The calculation of activation parameter and the dependence of peaks P1 and P2 on Bi2O3 excess indicated that the relaxation mechanism of P1 and P2 are related to stoichiometric vacancies of strontium-titanium.

• 通过激活参数的计算以及损耗峰随不同Bi过量的变化；可以确定P1；P2峰的弛豫机制与Sr；Ti空位有关.