Powellite‐Rich Glass‐Ceramics: A Spectroscopic Study by EPR and Raman Spectroscopy |
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Authors: | Tatiana Taurines Delphine Neff Bruno Boizot |
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Affiliation: | 1. Laboratoire des Solides Irradiés, UMR 7642 CEA‐CNRS‐Ecole Polytechnique, , Palaiseau, 91128 France;2. Service Interdisciplinaire sur les Systèmes Moléculaires et les Matériaux, UMR 3299 CEA‐CNRS, , Gif sur Yvette, 91190 France |
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Abstract: | The aim of this study was to better understand the incorporation of rare‐earth elements in glass‐ceramics of nuclear interest. We synthesized glass‐ceramics from glasses in the system SiO2–B2O3–Na2O–CaO–Al2O3–MoO3–Gd2O3 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 (CaMoO4). This phase can incorporate Gd3+ and Na+ ions by substitutions on the Ca site. We demonstrated that the charge compensation by Na+ favors the incorporation of rare‐earth elements. Moreover, the incorporated elements do not seem to be randomly distributed into the powellite structure. |
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