Kinetics of single-phase oxidation of titanomagnetite

Details Kinetics of single-phase oxidation of titanomagnetite Kinetics of single-phase oxidation of titanomagnetite

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pepi...63...58g&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 63, Issue 1-2, p. 58-65.

Physics

Scientific paper

Cell-edge-determined compositions and their change with time (t) during the single-phase oxidation in air of 0.3 +/- 0.15 μm synthetic titanomagnetites (TM) (Fe3 - xTixO4; where x = 0.2, 0.4, 0.6 or 0.8) to titanomagnetite are discussed in detail. The data indicate that the rate of TM oxidation in isothermal conditions is dependent on the degree of oxidation (Z) and particle composition (X): an increase of Z decreases the rate of oxidation; TM grains with x = 0.4 undergo the slowest oxidation, presumably as a result of cation ordering. For titanomagnetite with x = 0.8 the dependence of kinetics on the grain size (d) is studied in the range 0.3-1.2 μm. The influence of the above-mentioned parameters could be accounted for in terms of the distribution of vacancies and cations. Extrapolation of oxidation rates to low temperatures suggests that high oxidation (Z >= 0.8) requires time commensurate with the Earth's age, but that some oxidation would be expected for titanomagnetite maintained at 20° C in air for 1 Ma.

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