Moessbauer spectroscopy and X-ray diffraction studies of Fe-Ni order-disorder processes in a 35 percent NI meteorite (Santa Catharina)

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Iron Meteorites, Meteoritic Microstructures, Mossbauer Effect, Nickel Alloys, Order-Disorder Transformations, X Ray Diffraction, Hyperfine Structure, Metallography, Photomicrography, Shock Waves

Scientific paper

Measurements by several physical methods, including metallographic techniques, electron microprobe analysis, Moessbauer spectroscopy, and X-ray diffraction, are reported which show that the bulk of the Ni-rich (35 percent) Santa Catharina meteorite consists of the Fe-Ni ordered phase with Ll0 superstructure. The presence of a smaller amount of another ferromagnetic Fe-Ni phase, probably with disordered structure, is shown. The average composition of the meteorite is the same as that in which Fe-Ni alloys show structural and magnetic Invar anomalies. The metal phases of the meteorite behave similarly to electron-irradiated Invar alloys of the same Fe-Ni composition.

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