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1 Laboratoire des Verres and Céramiques, Institut de Chimie de Rennes, Université de Rennes 1, UMR-CNRS 6512, Campus Scientifique de Beaulieu, 35042 Rennes Cedex, France.
1 Laboratoire des Verres and Céramiques, Institut de Chimie de Rennes, Université de Rennes 1, UMR-CNRS 6512, Campus Scientifique de Beaulieu, 35042 Rennes Cedex, France.