LIME Research Activities

The approach built in the lab aims to establish and understand the correlations between the microstructure of a solid and its capability to be altered. The final goal is then to be able to predict and/or control the physico-chemical parameters responsible for the increase (or the decrease) of the dissolution rate.
In this aim, the studies need to develop a transverse approach combining the mastering of elaboration and sintering steps of model compounds (e.g. Th1-xUxO2 or Th1-xPuxO2 solid solutions) which should integrate the recent progress in soft chemistry processes, particularly through the precipitation of crystallized precursors (direct precipitation, hydrothermal or microwave syntheses, …).

The understanding of dissolution mechanisms occurring at the solid/liquid interface constitutes the second part of this work. Theories of dissolution, generally applied to geochemical considerations, are mostly based on the existence of activated complex. They were recently extended to ceramic materials in the frame of the NOMADE network, dedicated to specific radwaste matrices for long live radionuclides. It could be split into two correlated approaches:

  • First one, focused on kinetics, will describe elementary transfers from solid to solution
  • The second, dedicated to thermodynamics, will aim to understand the processes controlling the concentration of elements in solution, particularly through the formation of new solids onto the surface of the leached samples at both nano-, meso- and micrometric scales.