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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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Origin of anomalous high-rate Na-ion electrochemistry in layered bismuth telluride anodes
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Direct Microscopy Imaging of Nonuniform Carrier Transport in Polycrystalline Cadmium Telluride
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Enabling Oxidation Protection and Carrier-Type Switching for Bismuth Telluride Nanoribbons via in Situ Organic Molecule Coating
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Chloride Treatments Improve Zinc Telluride Absorbers for Photoelectrochemical Carbon Dioxide Reduction
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Strain-tunable Berry curvature in quasi-two-dimensional chromium telluride
Magnetic transition metal chalcogenides form an emerging platform for exploring spin-orbit driven Berry phase phenomena owing to the nontrivial interplay between topology and magnetism. Here we show that the anomalous Hall effect in pristine Cr 2 Te 3 thin films manifests a unique temperature-dependent sign reversal at nonzero magnetization, resulting from the momentum-space Berry curvature as established by first-principles simulations. The sign change is strain tunable, enabled by the sharp and well-defined substrate/film interface in the quasi-two-dimensional Cr 2 Te 3 epitaxial films, revealed by scanning transmission electron microscopy and depth-sensitive polarized neutron reflectometry. This Berry phase effect further introduces hump-shaped Hall peaks in pristine Cr 2 Te 3 near the coercive field during the magnetization switching process, owing to the presence of strain-modulated magnetic layers/domains. The versatile interface tunability of Berry curvature in Cr 2 Te 3 thin films offers new opportunities for topological electronics.
Shifting and breaking scaling relations at transition metal telluride edges for selective electrochemical CO 2 reduction
The linear scaling relations can be shifted by the chemical composition and broken by edge reconstructions for selective CO 2 reduction.
Thermoelectric properties of high-performance n-type lead telluride measured in s itu in a nuclear reactor core
Thermoelectric properties measured in situ in the core of a nuclear reactor. High-performing thermoelectric material is tolerant to in-core irradiation.
Tellurolate: an effective Te-atom transfer reagent to prepare the triad of group 5 metal bis(tellurides)
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.
Enhanced thermoelectric efficiency in nanocrystalline bismuth telluride nanotubes
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.
Codeposition of ultrasmooth and high quantum efficiency cesium telluride photocathodes
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Iron telluride ladder compounds: Predicting the structural and magnetic properties of BaFe 2 Te 3
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.
High-enthalpy crystalline phases of cadmium telluride
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Evaluation and Benchmarking of a Commercial Cadmium Zinc Telluride (CZT) Gamma Imaging Camera
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Bonding of Bismuth Telluride Thermoelectrics with Lead-Borosilicate Glass.
Abstract not provided.
Computationally Predicting the Microstructure Formation of Bulk Bismuth Telluride (Bi2Te3) Parts
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