Abstract
Effect of pretreatment with Ca(II) or Mg(II) ions on the room-temperature coercivity and emission Mössbauer spectrum was studied for acicular γ-F2O3 particles having cobalt ions adsorbed in 3M NaOH solution range from 303 to 375K. When Ca(II)(or Mg(II)) ions particles prior to Co(II) ions adsorption above 341K(or Co-modified γ-F2O3 particles pretreated by Ca(I higher(or lower) than that without pretreatment. Emissi showed that the average internal magnetic field of tides pretreated with Ca(II) ions was larger than that ions. Effect of pretreatment with Ca(II) or Mg(II) ion ions on the surface of γ-F2O3 particles was discussed site preference of cations in ferrite and distribution ion in the temperature were adsorbed on γ-F2O3 303K), the coercivity of I)(or Mg(II)) ions was on Mössbauer spectroscopy Co-modified γ-F2O3 with Mg(II) s on adsorption of cobalt from the view point of ratio of each cation.
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