On the fine structure of meteoritical taenite/tetrataenite and its interpretation

Details On the fine structure of meteoritical taenite/tetrataenite and its interpretation On the fine structure of meteoritical taenite/tetrataenite and its interpretation

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983phys...27..314a&link_type=abstract

Physica Scripta (ISSN 0031-8949), vol. 27, no. 4, April 1983, p. 314-320. Research supported by the Statens Naturvidenskabelige

Physics

9

Fine Structure, Iron Meteorites, Meteoritic Composition, Meteoritic Microstructures, Nickel Compounds, Phase Diagrams, Curie Temperature, Face Centered Cubic Lattices, Ferromagnetic Materials, Gibbs Free Energy, Magnetic Effects, Mossbauer Effect, Order-Disorder Transformations, Thermal Stability, Transition Temperature

Scientific paper

TEM, electron microprobe, and Moessbauer spectroscopy are used in investigating taenite fields from several meteorites. A delicate pattern of antiphase domains is revealed in the tetrataenite, as is the presence of low-Ni taenite at the antiphase boundaries in what was hitherto believed to be pure tetrataenite. The observations suggest that the 'cloudy taenite' (cloudy zone II) was formed by a magnetically induced spinodal decomposition of the metastable taenite during slow cooling below 400 C. It is thought likely that decompositin occurs when the Curie temperature of the alloy changes rapidly with composition, as it does in f.c.c. iron-nickel alloys containing approximately 28-43 percent Ni (wt pct). The large contribution to Gibbs free energy from magnetic ordering leads to inflections in the Gibbs free energy curve, making the alloy unstable with regard to decomposition, in this case into a magnetically and atomically ordered Ni-rich alloy plus a magnetically and atomically disordered Ni-poor alloy. The model accounts well for the structure and composition of the two phases in the cloudy taenite.

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