Abstract
The iron meteorite Santa Catharina is an ataxite that contains 35% Ni. Laboratory made Fe–Ni alloys of this composition are called Invar alloys, due to their low thermal expansivity near room temperature. The heterogeneous phase composition of the meteorite, which is apparent from a metallographic examination, has been confirmed by thermomagnetic measurements1 and by more recent Mössbauer spectra and microprobe analysis2. The nature and origin of the alloy phases in Santa Catharina have been the subject of recent investigations3,4 and we report here Mössbauer spectra and X-ray diffraction measurements which show that the phase composition of the meteorite is similar to that obtained by electron irradiation of Fe–Ni Invar alloys5.
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Danon, J., Scorzelli, R., Souza-Azevedo, I. et al. Santa Catharina meteorite and phase composition of irradiated Fe–Ni Invar alloys. Nature 284, 537–538 (1980). https://doi.org/10.1038/284537a0
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DOI: https://doi.org/10.1038/284537a0
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