Transmission electron microscopy on iron monosulfide varieties from the Suizhou meteorite |
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Authors: | Ke Zhang He Zheng Jianbo Wang Renhui Wang |
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Institution: | (1) Department of Physics and Key Laboratory of Acoustic and Photonic Materials and Devices of Ministry of Education, Wuhan University, 430072 Wuhan, China;(2) Center for Electron Microscopy, Wuhan University, 430072 Wuhan, China |
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Abstract: | Transmission electron microscopy on the iron monosulfide (FeS) varieties from the Suizhou meteorite (Hubei, China) reveals
the intergrowth of primary hexagonal 2C troilite
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 1/4001]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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Keywords: | Iron monosulfide (FeS) Pyrrhotite Troilite Transmission electron microscopy Electron diffraction Suizhou meteorite |
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