Abstract
Nuclear-grade graphites were characterized with the use of laser Raman spectra collected between 1100 and 2800 cm<sup>−1</sup>. Significant band broadening and wavenumber shifts were observed for the <i>D</i> band (1317 cm<sup>−1</sup>), the <i>G</i> band (1578 cm<sup>−1</sup>), and the <i>D</i>′ band (1612 cm<sup>−1</sup>) for samples treated at 1100°C in helium- or nitrogen-enriched atmospheres. Significant decreases in the domain sizes were calculated on the basis of these data. Very intense, broad bands located between 1700 and 2500 cm<sup>−1</sup> were observed for samples treated at high temperature in a nitrogen-enriched atmosphere. These bands have been assigned to oxidation products adsorbed on the graphite surface, and their appearance has been correlated with trace element analysis for all investigated graphites. It is proposed that silicon atoms inhibit metal-catalyzed oxidation of the graphites studied in this work.
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