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Surface optical phonons (SOP) were observed in the range of 496–572cm −1 on Raman scattering spectra of nanocrystalline samples of ZnO(Co) prepared by use of the microwave assisted hydrothermal synthesis and traditional wet chemistry method followed by calcinations. The phase composition of the samples (ZnO, Co 3 O 4 , ZnCo 2 O 4 ) and the mean crystalline size...
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