1.PhD. thesis: : Influence of reaction bond on thermal expansion of Mg-based long-fiber composites
Supervisor: Mgr. Stanislav Kúdela, PhD., qkudela@stuba.sk
Anotation: Study of reaction bonding of composite system of light, low-alloy (1-3%) magnesium binary (MgLi) and ternary (MgLiZn and MgLiAl) alloys and continuous carbon fibers. Composite materials will be prepared by pressure infiltration method. Two types of carbon fibers will be used. Fibers type T300 with a disordered inner structure and low density, and Granoc fibers with an ordered inner structure and higher density. Composites will be studied by thermal cycling in dilatation measurements in longitudinal and transverse directions with respect to fiber orientation. In both cases, the fiber-matrix interface is stressed in both shear and normal directions so that the above experiments provide information on the functionality of the interfacial bond. Both lithium and aluminum are carbide-forming elements with various carbide-forming mechanisms. Therefore, we will focus on the individual mechanisms of interaction between the alloy and fibers as a possible mutual blocking or synergy of the effects of alloying elements on the formation of a functional interfacial bond. The extent of interphase interaction will be controlled by kinetic variables (concentration, infiltration temperature and time). These composite materials have a very high specific strength and therefore have a wide application potential.
Characteristics of supervisor:
The most important publications of supervisor:
More information https://is.stuba.sk/pracoviste/prehled_temat.pl?detail=81230;pracoviste=60
Institute: Institute of Materials Science
Study program: Advanced Materials and Materials Design
2. PhD. thesis: Numerical simulation and prediction of material behavior in the processes of surface heat treatment
Supervisor: doc. RNDr. Mária Behúlová, CSc., maria.behulova@stuba.sk
Anotation: Thesis will be focused on the study and numerical simulation of the development of high-strength surface layers in the progressive technologies of heat treatment of steels with the specific orientation on surface induction quenching and laser heat treatment. The object of the thesis will be development, verification and application of simulation models for the solution of coupled electro-magnetic, thermal, fluid and stress-strain fields in order to analyse the material behavior during surface heat treatment and to optimize chosen technological processes.
Characteristics of supervisor:
The most important publications of supervisor:
More information https://is.stuba.sk/pracoviste/prehled_temat.pl?detail=81239;pracoviste=60
Institute: Institute of Materials Science
Study program: Advanced Materials and Materials Design
3. PhD. thesis: Mapping novel oxides with nickel, palladium, copper and silver by evolutionary algorithms and DFT modelling
Supervisor: doc. Mgr. Mariana Derzsi, PhD., mariana.derzsi@stuba.sk
Anotation: The proposed PhD thesis focuses on discovery of novel transition metal oxides and exploring their potential as functional materials in the areas of all-oxides photovoltaics, electronics and catalysis by means of quantum-mechanical modelling. The task of the PhD student will be to map the potential energy surface of the novel oxides and search for stable bulk and nano phases employing evolutionary algorithms and DFT based methods. The main outcome of the PhD project is the detailed description of crystal, electronic and phonon structures and thermodynamics of the oxides. The targeted phases are new oxides with nickel, copper, palladium and silver. The main computational tools include VASP, CRYSTAL, XTALOPT, CALYPSO, PHONON and PHONONY. The PhD project will be carried under the national grant APVV-18-0168: Quest for novel inorganic compounds with nickel, palladium, copper and silver by DFT modelling and ion beam synthesis.
Characteristics of supervisor: Her expertise is atomic-scale modelling of crystalline matter using DFT based methods. The main line of her research is design of novel inorganic functional materials in close collaboration with experimentalists involving inorganic and material chemistry. She has significantly contributed to discovery and characterization of completely new electronic and magnetic material based on silver(II) including novel form of nanotube Ag2+F2, anomalously strong antiferromagnet Ag2+SO4, a candidate for silver analogue of high-temperature oxocuprate superconductors AgF2, or potentially first member of silver Ag2+-based multiferroic. In her on-going projects, her goal is to explore along similar lines a hidden potential of other fascinating late-transition metals starting with simple binary oxides. Very little is known about structural diversity and properties of these systems in comparison to their intensively technologically exploited earlier-transition counterparts. Much is yet to be discovered and a very exciting journey is ahead of us. She is recently enjoining this journey with her newly created lab and research team at the Slovak University of Technology and invite motivated students and young researchers to join her team.
The most important publications of supervisor:
- Derzsi, et al., Quest for Compounds at the Verge of Charge Transfer Instabilities: The Case of Silver(II) Chloride, CRYSTALS, 9(8), 423 (2019).
- Gawraczyński, et al., The silver route to cuprate analogs, PNAS, 116 (5) 1495-1500 (2019).
- Grzelak, et al., High pressure behavior of silver fluorides up to 40 GPa, INORG CHEM, 56 (23), 14651–14661 (2017).
- Grzelak, et al., Metal fluoride nanowires featuring square-planar building blocks in a high-pressure polymorph of AgF2, DALTON TRANS. 46, 14742-14745 (2017).
- Derzsi, et al., Structures of late transition metal monoxides from Jahn-Teller instabilities in the rock salt lattice, PHYS REV LETT 113, 025505 (2014).
More information
Institute: Advanced Technologies Research Institute
Study program: Advanced Materials and Materials Design