.70 Å) Sr–N bond lengths. There are two shorter (3.20 Å) and two longer (3.28 Å) Sr–S bond lengths. C4+ is bonded in a distorted linear geometry to one N3- and one S2- atom. The C–N bond length is 1.19 Å. The C–S bond length is 1.62 Å. N3- is bonded in a 1-coordinate geometry to two equivalent Sr2+ and one C4+ atom. S2- is bonded in a 3-coordinate geometry to two equivalent Sr2+ and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BaC2(SN)2 by Materials Project

Ba(SCN)2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Ba2+ is bonded in a 8-coordinate geometry to four equivalent N3- and four equivalent S2- atoms. All Ba–N bond lengths are 2.87 Å. There are two shorter (3.34 Å) and two longer (3.41 Å) Ba–S bond lengths. C4+ is bonded in a distorted linear geometry to one N3- and one S2- atom. The C–N bond length is 1.19 Å. The C–S bond length is 1.63 Å. N3- is bonded in a distorted single-bond geometry to two equivalent Ba2+ and one C4+ atom. S2- is bonded in a 3-coordinate geometry to two equivalent Ba2+ and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaC2(SN)2 by Materials Project

Ca(NCS)2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Ca2+ is bonded in a 8-coordinate geometry to four equivalent N3- and four equivalent S2- atoms. All Ca–N bond lengths are 2.54 Å. There are two shorter (3.08 Å) and two longer (3.26 Å) Ca–S bond lengths. C4+ is bonded in a distorted linear geometry to one N3- and one S2- atom. The C–N bond length is 1.19 Å. The C–S bond length is 1.62 Å. N3- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and one C4+ atom. S2- is bonded in a 1-coordinate geometry to two equivalent Ca2+ and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PbC2(SN)2 by Materials Project

Pb(SCN)2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Pb2+ is bonded in a 8-coordinate geometry to four equivalent N3- and four equivalent S2- atoms. There are two shorter (2.72 Å) and two longer (2.74 Å) Pb–N bond lengths. There are two shorter (3.10 Å) and two longer (3.23 Å) Pb–S bond lengths. C4+ is bonded in a distorted linear geometry to one N3- and one S2- atom. The C–N bond length is 1.19 Å. The C–S bond length is 1.62 Å. N3- is bonded in a distorted single-bond geometry to two equivalent Pb2+ and one C4+ atom. S2- is bonded in a distorted single-bond geometry to two equivalent Pb2+ and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on EuC2(SN)2 by Materials Project

EuC2(NS)2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Eu2+ is bonded in a 8-coordinate geometry to four equivalent N3- and four equivalent S2- atoms. There are two shorter (2.64 Å) and two longer (2.65 Å) Eu–N bond lengths. There are two shorter (3.13 Å) and two longer (3.24 Å) Eu–S bond lengths. C4+ is bonded in a distorted linear geometry to one N3- and one S2- atom. The C–N bond length is 1.19 Å. The C–S bond length is 1.62 Å. N3- is bonded in a 1-coordinate geometry to two equivalent Eu2+ and one C4+ atom. S2- is bonded in a 1-coordinate geometry to two equivalent Eu2+ and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SN by Materials Project

NS crystallizes in the monoclinic P2_1/c space group. The structure is one-dimensional and consists of two NS ribbons oriented in the (0, 1, 0) direction. N1+ is bonded in a bent 120 degrees geometry to two equivalent S1- atoms. There is one shorter (1.60 Å) and one longer (1.62 Å) N–S bond length. S1- is bonded in a water-like geometry to two equivalent N1+ atoms.

36 MATERIALS SCIENCE↗