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Showing 1 to 13 of 13 for “"Synchrotron diffraction"”.
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Jahn-Teller distortions in layered nickel oxides
… crystal structure of NaNiO<sub>2</sub>, using synchrotron diffraction as a probe of the average structure, in conjunction with EXAFS and neutron total scattering as probes of the local structure, are presented. The neutron total scattering data is studied via modelling of large supercells. The …
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Development of a Robotic Positioning and Tracking System for a Research Laboratory
Measurement of residual stress using neutron or synchrotron diffraction relies on the accurate alignment of the sample in relation to the gauge volume of the instrument. Automatic sample alignment can be achieved using kinematic models of the positioning system provided the relevant kinematic …
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Microstructure and residual stress in hydrogenated amorphous silicon (a-Si:H) layers
… amorphous silicon in the layers is determined by synchrotron diffraction. The a-Si:H layers were deposited by hotwire chemical vapour deposition (HW -CVD) on a glass substrate at a growth temperature of 300°C and 500°C, respectively. The microstructural state from the diffraction phase has been …
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Optical instruments for characterization in the nano-scale
… of line spacing errors in X-ray blazed synchrotron diffraction gratings to the Angstrom scale in part two. Quantum dots have long been a reliable label in single-molecule applications due to their brightness and photo-stability. These desirable traits come at a price of a large …
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Effects of Laser Shock Peening on Residual Stress, Texture and Deformation Microstructure of Ti-6Al-4V Alloy
… Scanning Probe Microscopy, Conventional X-ray Diffraction, Synchrotron X-ray Diffraction, Electron BackScattered Diffraction, microhardness and nanoindentation have been used to characterize the laser shock peened Ti-6Al-4V alloy samples.The microstructure and surface modification of laser …
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Microstructural Evolution in Refractory Metal Multi-Component Alloy Systems
… pathway in RSA system by applying an in situ synchrotron diffraction diffracted-spot tracing approach to follow phase evolution during controlled thermal histories. Across AlTaTiZr and the canonical AlMoNbTaTiZr alloy, the method resolves the sequence of phase separation, ordering and …
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Evolution of the structure and properties of thermomechanically-processed metallic glasses
… thermal cycle was investigated with in-situ synchrotron diffraction and cryogenic resonant ultrasound spectroscopy. The results show an asymmetric structural evolution during cooling and heating, challenging the conventional view that the glassy state is isoconfigurational during cooling and …
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The 5-th element. A new high pressure high temperature allotrope
… The synthesis products were studied by X-ray diffraction and spectroscopic methods. The diffraction patterns collected from samples synthesized from highly purified boron powders (> 99.99 % purity) resemble those published by R.H. Wentorf in 1965 and described as a new boron form, but later …
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An investigation into the influence of microstructural condition on the superelastic behaviour in Ti-Nb-based alloys.
… cycle was determined, $\textit{in situ}$, using synchrotron radiation. To expand this dataset, the load-unload cycle was repeated at different temperatures in the range of -196$^{\circ}$C to 30$^{\circ}$C. The $\alpha^{\prime\prime}$ martensite was observed to form when cold rolled material was …
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Investigation effect of external stress on hydrogen solvus in a zircaloy-4 fuel cladding alloy: application of in situ diffraction technique and mesoscale phase-field simulation
… the experimental study, we utilized an in situ diffraction technique to investigate the evolution of hydride phase in a Zircaloy-4 material under different thermo-mechanical conditions. Zircaloy-4 tensile specimens with hydrogen concentrations ranging from 0 to 977 wppm were tested under …
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Effects of hydrogen uptake and yttrium doping on the oxidation of zirconium-yttrium alloys
… at temperatures ranging from 500C to 1100C. Synchrotron diffraction of the steam-exposed samples provided information about the hydrogen uptake through the intensity of the zirconium hydride phase, as well as identification of oxides formed. Powder diffraction samples were fabricated from …
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Automated detection of breast cancer using SAXS data and wavelet features
The overarching goal of this project was to improve breast cancer screening protocols first by collecting small angle x-ray scattering (SAXS) images from breast biopsy tissue, and second, by applying pattern recognition techniques as a semi-automatic screen. Wavelet based features were generated …
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Application of Radial Distribution Functions to Diffraction and Imaging Data: Interfacial Structures, Amorphous, Disordered Materials
… 6 demonstrate the application of PDF analysis to synchrotron-based powder diffraction data of two material case studies: the rare earth phosphate glass (REPG) (Gd2O3)0.230(P2O5)0.770, and four Ru based photo-isomers. The closest R…R rare earth separation, which governs optical properties of REPGs, …