Hematite grains: Size and coercive force from AF demagnetization at high temperatures

Details Hematite grains: Size and coercive force from AF demagnetization at high temperatures Hematite grains: Size and coercive force from AF demagnetization at high temperatures

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977pepi...13..272b&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 13, Issue 4, p. 272-275.

Physics

1

Scientific paper

The coercivity spectrum of low-field high-temperature partial thermoremanent magnetization (PTRM) of a synthetic hematite powder, extremely high at room temperature, decreases very slowly with increasing temperature up to 500°C then decreases rapidly, especially above 600°C. From the AF demagnetization curves at 600 and 650°C it is calculated, following the Néel's theory of single-domain particles that the grains carrying the PTRM have a mean coercive force of 23 +/- 5 kOe and a mean grain size of 0.40 +/- 0.15 μm, which is not significantly different from the mean grain size of 0.48 +/- 0.03 μm from electron micrograph observations.

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