Thesis supervisor: Gábor Ribárik
Location of studies (in Hungarian): ELTE Institute of Physics and Astronomy, Department of Materials Physics Abbreviation of location of studies: ELTE
Description of the research topic:
"X-ray line profile analysis is a modern and efficient method of crystallography
to determine the microstructure of materials.
A newly developed 3-dimensional single-crystal diffraction synchrotron
measurement method allows the extraction of single-crystal information
from measurements of polycrystalline samples. During the evaluation, using a
special indexing procedure the orientation of the grains and the reflections
belonging to one grain can be identified and line profile analysis can be
performed on the high-resolution diffraction peaks.
In fact we obtain 3-dimensional X-ray profiles from these synchrotron
measurements, however, the current evaluation methods use only limited
information from these: during the procedure we usually reduce the data into
one-dimensional diffraction patterns and fit them with one-dimensional
theoretical patterns.
In the case of realistic 3-dimensional periodic microstructures by using a
recently developed modeling method based on FFT (Fast Fourier Transform).
it became possible to determine the stress and deformation space and it's
also possible to calculate 3-dimensional X-ray patterns from the these
mechanical fields. The defect structure is given by the internal strains
of the crystal defects.
During the planned PhD work, the candidate will apply the 3-dimensional
FFT-based modeling method and will further develop it for single crystals and
policrystalline materials and the synchrotron measurements will also be
compared to the 3-dimensional diffraction patterns obtained by modeling.
"
Required language skills: English Recommended language skills (in Hungarian): French Further requirements: "deep knowledge in materials science
good programming skills
"
Number of students who can be accepted: 2
Deadline for application: 2024-05-31
2024. IV. 17. ODT ülés Az ODT következő ülésére 2024. június 14-én, pénteken 10.00 órakor kerül sor a Semmelweis Egyetem Szenátusi termében (Bp. Üllői út 26. I. emelet).
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