" Soutenance de thèse de Alexey NOVIKOV. | Université d'Orléans

Université d'Orléans

Soutenance de thèse de Alexey NOVIKOV.

11/10/2017 - 09:30 - 11/10/2017 - 13:00

URL: http://www.univ-orleans.fr/actus/soutenances

Nom du contact: Etudes Doctorales

Courriel du contact: etudes.doctorales@univ-orleans.fr

Lieu: Auditorium Charles Sadron - 3E avenue de la Recherche Scientifique - campus CNRS Orléans

Titre: Structure and dynamics of aluminosilicate glasses and melts.

Discipline : Sciences des matériaux


Résumé :

Three ternary systems (SAS, BAS and ZAS) have been investigated during this PhD thesis. The main goals were the elaboration and characterization of previously poorly studied Sr, Ba and Zn aluminosilicate glasses. A systematic study has been carried out on glasses and in some cases on melts with various MO/Al2O3 (M = Sr, Ba, Zn) and SiO2/Al2O3 ratios. The compositions studied here cover a significant part of the ternary diagrams (from silicates to peraluminous glasses, from silica-poor to silica-rich compositions) and allowed expanding our knowledge of the vitrification domains in these systems. In order to obtain information on the structure and macroscopic properties of SAS, BAS and ZAS glasses, a multi-technique approach has been implemented. Such approach allows having a broad view on the systems and finding nano- to microscopic origins of macroscopic properties. The techniques used during this thesis probe short- (NMR, ND) to medium-range (Raman) scale and among the properties studied were density, viscosity and glass transition temperature. The data resulting from this thesis provides a better understanding of the changes in the structure and macroscopic properties of the aluminosilicate glasses produced by variations in MO/Al2O3 or SiO2/Al2O3, or by the nature of non-network forming cation.