Mathematics – Logic
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29r.530s&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 530
Mathematics
Logic
Iron Compounds, Meteoritic Composition, Nickel Compounds, Order-Disorder Transformations, Phase Transformations, Shock Heating, Mineralogy, Mossbauer Effect, Petrology, Scanning Electron Microscopy, X Ray Diffraction
Scientific paper
The Fe-Ni-ordered phase with superstructure L1O (tetrataenite) has been identified in metal particles of L and LL chondrites. We investigated by Mossbauer spectroscopy the presence of tetrataenite in metal particles of the Alfianello meteorite. According to its chemical-petrologic analysis, it was classified as an L6 ordinary chondrite. The analyzed specimen was recovered on February, 16, 1883, in Brescia, Italy. The bulk of the Alfianello chondrite has been previously studied by Mossbauer spectroscopy, X-ray diffraction, and scanning electron microscopy. The Mossbauer spectra show a complex superposition of iron silicates, kamacite, or martensite and troilite. Only after complete separation of the metallic phases is it possible to detect the presence of tetretaenite. Mossbauer spectra of the metal-enriched sample show the presence of a magnetic phase with quadrupole splitting typical of tetrataenite with an hyperfine field; a magnetic phase with QS = 0 and Hf = 310 kOe due to a disordered 50/150 Fe-Ni phase; a non-magnetic gamma phase due to the Ni-poor taenite. It is remarkable that the coexistence of tetrataenite with a significant proportion of the disordered 50/50 phase can be explained by the shock history of this meteorite. Shock and reheating can influence the tetrataenite degree of ordering, modifying the hyperfine parameters; the QS values may vary from QS = 0.25 mm/s for the Fe-Ni alloy with the largest degree of order down to QS = 0 for the disordered one.
Azevedo Souza I.
Bonazzi Alessandro
Ortalli I.
Pedrazzi Giuseppe
Scorzelli R. B.
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