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Ordering, Incommensuration, and Phase Transitions in Pyrrhotite Part I: A TEM Study of Fe 7 S 8

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Vacancy ordering in synthetic Fe 7 S 8 at elevated temperature was studied using transmission electron microscopy. Two known idealized structures of Fe 7 S 8 are monoclinic and trigonal based upon ABCD and ABC stacking of Kagome nets, respectively. The TEM results indicate a tendency for Fe 7 S 8 to transform from monoclinic to trigonal between 200 and 300#&176;C. A disordering of vacancies occurs above 300#&176;C and yields a partially filled CdI 2 -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.

Document Type: Research Article

Affiliations: 1: Ames Laboratory and Department of Chemistry, Iowa State University, Ames, Iowa, 50011 2: Ames Laboratory and Department of Geological and Atmospheric Sciences, Iowa State University, Ames, Iowa, 50011

Publication date: July 1, 1996

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