Abstract
The effect of temperature and oxygen partial pressure on the nonstoichiometry of two manganese oxides, manganosite (Mn1−ΔO) and hausmannite (Mn3−δO4), has been studied by thermogravimetry between 900 and 1400°C. It is concluded that cation vacancies and holes are the dominant defect species in manganosite over at least most of its stability range at high temperatures. For the low and also for the high temperature phase of hausmannite it was found that cation vacancies predominate at high oxygen activity, while manganese interstitials are the prevailing point defects at low oxygen activity. The relationships between thedefect structure of manganosite and its transport properties are discussed briefly.KeywordsPoint DefectManganese OxideCation VacancyTracer DiffusionDefect ClusterThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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