In situ Raman spectroscopy characterization of phase transformations at high temperature in ceramics and inorganic compound.
Studying materials under extreme conditions is of fundamental scientific importance and relevant for many diverse disciplines.
Basically, significant changes may occur when the material is subjected to high temperature, including phase transitions of many forms as well as chemical reactions, altering then its properties.
Therefore, the better knowledge and the real-time monitoring of these changes as well as the nature of the mechanisms involved are of great importance.
In recent years, CEMHTI laboratory has developed several techniques, mostly spectroscopic ones, perfectly adapted to materials under extreme conditions. Among these techniques, Raman spectroscopy (owing to its original time-resolved system) allows characterizing in situ the materials from room temperature up to liquid (> 2000 ° C), and, in a narrower temperature range, in its imaging mode.
In this thesis, the hematite-corundum family of general formula type
A2O3 will be explored, where A can be a trivalent cation 3d or 4d series, or even aluminum. This material family has particularly high melting temperatures. In addition to their interests as model compounds, especially for melting characterization, these materials are of major importance for industry and high temperature refractories. The case of spinels (ternary oxides based on iron or
aluminum) is also considered. These studies will benefit from the expertise acquired in other domains of CEMHTI (NMR -Infrared - refractory ceramics, etc.) to discuss the results obtained within spatial and temporal multi-scale approach.
Applications must directly be sent by e-mail to both supervisors with a detailed curriculum vitae and a copy of master transcript. The successful candidate will have a solid background in materials science, motivated with an interest in experimentation. Excellent analytical and teamwork skills are highly required.
Thesis supervisor: Dr Patrick SIMON
Thesis co-supervisor: Dr Mohamed-Ramzi AMMAR mohamed-ramzi.ammar@cnrs-orleans.fr
Pristupačnost
