@@ 1 Introduction Ceria takes a key role in catalytic converters for automotive applications due to its inherent oxygen buffering ability. The efficiency of oxygen uptake/release process strongly depends on oxygen diffusion steps [1]. The oxygen mobility in doped ceria have received attention due to its possible applications as the anode material within solid oxide fuel cells (SOFCs) [2]. Moreover, the transport of oxygen ions is crucial to catalytic partial oxidation of methane [3]. The motivation of this work is to explore the mechanism of enhanced oxygen migration process of Ce0.97Ni0.03O1.97 solid solution in which the Ni atoms are dispersed in bulk ceria as substitutional point defects.