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Article Dans Une Revue Journal of Nuclear Materials Année : 2006

Kinetics of iron redox reactions in silicate liquids: A high-temperature X-ray absorption and Raman spectroscopy study

Résumé

The oxidation kinetics of a Fe-bearing supercooled liquid of the system SiO2–CaO–MgO–Na2O–FeO has been determined near the glass transition range by X-ray absorption near edge structure (XANES) and Raman spectroscopies. Both techniques yield room-temperature iron redox ratios in accord with wet chemical, Mössbauer and electron microprobe analyses. Similar oxidation kinetics have also been observed with both methods. At constant temperature, the kinetics obey an exponential law with a characteristic time that follows an Arrhenian temperature dependence. As redox changes are too fast to be accounted for in terms of diffusion of either ionic or molecular oxygen, these results lend further support to the idea that the rate-limiting factor for oxidation near the glass transition is diffusion of network-modifying cations along with a flux of electron holes.

Dates et versions

hal-00105823 , version 1 (12-10-2006)

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Citer

V. Magnien, D.R. Neuville, L. Cormier, J. Roux, Jean-Louis Hazemann, et al.. Kinetics of iron redox reactions in silicate liquids: A high-temperature X-ray absorption and Raman spectroscopy study. Journal of Nuclear Materials, 2006, 352, pp.190-195. ⟨10.1016/j.jnucmat.2006.02.053⟩. ⟨hal-00105823⟩
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