A magnetic study of titanomagnetite substituted by magnesium and aluminium

Details A magnetic study of titanomagnetite substituted by magnesium and aluminium A magnetic study of titanomagnetite substituted by magnesium and aluminium

Dec 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973pepi....7..437r&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 7, Issue 4, p. 437-444.

Physics

10

Scientific paper

Polycrystalline samples of two solid solution series Fe2.4-δ Mδ Ti0.6 O4 (where M = Al or Mg) have been prepared in the compositional range found in naturally occurring samples (0 < δ < 0.25). The variation of unit cell size, saturation magnetization and Curie point have been measured as a function of degree of substitution. The cell edge, a, falls with substitution for both series yielding determinative curves: (1)|a = (8.485 +/- 0.001) - (0.07 +/- 0.02) δ + (0.16 +/- 0.09) δ2 for Mg, and (2)|a = (8.485 +/- 0.001) - (0.20 +/- 0.02) δ + (0.15 +/- 0.05) δ2 for Al (0 <= δ <= 0.25). The variation in saturation magnetization with substitution may be ascribed to: (1) the location of Al ions on octahedral sites together with the displacement of an equal number of Fe2+ ions onto tetrahedral sites; (2) an almost random distribution of Mg between the two sublattices. The Curie point falls as δ increases in both series, the effect of Al substitution being the greater. Using the data from the synthetic samples the effect of Al and Mg on the Curie points of titanomagnetites in a number of basalts is estimated. It is concluded that all the samples considered are appreciably non-stoichiometric and that this could lead, in some of the samples, to a reversed direction of natural remanent magnetization.

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