[A Raman study of ZnO powders with ZnO2 as precursor]

Raman spectra of ZnO powders prepared by firing ZnO2 precipitate were reported in detail for the first time. By comparing the spectra with that of the sample fabricated by another method and analyzing frequency difference between the focused-laser irradiated samples with different firing temperature in preparation, it was concluded that the -333 cm(-1) peak is ascribed to E2 (high)-E2 (low) and the -661 cm(-1) peak to its overtone. In addition, a new interpretation for the observed Raman peaks between 400 and 500 cm(-1) in ZnO2 powders was presented based on the IR data and ab initio calculation.