The system Fe-Os-S at 1180°, 1100°and 900°C

Sven Karup-Møller, E. Makovicky

Research output: Contribution to journalJournal articleResearchpeer-review


Phase relations in the condensed system Fe-Os-S were investigated by means of dry syntheses from the elements at 1180degrees, 1100degrees and 900degreesC. The Fe-rich sulfide melt dissolves only traces of Os. Fe1-xS dissolves up to 0.7 at.% Os at 1180degreesC; Os solubility decreases to 0.3 at.% at 900degreesC. The S-rich sulfide melt dissolves up to 0.5 at.%. Os at 1180degreesC. The principal Fe-Os alloys at all temperatures studied are cubic gamma (Fe,Os), rhombohedral (Os,Fe) and nearly pure Os. The bulk of Fe-Os alloys coexist with Fe-rich sulfide melt and S-poor Fe1-xS; we provide Nernst partition coefficients for Os. The three-phase association alloy-FeS1-xS-OsS2 involves alloys with less than 1 at.% Fe. The solubility of Fe in OsS2 increases with decreasing temperature and increasing fugacity of sulfur, possibly making analyses of erlichmanite for trace quantities of Fe important.
Original languageEnglish
JournalCanadian Mineralogist
Issue numberPart 2
Pages (from-to)499-507
Publication statusPublished - 2002


  • monosulfide solid-solution
  • iron-osmium alloys
  • X-ray diffraction
  • erlichmanite
  • system Fe-Os-S

Fingerprint Dive into the research topics of 'The system Fe-Os-S at 1180°, 1100°and 900°C'. Together they form a unique fingerprint.

Cite this