High-resolution structural study of zinc ion incorporation at the calcite cleavage surface

L. Cheng, N. C. Sturchio*, J. C. Woicik, K. M. Kemner, P. F. Lyman, M. J. Bedzyk

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

The atomic-scale structure of Zn2+ incorporated at the CaCO3 (1014) surface by adsorption from solution was determined by X-ray standing wave triangulation and surface extended X-ray absorption fine structure spectroscopy. At low coverage (approximately 0.1 ML), Zn2+ substitutes for Ca2+ in the surface layer. Structural relaxation of the adjacent in-plane CO2-3 ions in the host surface is shown by the reduced nearest-neighbor distance of Zn-O relative to Ca-O. Relaxation of the Zn2+ ion in the out-of-plane direction is shown by the displacement of its lattice position from the ideal Ca2+ position. These relaxations, resulting in a local lattice buckling feature at the Zn2+ adsorption site, can be fully explained as the combined effect of the electrostatic relaxation of the nearest-neighbor anions in response to the smaller size of Zn2+, and the bonding asymmetry due to surface truncation.

Original languageEnglish (US)
Pages (from-to)L976-L982
JournalSurface Science
Volume415
Issue number1-2
DOIs
StatePublished - Sep 30 1998

Keywords

  • Adsorption
  • Calcite
  • Surface extended X-ray absorption fine structure (SEXAFS)
  • Surface structure
  • X-ray standing waves (XSW)
  • Zinc

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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