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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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The linear scaling relations can be shifted by the chemical composition and broken by edge reconstructions for selective CO 2 reduction.
Thermoelectric properties measured in situ in the core of a nuclear reactor. High-performing thermoelectric material is tolerant to in-core irradiation.
We show in this work how lithium tellurolate Li(X) n TeCH 2 SiMe 3 (X = THF, n = 1, 1; X = 12- crown -4, n = 2, 2), can serve as an effective Te-atom transfer reagent to all group 5 transition metal halide precursors irrespective of their oxidation state.
We report on the thermal and thermoelectric properties of individual nanocrystalline Bi 2 Te 3 nanotubes synthesized by the solution phase method using 3ω method and a microfabricated testbench. Measurements show that the nanotubes offer improved ZT compared to bulk Bi 2 Te 3 near room temperature due to an enhanced Seebeck coefficient and suppressed thermal conductivity. This improvement in ZT originates from the nanocrystalline nature and low dimensionality of the nanotubes. Domain boundary filtering of low-energy electrons provides an enhanced Seebeck coefficient. The scattering of phonons at the surface of the nanotube leads to suppressed thermal conductivity. These have been theoretically analyzed using the Boltzmann equation based on the relaxation time approximation and Landauer approach. This work clearly demonstrates the possibility of achieving enhancement in thermoelectric efficiency by combining nanocrystalline and low-dimensional systems.
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Since the discovery of pressure-induced superconductivity in the two-leg ladder system BaFe 2 X 3 (X=S, Se), with the 3d iron electronic density n=6, quasi-one-dimensional iron-based ladders have attracted considerable attention. In this work, we use density-functional theory to predict that the novel n=6 iron ladder BaFe 2 Se 3 could be stable with a similar crystal structure as BaFe 2 Se 3 . Furthermore, our results also indicate that BaFe2Te3 will display a complex 2×2 block-type magnetic order. Due to the magnetic striction effects of this block order, BaFe2Te3 should be a magnetic noncollinear ferrielectric system with a net polarization 0.31μC/cm2. In summary, the similar electronic density and magnetic ground state of Te- and Se-based ladders indicates both should display similar properties. In particular, the physical and structural similarity with BaFe 2 Se 3 suggests that BaFe 2 Se 3 could become superconducting under high pressure.
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Diffusion bonding of tungsten electrodes to lead tellurium and lead tellurium-tin tellurium thermocouples
Constitutional studies of SnTe and Si-Ge metal systems, segmented Si-Ge-PdTe thermocouple efficiencies, and pore migration in PbSnTe thermoelements
Chemical and physical properties of Co-Si-Ge system and PbTe-MnTe system, and life testing of thermocouples
HgCdTe as IR satellite detector for terrestrial, atmospheric and ocean mapping, IR astronomy and optical communication
Metallurgical studies of eutectic alloys suitable for brazing MoSi2 to Si-Ge thermoelectric material
Knudsen effusion measurements of stoichiometric MnTe sublimation at high temperature and low pressure
High speed (Hg,Cd)Te photodiode detectors sensitive to 10.6 microns radiation with operating temperature range of 77 to 90 K