Matrix effects for reflectivity spectra of dispersed nanophase (superparamagnetic) hematite with application to Martian spectral data

Details Matrix effects for reflectivity spectra of dispersed nanophase (superparamagnetic) hematite with application to Martian spectral data Matrix effects for reflectivity spectra of dispersed nanophase (superparamagnetic) hematite with application to Martian spectral data

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.5101m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, April 10, 1990, p. 5101-5109.

Physics

59

Hematite, Light Scattering, Mars Surface, Mineral Exploration, Spectral Reflectance, Iron, Magnetic Properties, Mossbauer Effect, Spectrum Analysis, Spectra, Reflectivity, Hematite, Matrix, Comparisons, Concentration, Laboratory Studies, Color, Iron, Ferric Oxide, Magnetic Properties, Mars, Analogs, Mineralogy, Scattering, Absorption, Procedure, Spectroscopy

Scientific paper

The effect of the matrix on the reflectivity spectra of nanophase (superparamagnetic) hematite (np-Hm) dispersed within the matrix was investigated in four series of powder samples containing np-Hm dispersed within discrete powder particles (of two size ranges) of silica gel and activated alumina. The spectral data show that matrix effects are large. Samples with the same Fe2O3 content can have np-Hm absorption edges characterized by very different positions and curvature and slope indices, while samples with equivalent absorption edges can have very different Fe2O3 concentrations. Thus, quantitative relationships between the positions of ferric absorption edges and Fe2O3 concentrations are unreliable without knowledge of matrix properties of the system. It is shown that it was possible to match the Fe2O3 concentration, magnetic properties, and spectral data for Martian surface material with a laboratory mixture whose only ferric-bearing phase was hematite.

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