The system Pd-Fe-Ni-S at 900 and 725 degree C.

E. Makovicky, Sven Karup-Møller

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    The system Pd-Fe-Ni-S was studied at 900 and 725 degrees C by means of dry condensed charges. At both temperatures it is dominated by the phase relationships involving sulphide melt. Pd-Fe-Ni alloys with broad miscibility primarily coexist with the melt; they are relatively enriched in Pd, whereas the associated melt is enriched in Ni. With decreasing temperature the melt recedes from Fe-rich regions. The incompatibility of PdS (extensive solid solution with Ni) and mss at 900 degrees C is replaced by their co-crystallization (+/- disulphide(s) of Ni,Fe or +/- sulphide melt) at 725 degrees C. The Ni/Fe ratio in the melt changes regularly against that in mss with increasing S fugacity and Pd contents in these two phases. (Ni,Fe)(3+/-x)S-2 and Pd4S play important roles at 725 degrees C. The data offer an array of distribution coefficients and solubility values suitable for geological interpretations.
    Original languageEnglish
    JournalMineralogical Magazine
    Issue number397
    Pages (from-to)685-702
    Publication statusPublished - 1995


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