Magneto-Electric Effect of KNN-Ni Composites

摘要

A conversion was facilitated with magneto-electric effect between energies stored in ferromagnetic form and piezoelectric one in material. This paper is concerned with magneto-electric performance of composites with a bi-layered structure for ceramic (Nao.5Ko.45Lio.o5)(Nbo.9Tao.o8Sbo.o2)O3, i.e., KNN, and metal nickel. Lead-free piezoelectric KNN ceramics were synthesized by the two-step sintering process. More than 96% of theoretical density for the ceramics was obtained, and, the d33 of the KNN sample was about 300pC/N. Based on the high piezoelectric performance of the KNN ceramic, a lead-free magnetoelectric composite was prepared by gluing KNN ceramic with Ni plate together. The magneto-electric effect of the bi-layered composites with various thickness ratios was investigated in details, with a magnetoelectric coefficient of about lOmV/Oe.