Physics
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998p%26ss...46..683h&link_type=abstract
Planet. Space Sci., Vol. 46, No. 6 - 7, p. 683 - 690
Physics
1
Venus Surface: Pressure, Venus Surface: Sulfur, Venus Atmosphere: Pressure, Venus Atmosphere: Sulfur
Scientific paper
The total pressure and molecular speciation of sulfur vapor (dominantly S2) over pyrite at Venus surface temperatures (≍390-470°C) are important for modelling atmospheric chemistry and geochemistry of sulfur gases and minerals on Venus. The sulfur vapor pressure over pyrite in CO2 and CO2 gas mixtures, which are relevant to Venus has not been previously measured. Instead, previous measurements were generally done in closed systems, such as sealed, evacuated silica tubes. The authors measured the sulfur vapor pressure over pyrite in an open system where carrier gas flowed through a gas mixing furnace, from 441 to 591°C in He, N2, CO2, and CO2-SO2-CO mixtures using a standard technique, the transpiration method (Merton and Bell, 1967). The data show that the sulfur vapor pressure over pyrite is the same in inert with literature vapor pressure data. Thermodynamic calculations show that the laboratory vapor pressure data are also valid at Venus surface pressures (≍50-100 bar). Finally, the authors present recommended values for the sulfur vapor pressure and calculate the molecular speciation of sulfur vapor over pyrite at Venus surface temperatures.
Fegley Bruce Jr.
Hong Yu
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