The measurement of hysteresis loops show that with the grain size decreasing, remnant polarization (Pr) deceases and coercive electric field (Ec) increases.

• 通过电滞回线的测试发现，随着晶粒尺寸的减小，样品剩余极化强度Pr表现出减小的趋势，矫顽场强Ec表现出增加的趋势。