CHAUSSEDENT , Stéphane

A simple transferable adaptive model is developed and it allows for the first time to simulate by Molecular Dynamics the separation of large phases in the MgO-SiO 2 binary system, as experimentally observed and as predicted by the phase diagram, meaning that separated phases have various compositions. This is a real improvement over...

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New rare-earth ion-doped optical fibres stand for potential applications in telecommunications, sensors, fibre lasers. Although silica-based optical fibres present attractive physical and economical properties as glass host, spectroscopic limitations appears when rare-earth ions are inserted in silica, such as clustering or inappropriate local...

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The development of new applications based on glass doped with nanoparticles is growing in interest during the last years. The structure and properties of Ca-based silicate nanoparticles formed in situ in a silica matrix through a phase separation mechanism were investigated by using Molecular Dynamics simulations and compared to nanoparticles...

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Cette étude révèle un nouvel aspect sur la structure de la silice à l'échelle nanométrique. L'orientation acquise par les petits anneaux (Si-O) n pour n ≤ 5 suite à la déformation à chaud persiste à froid et induit une anisotropie structurale dont la forme « isotropie transverse » est vérifiée par spectrométrie Raman.

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A novel aspect of the medium-range structure of silica drawn into fibers is studied. The network of silica glass structure is composed of corner-shared SiO 4 tetrahedra, and it can be seen as a structure of interconnected rings (Si-O) n of various size, denoted nMR (n-Membered Ring). Molecular Dynamics simulations show that small-sized silica...

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Europium (Eu)-doped silica nanoparticles have attracted great interest for different applications, in particular in biomedicine as biosensors or for tissue regeneration. Sol-gel is the most common process used to prepare those particles, with size varying from tens to hundreds of nanometers. In this article, we focus our attention on the...

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Rare-earth doped silica-based glasses lead the optical materials due to their tailorable spectroscopic and optical properties. In this context, we took advantage of the sol-gel process to prepare various Eu-doped silica glasses to study their luminescent properties before and after annealing at 900 • C. The effect of magnesium on these...

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International audience

International audience

International audience

International audience

Optical fibers form the basis for a wide range of applications that have grown considerably in technological impact recently, such as telecommunications, sensors, and lasers. These applications rely on the remarkable qualities of silica glass; particularly its significant mechanical and chemical stability, high optical damage threshold, low...