Macroscopic rates, microscopic observations, and molecular models of the dissolution of carbonate phases.
- Harvard University, Cambridge, MA
Bulk and surface energies are calculated for endmembers of the isostructural rhombohedral carbonate mineral family, including Ca, Cd, Co, Fe, Mg, Mn, Ni, and Zn compositions. The calculations for the bulk agree with the densities, bond distances, bond angles, and lattice enthalpies reported in the literature. The calculated energies also correlate with measured dissolution rates: the lattice energies show a log-linear relationship to the macroscopic dissolution rates at circumneutral pH. Moreover, the energies of ion pairs translated along surface steps are calculated and found to predict experimentally observed microscopic step retreat velocities. Finally, pit formation excess energies decrease with increasing pit size, which is consistent with the nonlinear dissolution kinetics hypothesized for the initial stages of pit formation.
- Research Organization:
- Sandia National Laboratories
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 919119
- Report Number(s):
- SAND2004-1838
- Country of Publication:
- United States
- Language:
- English
Similar Records
Defect Distribution and Dissolution Morphologies on Low-Index Surfaces of alpha-Quartz
Dissolution of the periclase (001) surface: A scanning force microscope study