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摘要
A class of multiferroic, three-phase particulate composites of Tb-Dy-Fe alloy, lead-zirconate-titanate (PZT), and polymer are investigated, in which a small volume fraction f of Tb-Dy-Fe alloy particles are dispersed in a PZT/polymer mixture. The measured dielectric, piezoelectric, and magnetoelectric properties demonstrate that a percolation transition occurs at fsimilar to0.12 in the composites. When f is low (e.g., f<0.07), the composites exhibit piezoelectric and increasing magnetoelectric response. In the critical f range of 0.07<f<0.12, such piezo- and magnetoelectric responses sharply drop, and equal zero at the percolation threshold, above which the composite becomes a conductor and a magnetostrictive composite only.
