Computer Science
Scientific paper
Jun 1963
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1963gecoa..27..623g&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 27, Issue 6, pp.623-636
Computer Science
4
Scientific paper
The composition of phosphide and sulphide precipitates in the Canyon Diablo, Breece and Grant meteorites were examined with the electron microanalyzer. The phosphides had a composition of 15.5 wt% P, between 20 and 46 wt% Ni, 0.1 wt% Co with Fe as the remaining constituent. The sulfide precipitates had a composition of stoichiometric FeS with no solubility for Ni. The regions of swathing kamacite around the phosphide particles had a Ni depletion of from 0.5 to 2 wt%. Excluding the massive phosphides, which are unrelated to the kamacite structure, it is concluded that the schreibersite nucleated within the supersaturated kamacite in the temperature range from 700 to 500°C while rhabdite formed between 500 and 400°C. The variation in the composition of the phosphides is due to the limited diffusion of Ni from kamacite to the phosphide at lower temperatures. The very large troilite particles are formed directly from the molten state. However, sulfides also precipitate from the solid state below the eutectic temperature and grow with the rejection of both iron and nickel into the region surrounding the particle, called swathing kamacite.
Goldstein Joseph I.
Ogilvie Robert E.
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