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

Sven Karup-Møller, E. Makovicky

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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
Volume40
Issue numberPart 2
Pages (from-to)499-507
ISSN0008-4476
DOIs
Publication statusPublished - 2002

Keywords

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

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