Near-surface Regions of Electrochemically Polarized Chalcopyrite (CuFeS2) as Studied Using XPS and XANES : доклад, тезисы доклада

Тип публикации: доклад, тезисы доклада, статья из сборника материалов конференций

Конференция: International Conference on Synchrotron and Free Electron Laser Radiation: Generation and Application, SFR 2016; Novosibirsk; Novosibirsk

Год издания: 2016

Идентификатор DOI: 10.1016/j.phpro.2016.11.067

Ключевые слова: chalcopyrite, electrochemistry, non-stoichiometric surface layer, oxidation, reactivity, Xanes, Xps

Аннотация: Characteristics of the non-stoichiometric near-surface layers formed at reacted chalcopyrite are important for understanding its behavior as the main mineral of copper and for various materials applications. Here, we measured Cu L-, Fe L-, and S L-edge TEY XANES, and conventional XPS from chalcopyrite electrochemically polarized in 1 M HCl solution. The spectra of copper, in contrast to those of Fe and S, remain almost unchanged on the first potential cycle despite strongly varying composition of the Fe-depleted near-surface regions. The Cu L-XANES spectra of chalcopyrite electrochemically pre-reduced and then anodized, and of that first anodized and then cathodically reduced, show the same leading peak but post-edge features indicative of covellite CuS and bornite Cu5FeS4, respectively. We suggest that the invariability of the Cu L-edge XANES and Cu 2p spectra is due to tetrahedral coordination CuS4 units stable even in the highly distorted non-stoichiometric structures.

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Издание

Журнал: Physics Procedia

Выпуск журнала: 84

Номера страниц: 390-396

Издатель: Elsevier B.V.

Авторы

  • Mikhlin Y. (Institute of Chemistry and Chemical Technology,Siberian Branch,Russian Academy of Sciences)
  • Romanchenko A. (Institute of Chemistry and Chemical Technology,Siberian Branch,Russian Academy of Sciences)
  • Tomashevich Y. (Institute of Chemistry and Chemical Technology,Siberian Branch,Russian Academy of Sciences)
  • Shurupov V. (Institute of Chemistry and Chemical Technology,Siberian Branch,Russian Academy of Sciences)

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