以<001>取向的PMN-0.14PT,PMN-0.17PT,PMN-0.28PT为代表,研究了PT含量对PMN-xPT单晶电卡效应的影响.通过测试单晶的变温电滞回线,计算了PMN-0.14PT,PMN-0.17PT,PMN-0.28PT的电卡效应.计算结果显示PMN-0.14PT,PMN-0.17PT,PMN-0.28PT单晶的电卡效应最大值随着PT含量的增加而增加,在较小的4 kV/mm电场情况下,分别达到1K,1.17K,1.96 K.此外,电卡效应峰发生在居里温度介电峰附近,随着PT含量的增加,电卡效应峰越来越尖锐并移向高温方向.
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