Powellite-Rich Glass-Ceramics: A Spectroscopic Study by EPR and Raman Spectroscopy

T Taurines (1) , Delphine D. Neff (2, 3) , B Boizot (1)

1 LSI - Laboratoire des Solides Irradiés
2 LAPA - UMR 3685 - Laboratoire Archéomatériaux et Prévision de l'Altération
3 IRAMAT - Institut de Recherches sur les Archéomatériaux

The aim of this study is to better understand the incorporation of rare earth elements in glass-ceramics of nuclear interest. We synthesized glass-ceramics from glasses in the system SiO 2-B 2 O 3-Na 2 O-CaO-Al 2 O 3-MoO 3-Gd 2 O 3 by various heat treatments. Gadolinium is used both as a spectroscopic probe and as a minor actinide surrogate. Glass-ceramics contain only one crystalline phase in the bulk: powellite (CaMoO 4). This phase can incorporate Gd 3+ and Na + ions by substitutions on the Ca site. We demonstrated that the charge compensation by Na + favors the rare earth elements incorporation. Moreover, the incorporated elements do not seem to be randomly distributed into the powellite structure.

Domains: Material chemistry

T Taurines, Delphine D. Neff, B Boizot. Powellite-Rich Glass-Ceramics: A Spectroscopic Study by EPR and Raman Spectroscopy. Journal of the American Ceramic Society, 2013, pp.1-7. ⟨10.1111/jace.12401⟩. ⟨cea-01120956⟩