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A-values reported activation energy Amsample Arag6n bound holes boundary cation diffusion cation interstitials cation tracer diffusion cation vacancies cationic composition Chapter 0ne Chem cited in Chapter Co1 _A0 cobalt tracer diffusion Cobaltous 0xide coulometric D*Co data sets decreases defect concentrations defect constants determined deviation from stoichiometry Dieckmann electrical conductivity electrons enthalpy entire stability range experimental data function of oxygen grain size high oxygen activities high temperatures increases with increasing jump frequency log a02 log a02(ref logarithm low oxygen activities magnetite majority defects mass changes near-boundary regions Non-Stoichiometric Non-Stoichiometric Compounds Normalized partial cation Nowotny oxide oxygen activity dependence oxygen content partial cation tracer phase stability range Phys point defect point defect structure polycrystalline pre-exponential factor reported in Ref Schmalzried single crystal solid lines solid solution spinel stability limit temperature dependencies temperatures between 1000 thermoelectric power thermopower Titanomagnetite TixFe1 tracer diffusion coefficients types of cation variation