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A cerium (Ce) metal is an important rare earth element that is extremely reactive in air. The Ce surface chemistry can provide insight into actinides and is widely used in nuclear science. Nickel (Ni) is an inert metal with the potential to passivate the Ce surface. The surface and interface properties of a Ce metal with an ultrathin Ni film before and after air exposure have been studied. To prevent air exposure, in situ magnetron sputtering of Ce and Ni metal and surface analysis were carried out. Compared to the ex situ results, the in situ deposition of an Ni film improves the stability of both Ce and Ni. This work provides insight into the impact of the history of the oxidation process to Ce metal properties.

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