Interplay between sub-mesoscale oxygen ordering and low-T oxygen mobility explored in situ in Pr2NiO4+d

The proposal aims to explore in situ the changes in the lattice dynamics during the electrochemical reduction of Pr2NiO4.25 showing sub-mesoscale oxygen ordering to Pr2NiO4.0. The study will enable to monitor the energy dependence of the soft mode behavior in Pr2NiO4+d with the charge transfer, i.e. the oxygen content, over the whole stoichiometry range. It will allow to conclude on the interplay between sub-mesoscale oxygen ordering and low-T oxygen mobility via a modified lattice dynamics in terms of a phonon assisted diffusion model.