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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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SMART mineral mapping: Synchrotron-based machine learning approach for 2D characterization with coup
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Synchrotron X-ray Raman scattering shows the changes of the Ca environment in C-S-H exposed to high pressure
Abstract not provided
Hematite-goethite ratios at pH 2?13 and 25?170 ?C: A time-resolved synchrotron X-ray diffraction stu
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Comparison of thresholding techniques for quantifying portland cement hydrates using synchrotron microtomography
Abstract not provided
Aqua regia digestion cannot completely extract Hg from biochar: A synchrotron-based study
Abstract not provided
Trace elemental behavior in the solar nebula: Synchrotron X-ray fluorescence analyses of CM and CR c
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Synchrotron resolved microscale and bulk mineralogy in manganese-rich soils and associated pedogenic concretions
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Elastoplastic transition in a metastable β-Titanium alloy, Timetal-18 – An in-situ synchrotron X-ray diffraction study
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The development of grain resolved stress fields around notch tips in soft-textured zirconium polycrystals: A three-dimensional synchrotron X-ray diffraction study
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Synchrotron X-ray spectroscopic study of the antiferromagnetic-ferromagnetic transition in Ni-doped FeRh epitaxial thin films
Here we investigate the change of magnetism and electronic structure across the antiferromagnetic (AFM)-ferromagnetic (FM) transition of Ni-doped FeRh epitaxial thin films by x-ray magnetic circular dichroism (XMCD) and hard x-ray photoemission spectroscopy (HAXPES). The Rh L edge XMCD results indicate that the remnant FM phase at low temperature possesses smaller Rh moment than the normal FM phase which can undergo AFM-FM transition. The HAXPES results confirm an increase of Rh 4d density of state at the Fermi level and a possible "well-screened" state at the Ni 2p photoemission in the FM phase. FM fluctuation of the inter-site Fe-Fe exchange coupling within the AFM phase can be interpreted from the temperature dependence of the Fe 2p HAXPES results.
Strain mapping of GaN substrates and epitaxial layers used for power electronic devices by synchrotr
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In-situ synchrotron X-ray diffraction of hydroxyapatite-zirconia composite during conventional and flash sintering
Here, we conducted in-situ X-ray diffraction to study the crystalline phase evolution in hydroxyapatite-zirconia composites during both conventional and flash sintering processes. Additionally, we examined the thermal history and microstructure of the composite under these sintering conditions. Despite both sintering methods reaching similar average temperatures, they yielded distinct results in terms of crystalline phase composition and microstructure. In the flash sintered samples, we observed a complete transformation of hydroxyapatite into α- tricalcium phosphate and a complete tetragonal to cubic phase transition in zirconia. Conversely, the conventionally sintered samples remained practically stable. Notably, the flash sintered samples exhibited needle-like microstructures, which were absent in their conventionally sintered counterparts. This divergence suggests that the application of an electric field plays a role in generating athermal effects during the sintering of hydroxyapatite-zirconia composites.