The Raman spectra of Cr3O8 and Cr2O5

The Raman spectra of polycrystalline Cr3O8 and Cr2O5 powders were measured. The powders were prepared by thermal decomposition of CrO3 under flowing o xygen. Their composition was verified with x-ray diffraction. Raman spectra were excited with both 514.5 and 647.1 nm radiation. The spectral intensit ies were corrected for wavelength-dependent instrumental response. Tentativ e peak descriptions were made by comparison of the Cr3O8 and Cr2O5 spectra with reported spectra of crystalline chromium oxides. Copyright (C) 2001 Jo hn Wiley & Sons, Ltd.