Superparamagnetism in volcanic glasses of the KBS tuff Transmission electron microscopy and magnetic behavior

Details Superparamagnetism in volcanic glasses of the KBS tuff Transmission electron microscopy and magnetic behavior Superparamagnetism in volcanic glasses of the KBS tuff Transmission electron microscopy and magnetic behavior

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13..729s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 13, Aug. 1986, p. 729-732. Research supported by the University of Utah Rese

Physics

2

Electron Microscopy, Glass, Magnetic Properties, Paramagnetism, Volcanoes, Kenya, Magnetic Moments, Metal Oxides, Metal Particles, Particle Size Distribution, Photomicrography

Scientific paper

Volcanic glass separates (colorless to dark brown) from the KBS tuff of northern Kenya have been studied with a combination of transmission electron microscopy and low-temperature ac susceptibility and dc magnetization experiments. The darker of these glasses exhibit classic superparamagnetic behavior, the origin of which lies in a spatially uniform precipitate of magnetite, which is present as about 1 percent by weight in glass shards with the highest susceptibility. In any given glass separate (obtained by magnetic separation) this precipitate has a surprisingly narrow size distribution. A theory for the origin of the precipitate is nucleation and growth in quenched glasses at temperatures of about 1000-1300 K; an experiment demonstrates the feasibility of this idea. These glasses provide a sample for experimental investigations of physical properties of naturally occurring dispersed magnetic phases at the lower limit of physical dimension that can be attained in the crystalline state.

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