Conditions Extrêmes et Matériaux : Haute Température et Irradiation

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P.Simon, A.Canizares, N.Raimboux and L.Desgranges, 'How can Raman spectroscopy be used to study nuclear fuel?', Materials Research Society Bulletin 48 118-123 (2023) doi:10.1557/s43577-022-00371-w

Raman spectroscopy was recently used to characterize irradiated, doped, or implanted UO2. In all cases, the Raman spectrum evidenced three additional peaks, called defect peaks, whose interpretation is still under debate. Here, we evidence that defect peaks are Raman resonant peaks with different resonance energy using Raman multiwavelength analysis of He-irradiated UO2. Moreover, we demonstrate by phonon calculations that they correspond to a local symmetry, in which at least F-centering is lost. These findings provide a new framework for the interpretation of the Raman spectrum of modified compounds having initial fluorite structure.