Bi_1-x(Sr_0·5Pb_0.5)_xFeO₃ with x = 0.1 and 0.3 were synthesized by solid-state reaction method. The dielectric properties of the samples have been investigated in the temperature range from −100 to 300 °C. The colossal dielectric constant (CDC) behavior was observed in temperature range from 50 to 200 °C and frequency range from 10² Hz to 10³ Hz. The CDC behavior is composed of two relaxation processes with the lower temperature relaxation being a dipolar relaxation caused by the hopping of oxygen vacancies and the higher temperature one being a Maxwell-Wagner relaxation caused by hopping oxygen vacancies blocked by grain boundaries. In the temperature range beyond 200 °C, a ferroelectric-phase-transition-induced dielectric anomaly with an extremely huge intensity over 10⁶ was observed in both samples. (Sr, Pb) co-doping in the place of Bi significantly shift the Curie temperature towards a low temperature of 263 and 243 °C for the samples with x = 0.1 and 0.3, respectively.

毕_{1- X}的（Sr _0·5的Pb _0.5）_X的FeO ₃与X  = 0.1和0.3，通过固相反应法合成。已在-100至300°C的温度范围内研究了样品的介电性能。在50至200°C的温度范围和10 ²  Hz至10 ^3的频率范围内观察到巨大的介电常数（CDC）行为 赫兹。CDC行为由两个弛豫过程组成，较低的温度弛豫是由氧空位的跃迁引起的偶极弛豫，而较高的温度是由跃迁的氧空位被晶界阻塞引起的麦克斯韦-瓦格纳弛豫。在超过200°C的温度范围内，在两个样品中都观察到铁电相变引起的介电异常，强度异常超过1​​0 ⁶。（Sr，Pb）共掺杂代替Bi分别将x = 0.1和0.3的样品的居里温度移向263和243°C的低温。