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American Mineralogist; July 2004; v. 89; no. 7; p. 1026-1032
© 2004 Mineralogical Society of America
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Sulfur species at chalcopyrite (CuFeS2) fracture surfaces

Sarah L. Harmer1,*, Allen R. Pratt2, Wayne H. Nesbitt1 and Michal E. Fleet1

1 Department of Earth Sciences, University of Western Ontario, London, Ontario, N6A 5B7 Canada
2 CANMET Mining and Mineral Sciences Laboratories, 555 Booth Street Ottawa, Ontario, K1A 0G1 Canada

Correspondence: * E-mail: sharmerb{at}uwo.ca

Pristine fractured surfaces of chalcopyrite (CuFeS2) have been studied using Synchrotron Radiation X-ray Photoelectron Spectroscopy and conventional X-ray Photoelectron Spectroscopy. These high-resolution spectra reveal for the first time three distinct contributions to the S 2p spectrum. The main symmetric peak is located at 161.33 eV and is likely derived from fully coordinated bulk S atoms. A core-level shifted peak was observed at 160.84 eV and is attributed to surface monomeric species (S2–). A second broad contribution at 161.88 eV likely represents surface polymeric species (). The data suggest that surface polymers form where S-terminated surfaces such as the () plane are exposed during fracture.




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