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Raman microspectroscopy of some iron oxides and oxyhydroxides.pdf

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Raman microspectroscopy of some iron oxides and oxyhydroxides

JOURNAL OF RAMAN SPECTROSCOPY, VOL. 28, 873è878 (1997) Microspectroscopy of Some Iron OxidesRaman and Oxyhydroxides D. L. A. S. and M. T.de Faria,1* Venaü ncio Silva2 de Oliveira1 1 Laborato? rio de Espectroscopia Molecular, Instituto de Qu??mica, Universidade de Sa8 o Paulo, CP 26077, 05599-970 Sa8 o Paulo, Brazil 2 Departamento de Engenharia Metalu? rgica e de Materiais, Escola Polite? cnica da Universidade de Sa8 o Paulo, 05599-970 Sa8 o Paulo, Brazil Hematite magnetite wu? stite (FeO), maghemite goethite (a-FeOOH), lepido-(a-Fe 2 O 3 ), (Fe 3 O 4 ), (c-Fe 2 O 3 ), crocite (c-FeOOH) and d-FeOOH were studied by Raman microscopy. Such compounds have already been studied by Raman spectroscopy, but there are some disagreements in the reported data. Here, Raman microscopy was employed to investigate the laser power dependence of the spectra of these oxides and oxyhydroxides. Low laser power was used for the reference spectra in order to minimize the risks of spectral changes due to sample degrada- tion. The results obtained show that increasing laser power causes the characteristic bands of hematite to show up in the spectra of most of the compounds studied whereas the hematite spectrum undergoes band broadening and band shifts. 1997 John Wiley Sons, Ltd.( J. Raman Spectrosc. 28, 873è878 (1997) No. of Figures : 7. No. of Tables : 2. No. of References : 35. INTRODUCTION The understanding of rusting mechanisms is of funda- mental importance in corrosion control and therefore it is very important from both the technological and eco- nomic points of view. Rust composition has been the subject of several investigations, mainly because it can provide insights into corrosion mechanisms.1,2 X-ray di?raction, IR absorption spectrometry and electrochemical methods are the techniques most often employed in such studies. Oxides and oxyhydroxides, the main metal corrosion products,3 strongly absorb infrared radiation but they are usually poor light scatterers. This is probably th