Volume interdiffusion coefficient and uncertainty assessment for polycrystalline materials

Jacques Lechelle (1) , S. Noyau (2) , L. Aufore (1) , A. Arredondo (1) , F. Audubert (3)

1 LMPC - Laboratoire d'étude des Microstructures et des Propriétés des Combustibles
2 SPCTS-AXE1 - Axe 1 : procédés céramiques
3 LTEC - Laboratoire des Technologies d'Elaboration des Combustibles

A method has been developed in order to assess small volume interdi ffusion coeffi cients from experimental Electron Probe MicroAnalysis concentration profi les of polycrystalline materials by means of Boltzmann-Matano or den Broeder methods and their complementary Hall method. These methods have been used as tools for the investigation of the quasi-binary UO2/U(1-y)PuyO(2-z) interdi ffusion, for which obtaining a solid solution in the bulk of grains is of major interest. In this paper uncertainties on the interdiff usion coefficient as a function of concentration have been computed for each method. Small volume coeffi cient measurements were enhanced by means of a small angle acquisition pro le line with respect to the interdiff usion interface.

Keywords: interdi usion; volume di usion; Boltzmann-Matano; Hall; den Broeder; uncertainty

Domains: Chemical Sciences; Material chemistry

Jacques Lechelle, S. Noyau, L. Aufore, A. Arredondo, F. Audubert. Volume interdiffusion coefficient and uncertainty assessment for polycrystalline materials. Diffusion Fundamentals, 2012, 17 (2), pp.1-39. ⟨cea-01064438⟩