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

Published online by Cambridge University Press:  05 July 2018

Emil Makovicky  and
Sven Karup-Møller
Emil Makovicky
Affiliation:
Department of Mineralogy, Geological Institute, University of Copenhagen, 1350 Copenhagen, Denmark
Sven Karup-Møller
Affiliation:
Institute of Mineral Industry, Technical University of Denmark, 2800 Lyngby, Denmark
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Abstract

The system Pd-Fe-Ni-S was studied at 900 and 725°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°C is replaced by their co-crystallization (± disulphide(s) of Ni,Fe or ± sulphide melt) at 725°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±xS2 and Pd4S play important roles at 725°C. The data offer an array of distribution coefficients and solubility values suitable for geological interpretations.

Keywords

Pd-Fe-Ni-S systemplatinum-group elementspalladiumsulphide melt
Type
Experimental Mineralogy
Information
Mineralogical Magazine , Volume 59 , Issue 397 , December 1995 , pp. 685 - 702
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1995

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