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Nature of arsenic sites in arsenian pyrite- A synchrotron radiation X-ray photoelectron spectroscopy (SRXPS) study

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dc.contributor.authorForson, P.
dc.contributor.authorKrasowska, M.
dc.contributor.authorCowie, B.
dc.contributor.authorSkinner, W.
dc.date.issued2022
dc.description.abstractThe observed spatial variability of arsenic substituted in pyrite (arsenian pyrite) was considered to study the nature of arsenic environment using synchrotron X-ray photoelectron spectroscopy. As 3d of arsenian pyrite has shown that bulk As, present as As(-I) in arsenian pyrite, may be an As–As dimer rather than as As–S. This argument was made due to shift in the bulk As 3d component to lower binding energy, a feature observed in the As-As dimer of loellingite (FeAs₂). The presence of a pronounced tail in the Fe 2p signal of arsenian pyrite, which is absent in loellingite, implies localised arsenic mineralisation in a dominating pyrite host. Possible As cluster formation producing a subtle shift in binding energy to lower values is also put forward. The surface component found at a binding energy of 41.3 eV in the As 3d of arsenian pyrite was ascribed to polymeric sites generated from surface reconstruction initiated upon fracture of As–As or As–S bond. Except for a polymeric sulphur component at a binding energy of 163.2 eV, the S 2p signal of pyrite and arsenian pyrite are equivalent at high excitation energy.
dc.identifier.citationVacuum, 2022; 202(article no. 111151)
dc.identifier.doi10.1016/j.vacuum.2022.111151
dc.identifier.issn0042-207X
dc.identifier.issn1879-2715
dc.identifier.orcidKrasowska, M. [0000-0003-0309-1772]
dc.identifier.orcidSkinner, W. [0000-0002-9606-023X]
dc.identifier.urihttps://hdl.handle.net/11541.2/28922
dc.language.isoen
dc.publisherPERGAMON-ELSEVIER SCIENCE LTD
dc.rightsCopyright 2022 Elsevier
dc.source.urihttps://doi.org/10.1016/j.vacuum.2022.111151
dc.subjectarsenian pyrite
dc.subjectpolymerisation
dc.subjectcluster formation
dc.subjectsynchrotron
dc.subjectreconstruction
dc.titleNature of arsenic sites in arsenian pyrite- A synchrotron radiation X-ray photoelectron spectroscopy (SRXPS) study
dc.typeJournal article
pubs.publication-statusPublished
ror.fileinfo12245399850001831 13245399840001831 Open Access Postprint
ror.mmsid9916640689501831

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