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SUMMARY:Synchrotron Light for Exploring Arsenic Environments in Arsenian P
 yrite
DTSTART;VALUE=DATE-TIME:20211125T070400Z
DTEND;VALUE=DATE-TIME:20211125T070500Z
DTSTAMP;VALUE=DATE-TIME:20260310T123523Z
UID:indico-contribution-4223@events01.synchrotron.org.au
DESCRIPTION:Speakers: Philip Forson (University of South Australia\, Futur
 e Industries Institute-STEM)\nSubstitution of arsenic in pyrite called ars
 enian pyrite is often accompanied by concentration of valuable metals such
  as gold in some deposits. In such mineralogical occurrence\, a concentrat
 ion-driven substitution of As encapsulating ‘pure’ pyrite is typical. 
 Although knowledge of As substitution environment in pyrite is important i
 n determining surface characteristics\, and interactions in chemical proce
 sses such as oxidation\, they are widely varied in nature with paucity of 
 information in existing literature. The current study employed synchrotron
  X-ray spectroscopy (SXPS)\, using tunable excitation energy to study vacu
 um-fractured surfaces of arsenian pyrite.  SXPS As 3d of arsenian pyrite s
 uggest the existence of an As-As dimer in arsenian pyrite\, characterised 
 by a shift in bulk binding energy to 0.6 eV lower than the As-S dimer of a
 rsenopyrite. Possible As cluster formation was also proposed. The high bin
 ding energy contribution at excitation energy of 100 and 210 eV were resol
 ved into two surface components that may have formed from possible surface
  reconstruction or polymerisation.\n\nhttps://events01.synchrotron.org.au/
 event/146/contributions/4223/
LOCATION:Online
URL:https://events01.synchrotron.org.au/event/146/contributions/4223/
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