Incongruent evaporation experiments on iron sulfide (Fe1-δS) under H2-rich (at 1 atm) and evacuated conditions

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Authors:Tsuchiyama, Akira; Uyeda, Chiaki; Makoshi, Yumi
Author Affiliations:Primary:
Osaka University, Department of Earth and Space Science, Toyonaka, Japan
Volume Title:Geochemical Journal
Source:Geochemical Journal, 31(5), p.289-302. Publisher: Geochemical Society of Japan, Nagoya, Japan. ISSN: 0016-7002
Publication Date:1997
Note:In English. 18 refs.; illus., incl. 3 tables, 2 plates
Summary:Evaporation experiments using pyrrhotite single crystals (Fe0.886S) were carried out at between 500 and 1300°C at 1 atm in an H2-CO2 gas flow (0.62-0.64 atm H2) and at 500 and 900°C in a vacuum. Under the H2-rich condition, spongy metallic iron layer was formed on the sulphide crystal surface at T < the Fe-FeS eutectic point as a result of incongruent evaporation. The linear rate constant obtained at various T obeys the Arrhenius relation: kFeS = (1.61 ± 0.42) × 10-3 exp(-115 ± 2[kJ/mol]/RT)[m/sec]. Evaporation coefficients of FeS were obtained by comparing the experimental results with calculated rates using the Hertz-Knudsen equation. They are small (1.4 × 10-4 - 9.4 × 10-6) due to slow surface reaction and/or slow escape of S-bearing gas species into the gas flow. In the evacuated experiments, evaporation occurred very slowly due to the absence of H2 gas. Iron residue layer was very thin or sometimes not detected. [H.Mi.]
Sections:Experimental mineralogy
Subsections:Non-silicates
Subjects:Chemical composition; Chemical fractionation; Concentration; Correlation; Evaporation; Experimental studies; High temperature; Iron sulfides; Laboratory studies; Pressure; Pyrrhotite; SEM data; Solar nebula; Sulfides; Sulfur; Temperature; Troilite; Vacuum fusion analysis
Abstract Numbers:01M/1624
Record ID:1998023688
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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