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Nucleation and growth of crystal in an oxide glass was studied in a Si B AlZr Nd Ca Na O system. The nucleation and growth process was monitored bythermal analysis and isothermal experiments. For the Ca sample thecrystallization is homogeneous in the bulk showing a slow increase ofcrystallinity as temperature increases. The Na rich sample on the other hand gothrough several crystallization process in the bulk or from the surface,leading to bigger crystals. The activation energy of the viscous flow and theglass transition are of same magnitude when that of crystallization is a lotsmaller. Early diffusion of element is done with a mechanism different than theconfigurational rearrangements of the liquid sate. The global density and smallshape of the crystals within the Ca rich matrix confirmed that it would be aprofitable waste form for minor actinides.

Control of nucleation and crystal growth of a silicate apatitic phase in a glassy matrix