Zinc environment in aluminoborosilicate glasses by Zn K-edge EXAFS spectroscopy.

M. Le-Grand (1, 2) , A.-Y. Ramos (1, 3) , G. Calas (1) , L. Galoisy (1) , D. Ghaleb (2) , F. Pacaud (2)

1 IMPMC - Institut de minéralogie et de physique des milieux condensés
2 CEA/DCC/DRRV/SCD, Commissariat à l'Energie Atomique, Marcoule
3 LNLS - Laboratório Nacional de Luz Sìncrotron

The structural surrounding of Zn in inactive nuclear glasses was determined using extended x-ray absorption fine structure spectroscopy. Zn was found in tetrahedral coordination ([4]Zn) with [4]Zn-O distances of 1.95 Å. ZnO4 tetrahedra shared corners with SiO4 tetrahedra [d(Zn-Si) around 3.20 Å]. The oxygens of the Zn-O-Si bonds were charge compensated by Na+ and, to a minor extent, by Cs+. The influence of [4]Zn on the formation of charge-compensating cations at the expense of network modifiers may explain the stabilizing effect of Zn in these glasses.

M. Le-Grand, A.-Y. Ramos, G. Calas, L. Galoisy, D. Ghaleb, et al.. Zinc environment in aluminoborosilicate glasses by Zn K-edge EXAFS spectroscopy.. Journal of Materials Research, 2000, 15, pp.2015-2019. ⟨hal-00085676⟩