Abstract
Charge compensation by substituting univalent fluorine for divalent oxygen in spinel type ferrites was studied by preparing and analyzing single-phase polycrystalline materials. Starting with a 1:1 molar ratio of divalent fluorides and Fe2O3, charge compensation was mainly achieved by metal vacancies, although some Fe2+ was also present. The preparative method, unit cell dimensions, chemical compositions, magnetic moments at 90°K and Curie points for these compounds are given. Their properties can be interpreted as those of solid solutions of mainly γ-Fe2O3 and a stoichiometric fluorine ferrite M22+Fe3+O32−F−, where M is Mg, Mn, Co, Ni, or Zn.
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