Abstract
Raman spectroscopy was applied to the characterization of the thin oxide layers produced on SUS304L stainless steel in Ar gases of several purities at 1273K andit was revealed that measurement of the incident angle dependency of Raman spectra from oxide layers makes it possible to identify the outer and inner regions of the two oxide layers on SUS304L. The oxide layer, produced in high purity Ar gas at 1273K-120s, consisted of MnCr2O4spinel type oxide. The oxide layer produced in 99.5%Ar + 0.5%O2 gas showed a double-layer structure, and the outer and the inner were identified with FeCr2O4 and Cr2O2 respectively. The frequency shift of Raman spectra from the powder standards has been shown to be induced by the compressive stress in the oxide layers on stainless steel, and the amount of compressive stresses was estimated.
