Electron Spin Resonance and Atomic Force Microscopy study on Gadolinium doped Ceria

A combined electron spin resonance (ESR) and atomic force microscopy (AFM) study on Ce1-xGdxO2-x/2 samples is here presented, aimed at investigating the evolution of the ESR spectral shape as a function of in a wide composition range. At low , the spectrum is composed of features at ; 2.8; 6. With increasing , this pattern merges into a single broad ESR curve, which assumes a Dysonian-shaped profile at , whereas, at these values, AFM measurements show an increasing surface roughness. It is suggested that the last could cause the formation of surface polaritons at the origin of the particular ESR spectral profile observed at these high Gd doping levels.