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The phase system Fe-Ir-S at 1100, 1000 and 800°C

Published online by Cambridge University Press:  05 July 2018

E. Makovicky  and
S. Karup-Møller
E. Makovicky
Affiliation:
Department of Mineralogy, The Geological Central Institute, University of Copenhagen, Østervoldgade 10, DK 1350 Copenhagen K, Denmark
S. Karup-Møller
Affiliation:
Department of Geology and Geotechnical Engineering, The Technical University of Denmark, DK 2800 Lyngby, Denmark
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Abstract

Phase relations in the dry condensed Fe-Ir-S system were determined at 1100, 1000 and 800°C. Orientational runs were performed at 500°C. Between 1100 and 800°C, the system comprises five sulphides and an uninterrupted field of γ(Fe,Ir). Fe1-xS dissolves 5.8 at.% Ir at 1100°C, 3.4 at.% Ir at 1000°C and 1.0 at.% Ir at 800°C. The solubility of Fe in Ir2S3, IrS2 and IrS~3 increases with decreasing temperature, reaching 2.5 at.% in the latter two sulphides at 800°C. Thiospinel ‘FeIr2S4— is non-stoichiometric, from Fe22.3Ir19.8S58.0 to Fe18.9Ir23.1S58.0, depending on aS and aFe, i.e. on a phase association. Thiospinel is absent at 800 and 500°C.

Keywords

platinum group elementsiridiumphase system iron-iridium-sulphur
Type
Research Article
Information
Mineralogical Magazine , Volume 63 , Issue 3 , June 1999 , pp. 379 - 385
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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