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Letter. Determination of the oxidation state of Cu in substituted Cu-In-Fe-bearing sphalerite via μ-XANES spectroscopy

  • Nigel J. Cook EMAIL logo , Cristiana L. Ciobanu , Joël Brugger , Barbara Etschmann , Daryl L. Howard , Martin D. de Jonge , Chris Ryan and David Paterson
Published/Copyright: April 2, 2015
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American Mineralogist
From the journal American Mineralogist Volume 97 Issue 2-3

Abstract

In situ spatially resolved X-ray absorption near edge structure (m-XANES) spectra are obtained for natural Cu-In-bearing sphalerite. Copper K-edge spectral data show that, in Cu-In-bearing sphalerite, in which an excellent correlation between the Cu and In contents is noted, Cu is present in the Cu+ state. This offers indirect proof for the coupled substitution 2 Zn2+ ↔ Cu+ + In3+, which allows indium to enter the sphalerite structure. The study clearly demonstrates the utility of synchrotron radiation to accurately determine oxidation state in small volumes of mineral in which the concentration of the element of interest is low or very low. The study also demonstrates that good quality μ-XANES spectra can be collected on TEM foils prepared in situ at a chosen position on the surface of a polished sample using the focused ion beam-scanning electron microscope method.

Keywords : Sphalerite; XANES; copper substitution; oxidation state
Received: 2011-11-10
Accepted: 2011-12-1
Published Online: 2015-4-2
Published in Print: 2012-2-1

© 2015 by Walter de Gruyter Berlin/Boston

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  25. Letter. Determination of the oxidation state of Cu in substituted Cu-In-Fe-bearing sphalerite via μ-XANES spectroscopy
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https://doi.org/10.2138/am.2012.4042
Keywords for this article
Sphalerite; XANES; copper substitution; oxidation state

Articles in the same Issue

  1. Redetermination of the structure of 5C pyrrhotite at low temperature and at room temperature
  2. Thermal elastic behavior of CaSiO3-walstromite: A powder X-ray diffraction study up to 900 °C
  3. Magnesiohögbomite-2N4S: A new polysome from the central Sør Rondane Mountains, East Antarctica
  4. Hanjiangite, a new barium-vanadium phyllosilicate carbonate mineral from the Shiti barium deposit in the Dabashan region, China
  5. Combined neutron and X-ray diffraction determination of disorder in doped zirconolite-2M
  6. Focused ion beam preparation and characterization of single-crystal samples for high-pressure experiments in the diamond-anvil cell
  7. Phase stability and elastic properties of the NAL and CF phases in the NaMg2Al5SiO12 system from first principles
  8. Redistribution of REE, Y, Th, and U at high pressure: Allanite-forming reactions in impure meta-quartzites (Sesia Zone, Western Italian Alps)
  9. MAS NMR measurements and ab initio calculations of the 29Si chemical shifts in dumortierite and holtite
  10. Aluminum ordering and clustering in Al-rich synthetic phlogopite: {1H} → 29Si CPMAS HETCOR spectroscopy and atomistic calculations
  11. Cell assemblies for reproducible multi-anvil experiments (the COMPRES assemblies)
  12. Recrystallization rims in zircon (Valle d’Arbedo, Switzerland): An integrated cathodoluminescence, LA-ICP-MS, SHRIMP, and TEM study
  13. Temperature and humidity effects on ferric sulfate stability and phase transformation
  14. Unraveling complex <2 μm clay mineralogy from soils using X-ray diffraction profile modeling on particle-size sub-fractions: Implications for soil pedogenesis and reactivity
  15. Variations in elastic and anelastic properties of Co3O4 due to magnetic and spin-state transitions
  16. High-pressure behavior of space group P2/n omphacite
  17. Twinning in pyromorphite: The first documented occurrence of twinning by merohedry in the apatite supergroup
  18. Spectroscopic characterization of alkali-metal exchanged natrolites
  19. Coupled (Li+, Al3+) substitutions in hydrous forsterite
  20. Crystal chemistry of trioctahedral micas-2M1 from Bunyaruguru kamafugite (southwest Uganda)
  21. Menchettiite, AgPb2.40Mn1.60Sb3As2S12, a new sulfosalt belonging to the lillianite series from the Uchucchacua polymetallic deposit, Lima Department, Peru
  22. Adolfpateraite, K(UO2)(SO4)(OH)(H2O), a new uranyl sulphate mineral from Jáchymov, Czech Republic
  23. Amorphous materials: Properties, structure, and durability
  24. Amorphous materials: Properties, structure, and durability
  25. Letter. Determination of the oxidation state of Cu in substituted Cu-In-Fe-bearing sphalerite via μ-XANES spectroscopy
  26. Letter. Morphological quantification of hierarchical geomaterials by X-ray nano-CT bridges the gap from nano to micro length scales
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