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Theses

Etude in-situ de la céramisation des verres par spectroscopie d'impédance

Abstract : Glass-ceramics find applications in many fields such as the biomedical field where glass-ceramics are used as bone filling materials or as dental prosthesis, but also in the military field and even in our kitchens, as hotplates or cooking plates due to their thermal shock resistance properties. However, the mechanisms of the nucleation stage that precedes the growth stage from glass to glass-ceramics remain misunderstood to scientists, making it difficult to implement and optimise new processes.The main objective of this thesis is to develop a protocol for the analysis of glasses in temperature based on impedance spectroscopy measurements. To this end, different families of glass have been considered, including lithium silicates ("model" glasses), lithium aluminosilicates and sodium borosilicates. Through in situ (temperature-dependent) and ex situ (tempered glass after heat treatment) studies, we were able to highlight the signatures of the vitreous and crystalline phases. Thus, we were able to follow thermal phenomena such as nucleation, growth but also phase separation and more precisely the temperatures at the beginning and end of this phenomenon, which is difficult to observe. These studies by impedance spectroscopy are completed by structural and microstructural (X-ray diffraction and Raman spectroscopy in situ, NMR, Scanning Electron Microscopy) and thermal (Differential Scanning Calorimetry) analyses, which have enabled us to associate electrical and dielectric modifications with structural and microstructural modifications.
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Mélisande Chevaucherie. Etude in-situ de la céramisation des verres par spectroscopie d'impédance. Chimie théorique et/ou physique. Université Paris sciences et lettres, 2020. Français. ⟨NNT : 2020UPSLC029⟩. ⟨tel-03648456⟩

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