Point defects and cation tracer diffusion in (CrxFe1 − x)3 − δO4 spinels

摘要: Abstract The deviation from stoichiometry, δ, in (CrxFe1−x)3−δO4 was measured by thermogravimetry at 1200 °C as a function of oxygen activity, aO2, and cationic composition, x. Moreover, cation tracer diffusion coefficients, D Me ∗ , for = Co, Cr, Fe Mn, were experimentally determined using radioactive isotopes, Co-60, Cr-51, Fe-59 Mn-54. δ versus log aO2 plots different x displayed S-shaped curves. experimental data suggested that vacancies interstitials the majority defects high low activities, respectively. V-shaped curves observed plots. activity dependence indicated Mn (CrxFe1− x)3−δO4 activities is governed interstitials. Mean mobilities derived combining non-stoichiometry information.