Dielectric Spectroscopy of SrTiO3 Ceramics in Wide Frequency Range
钛酸锶的宽频带介电谱

By using computer controlled ultra-low frequency dielectric spectrometer and HP4124A impendence analyzer, we measured the frequency domain dielectric spectrum of SrTiO3 ceramics in the frequencies from 10-4Hz to 105Hz. The complex dielectric constants obtained can be well extracted into the summation of two components. The lower frequency one can probably attribute to the motion of space charges in grain boundaries, the higher frequency one can attribute to that within the grains. Further, real permittivity of the latter component changes to be below zero at high frequencies. It indicates that frequency domain method is not a proper method for describing dielectric spectroscopy, while the experimental results can not be explained by traditional dielectric polarization theory.