Computer Science
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997m%26ps...32..637c&link_type=abstract
Meteoritics, vol. 32, pages 637-645
Computer Science
9
Scientific paper
Solid metal/liquid metal partition coefficients for Ag and Pd were determined experimentally as a function of the S concentration of the metallic liquid. Silver is incompatible in solid metal and strongly sensitive to the S-content of the metallic liquid; partition coefficients for Ag decrease more than an order of magnitude with increasing S-content of the metallic liquid and can be expressed as: k(Ag) = exp[ 0.772 ln [1 - 2 (1.09) XS] - 1.917], where k(Ag) is the molar solid metal/liquid metal partition coefficient and XS is the molar S-content of the metallic liquid. The partition coefficient of Pd is less variable but changes from modestly incompatible to modestly compatible in solid metal with increasing S-content of the metallic liquid: k(Pd) = exp[ -0.506 ln [1 - 2 (1.09) XS] - 0.723] With these new partition coefficients for Pd and a fractional crystallization model, Pd abundance trends recorded in iron meteorite groups are modeled successfully. Measured Ag distribution between troilite-rich nodules and adjacent metal in iron meteorites also agree well with experimental solid metal/liquid metal equilibrium values. However, observed Pd metal/nodule distributions do not agree with experimentally determined partition coefficients, suggesting a more complex history than simple solid metal/liquid metal equilibrium.
Chabot Nancy Lynne
Drake Michael J.
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