STABILITY REGION AND OXYGEN STOICHIOMETRY OF MANGANESE FERRITE

The phase stability and oxygen stoichiometry of manganese ferrite were investigated for dependence on the oxygen partial pressure at 400 deg rees C-900 degrees C. As starting material, a reactive Mn-Fe-hydroxide precursor with defined composition was used. The samples were charact erized by X-ray diffractometry, Mossbauer spectroscopy and magnetic me asurements. The oxygen non-stoichiometry delta in differently prepared samples MnFe2O4+delta was determined by a solid electrolyte-based cou lometric technique (SEC). (C) 1998 Elsevier Science B.V. All rights re served.