Nano SnO 2 powders were prepared by sol gel technology Raman spectra of nano SnO 2 with different crystalline diameter (3￣15 nm) were obtained

and the hyperfine parameters of interface phase and crystalline phase were determined by Mssbauer spectra Effects of oxygen deficiencies on Raman spectra of samples annealed in oxygen and vacuum respectively were measured and explained by the variation of hyperfine parameters