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Raman spectra of FeO, Fe 3 O 4 , α-Fe 2 O 3 , α-FeOOH, and γ-FeOOH, the common products of iron oxidation, have been measured. The spectra of FeO and Fe 3 O 4 appear to be identical. Armco iron oxidized in air at 250°C was examined by Raman spectroscopy after varying periods of exposure and the surface film was found to contain Fe 3 O 4 and α-Fe 2 O 3 .
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Thibeau et al. (1978) studied this question.
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