Abstract
The sequence of precipitation in five different alkali-borosilicate glasses is studied by HREM, HAADF-STEM and EELS. The glasses are doped or supersaturated with 4 mol% of CeO2, and have varying concentrations of other dopant oxides, such as Fe2O3, Nd2O3, Cr2O3, and Ag2O. The shape and distribution of precipitates range from amorphous droplet shape to dendritic crystals. Oxidation states of Ce and other cations in glass and precipitates are measured by ELNES. It is found that Ce in glass preferentially adopts +IV valence in Ce-crystal-free glasses while it adopts +III valence in glass nanocomposites that contain Ce(+IV)O2 nanocrystals.
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