Transmission electron microscopy on iron monosulfide varieties from the Suizhou meteorite

Details Transmission electron microscopy on iron monosulfide varieties from the Suizhou meteorite Transmission electron microscopy on iron monosulfide varieties from the Suizhou meteorite

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008pcm....35..425z&link_type=abstract

Physics and Chemistry of Minerals, Volume 35, Issue 8, pp.425-432

Physics

Iron Monosulfide (Fes), Pyrrhotite, Troilite, Transmission Electron Microscopy, Electron Diffraction, Suizhou Meteorite

Scientific paper

Transmission electron microscopy on the iron monosulfide (FeS) varieties from the Suizhou meteorite (Hubei, China) reveals the intergrowth of primary hexagonal 2C troilite {left( {{text{SG}}:Pifmmodeexpandafterbarelseexpandafter\=fi{6}2c} right)} and minor monoclinic 4C pyrrhotite (SG: F2/ d) phases as nanometer-scale domain microstructure. In addition, anti-phase domain boundaries are found to present in the 2C troilite superstructure with the displacement vector 1/4[001]2C, which is expected to form during the translational symmetry breaking during cooling from higher symmetry, high-temperature modification of the NiAs-type (SG: P63/ mmc) structure. Furthermore, 60° rotation twinning about the pseudo-hexagonal c-axis is observed in the 4C pyrrhotite superstructure, which may result from rotation symmetry reduction induced by the ordered arrangements of metal vacancies through solid-state transformation during further cooling. All the above microstructural characteristics are discussed with consideration to the thermal metamorphism history experienced by the Suizhou meteorite.

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