The ceramic Sr x Ba 1- x TiO 3 samples are prepared with their formulation by solid reaction method and they show remarkable diffuse phase transform at x =0 30. The frequency domain method is applied to measure the spectra covering the range 5 Hz￣1 MHz. The real component ε′ and the imaginary component ε″ of relative dielectric constant are found to increase with the decrease of the measurement frequency. The 1/ε′ dependence of lg f is observed to be in two different slope line segments. The measurement points (ε′

ε″) as a function of frequency f plotted in the complex plane are in lines

showing the ε″(ω)=g[ε′(ω)-ε′ h] relationship.