GEOC 125 |
| Caterina E. Tommaseo1, Alain Manceau2, Bruno Lanson2, and Garrison Sposito1. (1) Departement of ESPM, UC Berkeley, 235 Hilgard Hall, Berkeley, CA 94720-3110, (2) Environmental Geochemistry Group L.G.I.T, University J. Fourier, B.P. 53, Grenoble Cedex 9, 38041, France |
| The incorporation mechanism of nickel and zinc in lithiophorite and birnessite was studied at varying doping concentrations on synthetic samples to avoid the inherent complexity of natural samples. Structural characterization was performed using X-ray diffraction and EXAFS spectroscopy. The high quality of EXAFS spectra (up to 16 Å-1) allowed us to resolve interatomic distances down to 0.12 Å and to model and interpret quantitatively the contribution from multiple scattering effects. The likely crystallographic sites occupied by Zn and Ni will be discussed on the basis of these results. |
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Poster Session
6:00 PM-9:00 PM, Tuesday, March 30, 2004 Anaheim Convention Center -- Hall A, Poster
Division of Geochemistry |