Abstract
Chemical states of a 140 μm silicon carbide fiber are determined by soft x-ray photo-absorption spectroscopy, using a magnetic projection photoelectron microscope, performed on the surface obtained by fracturing. The spectrum of the carbon core of the fiber has prominent π* and σ* resonance peaks and is very similar to that measured on highly oriented pyrolitic graphite, indicating a graphitic nature of the carbon core. The spectrum of the silicon carbide coating of the fiber reveals similar features to those of single-crystal silicon carbide, indicating that this coating is in the crystalline or polycrystalline phase.
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