Hematite-ilmenite (Fe2O3-FeTiO3) solid solutions: determinations of Fe-Ti order from magnetic properties

N. E. Brown, A. Navrotsky, G. L. Nord, S. K. Banerjee

Research output: Contribution to journalArticlepeer-review

81 Scopus citations

Abstract

The saturation magnetization, Ms(T), of samples with compositions spanning the ilmenite-hematite solid solution series has been measured at temperatures from 77 to 298 K. These data have been used to extrapolate to the saturation magnetization at 0 K. The saturation magnetization at 0 K is directly related to the distribution of Fe3+, Fe2+, and Ti4+ between the A and B sublattices of the ilmenite structure and can, therefore, be used to determine the order parameter, QMs, for each composition and annealing temperature. High coercivities exhibited by samples with composition xilm = 0.6 and xilm = 0.7 are related to the development of high TDB surface areas and short-range ordering. With subsequent annealing below the order-disorder transition, coercivities are drastically reduced. -from Authors

Original languageEnglish (US)
Pages (from-to)941-951
Number of pages11
JournalAmerican Mineralogist
Volume78
Issue number9-10
StatePublished - 1993
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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