(1-x)[0.5PbZrTiO3 - 0.5{Pb(Ni,Zn) 1/3Nb 2/3O3}] - x(Ni0.9Zn0.1Fe2O4) 세라믹스의 자기 전기적 효과

Abstract

In this paper, (1-x)[0.5PZT-0.25PNN-0.25PZN]+x[Ni0.9Zn0.1Fe2O4] particulate ceramic composites(x=0, 0.1, 0.2, 0.4, 0.6, 0.8, 1.0)were synthesized by conventional solid-state reaction method. The sintering, ferroelectric, piezoelectric, magnetic and magnetoelectric properties of particulate ceramic composites were investigated. The sintered composites exhibited rather homogenous microstructure. Two distinct phases, the piezoelectric phase with large grains and the ferrite phse with small grains, were clearly seen in the composites by XRD and SEM. The (1-x)[0.5PZT-0.25PNN-0.25PZN] + x[Ni0.9Zn0.1Fe2O4] composites exhibit typical P-E hysteresis loops accompanied by the decrease of remnant polarization and coercive field. The piezoelectric property of the (1-x)[0.5PZT-0.25PNN- 0.25PZN] + x[Ni0.9Zn0.1Fe2O4] composites deteriorates greatly with the increase of ferrite content. The (1-x)[0.5PZT-0.25PNN-0.25PZN] + x[Ni0.9Zn0.1Fe2O4] composites exhibit typical M-H hysteresis loops accompanied by the increase of remnant magnetization and saturation magnetization. The (1-x)[0.5PZT-0.25PNN-0.25PZN] + x[Ni0.9Zn0.1Fe2O4] composites were electrically poled and exhibited apparent magnetoelectric effect. A maximum longitudinal magnetoelectric voltage coefficient of 14.25(mV/cm Oe) was obtained in the 0.8 [0.5PZT-0.25PNN-0.25PZN]+0.2[Ni0.9Zn0.1Fe2O4] composite at 800 Oe d.c magnetic bias field superimposed 1kHz a.c magnetic field with 2Oe amplitude.