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- W2000788800 abstract "Abstract SiC‐based fibres are complex systems of nanophases. Raman imaging of polished Tyranno SA3 fibre (UBE Industry) sections indicated that carbon species have different concentrations, natures and short‐range order on the fibre core and surface, which results from the production process. The monitoring of the fibre's skin/bulk nanostructure, composition and geometry was performed on sections by Raman and Rayleigh microspectrometry. Owing to the weak light penetration in these materials, Rayleigh diffusion can map the surface geometry. The spatial correlation model applied to the LO SiC Raman mode at ca 969 cm −1 allowed us to estimate the size variation of the small SiC crystallites across the fibre. A model based on the I D / I G Raman peak ratio was used to calculate and map the size distribution of the carbon moieties. The position of the D′ Raman peak at ca 1620 cm −1 , which is correlated with the graphite in‐plane lattice contraction or expansion, allowed us to identify the intercalant ions. The fibre's core, which contains non‐aromatic carbon moieties, is corroded much faster than the periphery under an alkaline and oxidative environment (modelled by molten NaNO 3 and LiNO 3 ). This is considered to be linked to the nature of these carbon moieties and to their location (at triple points and grain boundaries), which constitutes a direct diffusion pathway. Copyright © 2003 John Wiley & Sons, Ltd." @default.
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- W2000788800 date "2003-10-01" @default.
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- W2000788800 title "Skin/bulk nanostructure and corrosion of SiC-based fibres: a surface Rayleigh and Raman study" @default.
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- W2000788800 doi "https://doi.org/10.1002/jrs.1053" @default.
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