Abstract
Vacancy ordering in synthetic Fe7S8at elevated temperature was studied using transmission electron microscopy. Two known idealized structures of Fe7S8are monoclinic and trigonal based upon ABCD and ABC stacking of Kagome nets, respectively. The TEM results indicate a tendency for Fe7S8to transform from monoclinic to trigonal between 200 and 300°C. A disordering of vacancies occurs above 300°C and yields a partially filled CdI2-type structure. The Curie magnetic transition is associated with this vacancy-ordering transition. On slow cooling, it was found that the vacancies are ordered such as to tend to restore the Kagome nets and lead to ABCD and ABC layering.
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