Structure sensitivity of pyrite oxidation; comparison of the (100) and (111) planes

Abstract

Other| December 01, 1998 Structure sensitivity of pyrite oxidation; comparison of the (100) and (111) planes Jeffrey M. Guevremont; Jeffrey M. Guevremont Temple University, Department of Chemistry, Philadelphia, PA, United States Search for other works by this author on: GSW Google Scholar Alicia R. Elseinow; Alicia R. Elseinow Search for other works by this author on: GSW Google Scholar Daniel R. Strongin; Daniel R. Strongin Search for other works by this author on: GSW Google Scholar Joakim Bebie; Joakim Bebie Search for other works by this author on: GSW Google Scholar Martin A. A. Schoonen Martin A. A. Schoonen Search for other works by this author on: GSW Google Scholar American Mineralogist (1998) 83 (11-12_Part_1): 1353–1356. https://doi.org/10.2138/am-1998-11-1225 Article history first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Jeffrey M. Guevremont, Alicia R. Elseinow, Daniel R. Strongin, Joakim Bebie, Martin A. A. Schoonen; Structure sensitivity of pyrite oxidation; comparison of the (100) and (111) planes. American Mineralogist 1998;; 83 (11-12_Part_1): 1353–1356. doi: https://doi.org/10.2138/am-1998-11-1225 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyAmerican Mineralogist Search Advanced Search Abstract The interaction of atomically clean (100) and (111) crystallographic planes of FeS 2 with H 2 O vapor, O 2 , and a H 2 O/O 2 mixture was investigated. A combined high pressure/ultra-high vacuum (UHV) apparatus allowed the surfaces to be reacted at environmentally relevant pressures and studied with X-ray photoelectron spectroscopy (XPS) without exposure to the atmosphere. Neither surface exhibited significant reaction in pure O 2 . Exposure of FeS 2 (111) to H 2 O vapor resulted in significant oxidation, but under these same experimental conditions FeS 2 (100) exhibited a much smaller amount of oxidation. It is suspected that on FeS 2 (100), H 2 O only reacted on nonstoichiometric regions (i.e., defects). Both surfaces showed substantial reaction in H 2 O/O 2 . The amount of FeS 2 (100) and FeS 2 (111) oxidation in the H 2 O/O 2 mixture was more than simply the sum of the reaction observed individually in pure O 2 and H 2 O. This result suggests that there is a synergy between H 2 O and O 2 in oxidizing pyrite. In all cases, the amount of oxidation that occurred on FeS 2 (111) was greater than on FeS 2 (100). We believe that this experimental observation is due to a higher concentration of under-coordinated Fe in the outermost surface of FeS 2 (111), relative to FeS 2 (100). You do not have access to this content, please speak to your institutional administrator if you feel you should have access.