Physics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pepi...46..184o&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 46, Issue 1-3, p. 184-196.
Physics
29
Scientific paper
Metastable titanomaghemite inverts to a multiphase intergrowth when heated above 250-300°C. In the present study, pure and aluminum-substituted titanomaghemites were heated to 600°C to produce inversion products. Saturation hysteresis properties-saturation magnetization (JS), saturation remanence (JRS), and coercive force (HC-were measured at intervals during heating and cooling between 20 and 600°C. X-ray cell edge and magnetic viscosity were measured at room temperature before and after heating. As a result of inversion, the magnetic and other physical properties changed considerably. JS of the final inversion product was always higher than JS of the starting titanomaghemite. Decreases in the ratio JRS/JS and in HC and an increase in magnetic viscosity after inversion reflect the subdivision of originally single-domain (SD) homogeneous titanomaghemite grains into superparamagnetic (SP) or nearly SP-size subgrains. The phase assemblage in the final inversion product depends on the degree of low-temperature oxidation of the starting titanomaghemite. The spinel phase in the intergrowth was near-stoichiometric titanomagnetite or magnetite, and the other phases included ilmenite, haematite, anatase, and/or pseudobrookite. Aluminum had no stabilizing effect on the titanomaghemite structure.
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