采用溶胶-凝胶方法制备了（Ba0.97Ca0.03）（Ti0.82Zr0.18）O3无铅压电陶瓷。在电场1～8kV/cm下,频率为0.01～10Hz范围内,对其电滞回线进行了分析。实验结果表明（Ba0.97Ca0.03）（Ti0.82Zr0.18）O3陶瓷的电滞回线随电场值和频率的变化明显,在低电场下,随着频率的增加矫顽场（Ec）单调减小,在低频下剩余极化（Pr）增加;而在高电场下,随着频率的增加Ec单调增大,电滞回线达到饱和时,电滞回线随不同测试频率无明显变化。
The（Ba0.97Ca0.03）（Ti0.82Zr0.18）O3 ceramics were prepared by sol-gel technique.The evolution of the ferroelectric hysteresis loops was analyzed at frequencies ranging from 0.01 to 10Hz and in a field of 1-8kV/cm.The results showed that the electric field and frequency dependence of hysteresis loops were obvious.At low field,coercive field（Ec） decreased monotonically with frequency increasing,and remanent polarization increased at low frequency.But at high field,Ec increased monotonically with frequency increasing,and the evolution of the hysteresis loops is not obvious with different testing frequency when the hysteresis loops become saturated.
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