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Full-Text Articles in Physical Sciences and Mathematics
Analyzing Nanoscale Thermal Transport Using Time-Resolved X-Ray Diffraction, James Grammich
Analyzing Nanoscale Thermal Transport Using Time-Resolved X-Ray Diffraction, James Grammich
College of Science and Health Theses and Dissertations
Classical models of thermal transport breakdown at lengthscales below a few microns in many materials, including the surfaces of bulk semiconductors. This presents difficulties in the analysis and design of small electronic devices, where unexpected thermal effects can occur such as hot spots that deteriorate performance and limit speed. Time-resolved x-ray diffraction has been proposed as one method to investigate this regime of nanoscale thermal transport, especially inside semiconductor materials where other techniques can not penetrate or yield quantitative results. Towards this goal, this thesis benchmarks a new, portable, and fast open-source x-ray dynamical diffraction code (TRXD) for strained crystals …
Multiwavelength X-Ray Diffraction, Maziar Saleh Ziabari
Multiwavelength X-Ray Diffraction, Maziar Saleh Ziabari
College of Science and Health Theses and Dissertations
The central problem of diffraction theory is determining the structure of an object given only the intensity of its diffraction pattern. In general, both the amplitude and phase must be known to uniquely solve a structure; however a coherent radiation source is usually required in order to measure the diffacted phases (e.g. in holography). In many important cases, coherent sources are unavailable and other assumptions or methods must be employed to substitute for the missing phase information. One method that has been successfully applied to the specific problem of determining atomic structure from X-ray diffraction intensity patterns has been the …
The Effect Of Grain Size And Forming Gas Reduction On The Electrical Properties Of Zinc Oxide, Rofeideh Mansourian
The Effect Of Grain Size And Forming Gas Reduction On The Electrical Properties Of Zinc Oxide, Rofeideh Mansourian
College of Science and Health Theses and Dissertations
Zinc oxide is an n-type transparent conducting oxide (TCO), which is used in solar cells and optoelectronics devices. ZnO has the potential to become the future choice for a wide range of TCO commercial applications replacing the current, more expensive, and toxic indium-based materials. The isothermal grain growth of ZnO nano-powders with two different initial grain sizes and the effect of forming gas reduction on their electrical properties were studied at 900 °C. The particle size was determined using synchrotron x-ray diffraction data and scanning electron micrographs. The grain size, shape, trace impurities, and synthesis methods had an effect on …