High-Resolution Structural Study of Zinc Ion Incorporation at the Calcite Cleavage Surface

Published

October 12, 2021

Author(s)

L Cheng, N Sturchio, Joseph Woicik, K Kemner, P Lyman, Michael Bedzyk

Abstract

X-ray standing wave triangulation and surface extended X-ray absorption fine structure spectroscopy were used to determine the atomic-scale structure of the Zn²⁺ ion incorporated at the CaCO₃ (1014) surface by adsorption from solution. At about 10% coverage, Zn²⁺ substitutes for Ca²⁺ in the surface layer. Relaxation of the in-plane adjacent CO₃^2- ions is shown by the reduced Zn-O nearest-neighbor distance. Relaxation of the Zn²⁺ ion in the out-of-plane direction is indicated by the displacement of its lattice position from that of the ideal Ca²⁺. The electrostatic relaxation of the first nearest-neighbor anions and the bonding asymmetry due to surface truncation may fully account for the local buckling lattice structure at the impurity Zn²⁺ site of the CaCO₃ surface.

Citation

Surface Science

Volume

415

Issue

1-2

Pub Type

Journals

Keywords

adsorption, CaCO₃, calcite, low-index single crystal surfaces, surface structure, X-ray standing waves (XSW)

Citation

Cheng, L. , Sturchio, N. , Woicik, J. , Kemner, K. , Lyman, P. and Bedzyk, M. (2021), High-Resolution Structural Study of Zinc Ion Incorporation at the Calcite Cleavage Surface, Surface Science (Accessed October 14, 2024)