【摘要】 用固相反应法制备ＳｒｘＢａ１－ｘＴｉＯ３系列陶瓷．当ｘ＝０．３０时呈现显著的驰豫相变特征．在５Ｈｚ至１ＭＨｚ范围，相对介电常数的实部ε′随频率ｆ的降低而增大．１／ε′与ｌｇｆ的关系曲线呈现折曲的２段直线．高频相对介电常数的实部ε′ｈ随ｘ的增加而增大是与顺电相的增加而对应．测量点（ε′，ε″）随频率ｆ的变化分布在复平面的一条直线上．更多还原

【Abstract】 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.更多还原