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Step edges on galena (100): Probing the basis for defect driven surface reactivity at the atomic scale

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Published/Copyright: March 26, 2015
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American Mineralogist
From the journal American Mineralogist Volume 86 Issue 7-8

Abstract

Scanning tunneling microscopy (STM) images of the PbS (100) surface with a step and several kinks were obtained with atomic resolution. These images show an increased tunneling current at step edge sites and an apparent deformation of the lattice near the step. The experimental images are compared with theoretical ab initio calculations for which we developed a hybrid method of constant current and constant height mode STM image simulation. With these calculations, we find that the apparent deformation is mainly an electronic effect rather than relaxation of atoms. In addition, with the help of these calculations, we can identify the changes of individual terrace-like and step-like orbitals that are observed using the STM in terms of the energy, density and shape of these states. This detailed knowledge of the electronic behavior of the PbS surface near a step can be used as a basis for explaining adsorption, acid/base, and redox behavior on PbS terraces and at steps, and the differences between the two.

Received: 2000-9-18
Accepted: 2001-2-25
Published Online: 2015-3-26
Published in Print: 2001-7-1

© 2015 by Walter de Gruyter Berlin/Boston

Articles in the same Issue

  1. Calcite inclusions in forsterite
  2. The induced thermoluminescence and thermal history of plagioclase feldspars
  3. Characterization and comparison of structural and compositional features of planetary quadrilateral pyroxenes by Raman spectroscopy
  4. A P21/c-C2/c high-pressure phase transition in Ca0.5Mg1.5Si2O6 clinopyroxene
  5. Energy-filtered transmission electron microscopy (EFTEM) of intergrown pyroxenes
  6. TEM analysis of microbial mediated sedimentation and lithification in modern marine stromatolites
  7. Mineralogy of a natural As-rich hydrous ferric oxide coprecipitate formed by mixing of hydrothermal fluid and seawater: Implications regarding surface complexation and color banding in ferrihydrite deposits
  8. A C/MoS2 mixed-layer phase (MoSC) occurring in metalliferous black shales from southern China, and new data on jordisite
  9. Step edges on galena (100): Probing the basis for defect driven surface reactivity at the atomic scale
  10. Solubility study of Ti,Zr-based ceramics designed to immobilize long-lived radionuclides
  11. Characterization of synthetic Cs-Li cancrinite grown in a butanediol-water system: An NMR spectroscopic and Rietveld refinement study
  12. Optical spectra of Co2+ in three synthetic silicate minerals
  13. Spectroscopic standards for four- and fivefold-coordinated Fe2+ in oxygen-based minerals
  14. Hydrous species in crystalline and metamict titanites
  15. First principles study of water adsorption on the (100) surface of zircon: Implications for zircon dissolution
  16. A molecular dynamics study of the glass transition in CaAl2Si2O8: Thermodynamics and tracer diffusion
  17. The crystal structure of aravaipaite
  18. Letter. Feldspar thermometry in ultrahigh-temperature metamorphic rocks: Evidence of crustal metamorphism attaining ~1100 °C in the Archean Napier Complex, East Antarctica
https://doi.org/10.2138/am-2001-0709

Articles in the same Issue

  1. Calcite inclusions in forsterite
  2. The induced thermoluminescence and thermal history of plagioclase feldspars
  3. Characterization and comparison of structural and compositional features of planetary quadrilateral pyroxenes by Raman spectroscopy
  4. A P21/c-C2/c high-pressure phase transition in Ca0.5Mg1.5Si2O6 clinopyroxene
  5. Energy-filtered transmission electron microscopy (EFTEM) of intergrown pyroxenes
  6. TEM analysis of microbial mediated sedimentation and lithification in modern marine stromatolites
  7. Mineralogy of a natural As-rich hydrous ferric oxide coprecipitate formed by mixing of hydrothermal fluid and seawater: Implications regarding surface complexation and color banding in ferrihydrite deposits
  8. A C/MoS2 mixed-layer phase (MoSC) occurring in metalliferous black shales from southern China, and new data on jordisite
  9. Step edges on galena (100): Probing the basis for defect driven surface reactivity at the atomic scale
  10. Solubility study of Ti,Zr-based ceramics designed to immobilize long-lived radionuclides
  11. Characterization of synthetic Cs-Li cancrinite grown in a butanediol-water system: An NMR spectroscopic and Rietveld refinement study
  12. Optical spectra of Co2+ in three synthetic silicate minerals
  13. Spectroscopic standards for four- and fivefold-coordinated Fe2+ in oxygen-based minerals
  14. Hydrous species in crystalline and metamict titanites
  15. First principles study of water adsorption on the (100) surface of zircon: Implications for zircon dissolution
  16. A molecular dynamics study of the glass transition in CaAl2Si2O8: Thermodynamics and tracer diffusion
  17. The crystal structure of aravaipaite
  18. Letter. Feldspar thermometry in ultrahigh-temperature metamorphic rocks: Evidence of crustal metamorphism attaining ~1100 °C in the Archean Napier Complex, East Antarctica
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