测量了各样品在lkHz、10kHz、100kHz频率下从室温至500℃的介电温谱，表明材料为弛豫铁电体．Ba^2＋掺入使其弛豫特性有所降低。当x≥0．10时，材料在低温下具有正常铁电体的特征．高温下具有弛豫铁电体的特征。两个介电反常峰的存在表明在此温度区间材料发生了两次相交。%The temperature dependence of dielectric constant between room temperature and 500℃ under lkHz,10kHz,100kHz frequency conditions were measured, it is found that the ceramics are relaxor ferroelectric. The relaxor characteristics are decreased by the substitution of Ba2＋. The ceramics exhibit normal ferroelectric properties at low temperature and relaxation properties at high temperature with the composition of x≥0.10. It can be concluded that there are two phase transitions take place in the heating process by the phenomenon of two abnormal dielectric peaks.
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