The nanocrystalline was prepared by a poly(vinyl alcohol) -assist combustion method. The results of x-ray diffraction indicate that the resulting nanocrystals have much broader and less intense peaks compared with those in bulk material. The charge-transfer bands in nanocrystals shift to higher energies in contrast to those in bulk material. The spectral results revealed that in bulk , the ions occupied three nonequivalent sites, with one at the Sr site: one at the Y(1) site and another at the Y(2) site, while in nanocrystalline , the ions occupied only two nonequivalent sites; one at the Y(1) site and the other at the Y(2) site. Finally, by theoretical calculation and analysis, the analyzed results are in reasonable agreement with our experimental results.
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