Photoacoustic spectroscopy applied to the study of clay soils

The optical absorption spectra and mineralogical composition of soil samples were characterized using photoacoustic spectroscopy and x-ray diffraction. The photoacoustic spectra observed showed transition bands associated with Fe 3+ ions in octahedral or tetrahedral symmetry. From the phase behavior...

Full description

Saved in:
Bibliographic Details
Published in:Review of Scientific Instruments 2003-01, Vol.74 (1), p.355-357
Main Authors: dos Santos, D. R., Toledo, R., Massunaga, M. S. O., Carrió, J. G., Auler, L. T., da Silva, E. C., Garcia-Quiroz, A., Vargas, H.
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The optical absorption spectra and mineralogical composition of soil samples were characterized using photoacoustic spectroscopy and x-ray diffraction. The photoacoustic spectra observed showed transition bands associated with Fe 3+ ions in octahedral or tetrahedral symmetry. From the phase behavior, both the nonradiative relaxation time τ and the characteristic thermal diffusion time τ β were determined. The x-ray diffraction analysis showed that kaolinite is a major crystalline phase (86 wt %) followed by minor quantities of anatase, gibbsite, and quartz. Rietveld refinements showed that the Fe 3+ cations partially substitute for Al 3+ cations in octahedral sites of the kaolinite structure.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1518553