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The kinetics and mechanism of iron sulfide formation in the solar nebula
https://doi.org/10.15094/00004704
https://doi.org/10.15094/0000470454f49a1c-604c-47be-9cc5-76acf02338c4
名前 / ファイル | ライセンス | アクション |
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KJ00000036510 (1.8 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1996-03-01 | |||||
タイトル | ||||||
タイトル | The kinetics and mechanism of iron sulfide formation in the solar nebula | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15094/00004704 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名(英) |
Lauretta,Dante S.
× Lauretta,Dante S.× Fegley, Bruce,Jr.× Lodders,Katharina× Kremser,Daniel T. |
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著者所属(英) | ||||||
en | ||||||
Planetary Chemistry Laboratory/Planetary Chemistry Laboratory/Planetary Chemistry Laboratory/Department of Earth and Planetary Sciences,Campus Box 1169, Washington University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | We summarize an experimental study of the kinetics and mechanism of FeS formation by the reaction of H_2S-H_2 gas mixtures with iron metal. Characterization of the reacted samples by optical microscopy, X-ray diffraction, electron microprobe analyses, and gravimetric analyses provided detailed information on the Fe/S ratio, microstructure and morphology, and formation kinetics of the iron sulfide layers. The Fe/S ratios of the iron sulfide layers varied from Fe_<0.90>S to FeS with temperature and gas composition, in agreement with models of gas-solid equilibrium. The morphology, microstructure, and growth orientation of the sulfide layers also varied with temperature and gas composition. Typically, sulfide layer growth proceeded by the development of a compact, uniformly oriented scale which later cracked when it could no longer plastically deform. Further reaction led to the growth of a finer grained, randomly oriented, highly porous inner layer between the metal and original sulfide scale. Initially sulfide layers grew linearly with time with the kinetics controlled by chemical reactions at the gas-solid interface. However, upon reaching a critical thickness, diffusion through the sulfide scale became the rate limiting step and layer growth followed parabolic kinetics. The linear and parabolic rate constants for iron sulfide growth were determined and then used to constrain FeS formation in the solar nebula. FeS formation is rapid compared to estimated nebular lifetimes of 1-10 million years. Our results also imply that the variations in the sulfur content of chondritic material are due to removal of metal grains from contact with the gas (e. g., by accretion into larger bodies) at temperatures above 400K, where complete sulfur condensation occurs, rather than by kinetic inhibition of gas-solid equilibrium between H_2S gas and iron metal grains. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA10784627 | |||||
書誌情報 |
Proceedings of the NIPR Symposium on Antarctic Meteorites 巻 9, p. 111-126, 発行日 1996-03 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |