Electronic environments in Ni3Pb2S2 (shandite) and its initial oxidation in air

William Skinner, Gujie Qian, Alan Buckley

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Polycrystalline Ni3Pb2S2 (shandite) was synthesised as a non-porous ingot to enable representative surfaces prepared by fracture under UHV to be characterised by X-ray photoelectron spectroscopy (XPS) before and after exposure to air. For an unoxidised surface, the S 2p 3/2 binding energy was found to be significantly lower than those reported previously for shandite itself and other sulfides having shandite structure, and consistent with the physical and chemical properties of the shandites. The core electron binding energies for the three constituent elements were in agreement with the formal oxidation state representation Ni 0 3PbII 2S-II 2, analogous to that deduced previously for Ni3Sn2S 2. Shandite surfaces were found to oxidise rapidly when initially exposed to air under ambient conditions, and concomitant with the formation of the Ni-O and Pb-O species, to restructure to NiS- and PbS-like surface phases having S core electron binding energies no higher than those for shandite.

Original languageEnglish
Pages (from-to)32-37
Number of pages6
JournalJournal of Solid State Chemistry
Volume206
DOIs
Publication statusPublished - Oct 2013
Externally publishedYes

Keywords

  • Shandite
  • X-ray photoelectron spectroscopy
  • Metal-rich sulfide
  • Valence state

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