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| Author(s): |
Mauricio Bastos Estradiote
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Instituto de Física (IF/SBI) |
| Defense date: | 2025-02-26 |
| Examining board members: |
Sergio Luiz Morelhao;
Daniel Atencio;
Raul de Oliveira Freitas
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| Advisor: | Sergio Luiz Morelhao; Guilherme Calligaris de Andrade |
| Abstract | |
This dissertation presents an in-depth study of Diffuse Multiple Scattering (DMS) of X-rays, a second-order phenomenon that arises from the re-scattering of Diffuse Scattering (DS) by crystal planes. The work develops an innovative theoretical model that allows the quantification of DMS intensity based on the intensity distribution in reciprocal space, considering deviations from a perfect crystal lattice, such as those related to vibrational dynamics and lattice defects. The proposed model explores the Ewald construction, a geometrical tool that connects concepts such as Bragg cones, DS, and the Ewald sphere, to visualize and model the DMS intensity. Computational simulations demonstrate the model\'s capability to reproduce experimental images, considering different types of scattering and intensity distributions in reciprocal space, including isotropic and anisotropic DS. The application of the model to a standard copper sample reveals the potential of DMS as a structural characterization technique. Also presented is a generalized method for constructing three-dimensional reciprocal space maps, with the potential to be applied in various X-ray diffraction experiments, contributing in the analysis of structural variations in materials. In summary, this work explores DMS of X-rays, revealing its theoretical foundations and demonstrating its applicability in materials analysis. This work opens a new avenue for future research and applications of DMS in different areas of materials science, with the potential to furthering our knowledge about crystal defects and their influence on material properties. (AU) | |
| FAPESP's process: | 22/09531-8 - X-ray diffuse multiple scattering with high flux synchrotron sources: applications in thermoelectrics and topological insulators |
| Grantee: | Maurício Bastos Estradiote |
| Support Opportunities: | Scholarships in Brazil - Master |