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Structure and dynamics of calcium aluminosilicate melts

Abstract : Because of their interesting properties as glass-forming systems, molten silicates play an important role in the geology of the Earth’s crust and mantle and are also of industrial interest for nuclear waste treatment. Research in these areas requires fundamental information on the microscopic structure and dynamics of silicate melts, but such measurements are hampered by the very high melting points of these systems. By extending the technique of aerodynamic levitation to inelastic neutron scattering, and also making use of inelastic synchrotron x-ray scattering, we have obtained results on the microscopic dynamics of silicates both above the melting point and in the supercooled regime. In particular, we have determined the temperature evolution of the viscosity and diffusion coefficient of calcium aluminosilicates, and thereby quantified the decrease in fragility of this glass-forming system as a function of increasing silica content. In parallel with our dynamical studies, we have performed x-ray and neutron diffraction experiments on the same compositions and temperatures in order to examine the local chemical order pertinent to the observed dynamical properties.
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Submitted on : Thursday, July 12, 2012 - 4:02:21 PM
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Jad Kozaily. Structure and dynamics of calcium aluminosilicate melts. Other. Université d'Orléans, 2012. English. ⟨NNT : 2012ORLE2003⟩. ⟨tel-00717373⟩

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