author={Jonathan E. Spanier and Richard D. Robinson and Fu Zheng},
The combined effects of strain and phonon confinement are seen to explain why the Raman peak near 464 cm - 1 in CeO 2 - y nanoparticles shifts to progressively lower energies and the lineshape of this feature gets progressively broader and asymmetric (on the low-energy side) as the particle size gets smaller. The increasing lattice constant measured for decreasing particle size explains this Raman shift well. The linewidth change is fairly well explained by the inhomogenous strain broadening… 

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