Statistics – Applications
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.3126m&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, March 10, 1985, p. 3126-3144.
Statistics
Applications
138
Hematite, Iron Oxides, Magnetite, Mineralogy, Spectral Signatures, Crystal Structure, Magnetic Properties, Molecular Spectroscopy, Mossbauer Effect, Optical Properties, Particle Size Distribution, Planetary Surfaces, Powder (Particles), Remote Sensing, Spectral Reflectance
Scientific paper
The spectral properties (0.35-2.20 microns) of submicron powders of hematite, maghemite, magnetite, goethite, and lepidocrocite are determined. Other physicochemical data are obtained for the powders in order to determine if deviations from stoichiometry occur due to their small particle size, to determine their state of chemical and phase purity, and to determine the physical characteristics of the individual powders. The physicochemical data obtained include mean particle diameter, discrete particle shape, chemical composition, crystallographic phase, magnetic parameters, and Moessbauer parameters. The positions of the spectral features for the hematite, maghemite, and magnetite powders are independent of temperature over the interval between about +20 and -110 C. For the goethite and lepidocrocite powders, a small shift of about 0.02 micron to shorter wavelengths is observed for some of the features after cooling to about -110 C. The spectral properties of the iron oxides and oxyhydroxides are important not only for understanding the basic physics and chemistry of the compounds but also for applications such as the remote sensing of the earth and Mars.
Gibson Everett K. Jr.
Lauer Howard V. Jr.
Lawson Andrew C.
Morris Richard V.
Nace George Ann
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Spectral and other physicochemical properties of submicron powders of hematite (alpha-Fe2O3), maghemite (gamma-Fe2O3), magnetite (Fe3O4), goethite (alpha-FeOOH), and lepidocrocite (gamma-FeOOH) does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
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