Abstract
Phase relations in the condensed system Fe‐Os‐S were investigated by means of dry syntheses from the elements at 1180°, 1100° and 900°C. The Fe-rich sulfide melt dissolves only traces of Os. Fe 1‐xS dissolves up to 0.7 at.% Os at 1180 °C; Os solubility decreases to 0.3 at.% at 900°C. The S-rich sulfide melt dissolves up to 0.5 at.% Os at 1180 °C. The principal Fe‐Os alloys at all temperatures studied are cubic � (Fe,Os), rhombohedral (Os,Fe) and nearly pure Os. The bulk of Fe‐Os alloys coexist with Fe-rich sulfide melt and S-poor Fe 1‐xS; we provide Nernst partition coefficients for Os. The three-phase association alloy ‐ Fe1‐xS ‐ OsS 2 involves alloys with less than 1 at.% Fe. The solubility of Fe in OsS 2 increases with decreasing temperature and increasing fugacity of sulfur, possibly making analyses of erlichmanite for trace quantities of Fe important.
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