【摘要】 用硬酯酸凝胶法制成粒度均匀的 Sr Ti O3纳米晶 ,用 X射线衍射光谱和红外光谱对产物进行表征。通过对所制材料复阻抗的测定 ,总结出与之相应的等效电路。实验结果表明 ,随着纳米晶 Sr Ti O3粒径的增大 ,其复阻抗谱由阻挡层串联型变为德拜型更多还原

【Abstract】 Appropriate amount of stearic acid and Sr(OH) 2·8H 2O were melted, into which tetrabutyl titanate was added while stirring. Then the solution was cooled in cool water to form a gel. Nanocrystalline SrTiO 3 powder with even grain size were obtained by calcining the gel at different temperature. The products were characterized by X ray powder diffraction and Infrared spectrum. Equivalent circuits of double impedance of the nanocrystal were generalized. The results of experiments show that the double impedance spectra change from a half circle which is warped at low frequency to a oblique line with the increasing of the measuring frequency as the grain size increases. Their equivalent circuits change from barrier layer series type to Debye type.更多还原