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Solid state physics, surfaces and interfaces
The deployment of renewable energies and limitation of greenhouse gas emission involve a growing use of permanent magnets to build the cores of electrical machines. However, the most powerful magnets (NdFeB sintered) require a non-sustainable use of critical raw materials (Dy, Tb). Optimizing the magnet microstructure is widely recognized as the most promising route to mitigate the dependency to these problematic materials. In this context, knowledge of the chemical composition and structure of the phases along the grain boundaries has become crucial to better understand the magnetic properties of magnets and improve the process route.The main objective of the thesis is to study the microstructure of sintered magnets developed at CEA-Grenoble and, more particularly, to precisely characterize the intergranular phases. The PhD will used the different facilities available on the nano-characterization platform (PFNC). Specifically, she/he will use advanced electronic microscopy techniques such as nanodiffraction and STEM/HAADF (scanning transmission electron microscopy/high angle annular dark field) coupled with X-EDS (Xray energy dispersive spectroscopy) that allow analysis of the structure and the chemistry composition at the atomic scale. Secondly, from the identification of phases located at grain boundaries, she/he will use the data to set up micro-magnetic simulation. This work carried out in close collaboration with the team in charge of the magnet manufacturing will make it possible to propose an optimization of the magnet composition and process parameters.
Département des Technologies des NanoMatériaux (LITEN)
Laboratoire de Nanocaractérisation et Nanosécurité
LITEN / DTNM / L2NCEA-Grenoble 38054 Grenoble Cedex 9, France
Phone number: 04 38 78 39 23
Université Grenoble Alpes
Ecole Doctorale de Physique de Grenoble
Start date on 01-10-2019
CEA-GrenobleINAC/SP2M/LEMMA17 rue des Martyrs38054 Grenoble Cedex 9
Phone number: 04 38 78 50 86
« The age limit is 26 years for PhD offers and 30 years old for post-doc offers. »