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

Abstract : 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.
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Submitted on : Friday, February 27, 2015 - 9:53:07 AM
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T Taurines, D Neff, B Boizot. Powellite-Rich Glass-Ceramics: A Spectroscopic Study by EPR and Raman Spectroscopy. Journal of the American Ceramic Society, Wiley, 2013, pp.1-7. ⟨10.1111/jace.12401⟩. ⟨cea-01120956⟩

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