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- W2318056404 abstract "We explore a method to utilize the stoichiometry of iron sulfide to determine the sulfur fugacity in experiments containing CO-CO2-SO2 gas mixtures. The Fe-S phase diagram shows that the stoichiometry of iron sulfide melts is closely related to the sulfur fugacity ƒs2 at a given temperature and ambient pressure. We derive equations that relate the sulfur fugacity to the mole fraction of sulfur Xs in the iron sulfide from available literature data, and a solution model using the Redlich-Kister approximation for the excess Gibbs energy of mixing. We test the method by exposing iron sulfide to CO-CO2-SO2 gas mixtures and subsequently analyzing the “Fe-S monitor” for its stoichiometry. Most sulfur fugacities calculated from the equilibrium gas composition agree within 5-10% (1200 °C) and 1-4% (1400 °C) with those derived from the sulfur mole fraction in the monitor and literature data calibration, which is consistent with the spread observed in literature data. There were no suitable literature data for a full calibration at 1300 °C, so we combined the available literature and our data to find the sulfur fugacity as a function of mole fraction sulfur. Overall the Fe-S monitor technique is a convenient method to determine the sulfur fugacity in high-temperature experiments containing CO-CO2-SO2 gas mixtures as long as oxygen fugacities remain below that of the iron-wüstite or iron-magnetite buffer." @default.
- W2318056404 created "2016-06-24" @default.
- W2318056404 creator A5006248203 @default.
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- W2318056404 date "2013-08-01" @default.
- W2318056404 modified "2023-09-24" @default.
- W2318056404 title "Iron sulfide stoichiometry as a monitor of sulfur fugacity in gas-mixing experiments" @default.
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- W2318056404 doi "https://doi.org/10.2138/am.2013.4376" @default.
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