Physics
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.276..168b&link_type=abstract
Nature, vol. 276, Nov. 9, 1978, p. 168, 169.
Physics
6
Microstructure, Crystallography, X-Ray Refraction, Corrosion, Concentrations, Iron, Nickel, Origin, Taenite, Superlattice, Santa Catharina Meteorite
Scientific paper
Investigations conducted by Petersen et al. (1977) and Albertsen et al. (1978) have provided evidence from Moessbauer spectroscopy and X-ray diffraction, that an FeNi superlattice exists in the taenite of the Cape York and Toluca meteorites. This superlattice, which had previously only been reported in neutron irradiated specimens, is thought to have formed during the extremely slow cooling, of the parent bodies of these meteorites. The discovery of the FeNi superlattice in a nickel-rich ataxite, Santa Catharina, is discussed. It is shown that in this meteorite the ordering occurred during terrestrial corrosion. Apart from some large idiomorphs of iron nickel phosphide and a dispersion of small plates of the phosphide, the Santa Catharina meteorite contains two main microstructural constituents, one of which is a face-centered cubic taenite containing 30.7 atom% Ni.
Bowles J. S.
Hatherly M.
Malin A. S.
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