Origin of the cavities in black magnetic spherules

Details Origin of the cavities in black magnetic spherules Origin of the cavities in black magnetic spherules

Oct 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974jgr....79.4375d&link_type=abstract

Journal of Geophysical Research, vol. 79, Oct. 10, 1974, p. 4375-4378.

Mathematics

Logic

Cavities, Extraterrestrial Matter, Ferromagnetic Materials, Spherules, Atmospheric Composition, Chemical Composition, Microanalysis, Mineralogy, Oxidation, Particle Production, Reaction Kinetics, Space Environment Simulation, Textures, X Ray Diffraction

Scientific paper

Laboratory experiments of melting and cooling of Fe and Fe 90%-Ni 10% particles in atmospheres of both air and single-gas species whose vapor pressures varied in the range from 20 to 760 mm Hg are reported. The process that extraterrestrial ferromagnetic particulate matter in the range from 4 to 250 microns undergoes during its flight through the atmosphere is reproduced. The results of laboratory experiments indicate that cavities form as a result of complete oxidation of particles accompanied by a strong decrease in oxygen solubility and that natural black magnetic spherules are similar in mineralogic association and texture to artificial ones produced at low oxygen pressure.

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