Coupled magnetic–electric properties and critical behavior in multiferroic particulate composites
Coupled magnetic–electric properties and critical behavior in multiferroic particulate composites
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DOI：
10.1063/1.1614866
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发表时间：
2003-10
影响因子：
3.2
通讯作者：
C. Nan;N. Cai;L. Liu;J. Zhai;Y. Ye;Y. Lin
中科院分区：
文献类型：
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作者：
C. Nan;N. Cai;L. Liu;J. Zhai;Y. Ye;Y. Lin
本文报道了一类由Tb-Dy-Fe合金、锆钛酸铅（PZT）和聚合物组成的多铁性三相颗粒复合材料的系统实验研究。在该复合材料中，少量体积分数f的Tb-Dy-Fe合金颗粒分散在PZT/聚合物混合物中。测量的电性能表明，在正常的两相金属-绝缘体连续介质中的三相复合材料中发生的渗滤转变。我们的压电测量还显示了一个渗滤过渡，这提供了一个实验测试的临界行为的压电复合材料与导电填料在渗滤制度。因此，多铁性复合材料在低f范围内表现出增加的磁电响应，但当f接近渗透阈值时，这种磁电响应急剧下降，在该阈值以上，复合材料仅变成导电的磁致伸缩复合材料。The inacti.
We report on a systematic experimental investigation of a class of multiferroic, three-phase particulate composite of Tb–Dy–Fe alloy, lead–zirconate–titanate (PZT), and polymer, in which a small volume fraction f of Tb–Dy–Fe alloy particles without and with the particle surfaces modified by an inactive surfactant are dispersed in PZT/polymer mixture. The measured electrical properties demonstrate that a percolation transition occurs in the three-phase composite as in normal two-phase metal–insulator continuum media. Our piezoelectric measurements also show a percolation transition which provides an experimental test of the critical behavior of the piezoelectric composites with conductive fillers in the percolation regime. Accordingly, the multiferroic composite exhibits increasing magnetoelectric response in the low f range, but such magnetoelectric response sharply drops when f approaches the percolation threshold above which the composite becomes a conductive, magnetostrictive composite only. The inacti...