Dielectric and ferroelectric properties of CuO-doped lead magnesium niobate-based relaxor ferroelectric ceramics

摘要

In this work,we report the dielectric and ferroelectric properties of CuO-doped(1-x)[0.5573Pb(Mg_(1/3)Nb_(2/3))O_(3)-0.4427PbTiO_(3)]-xBa(Zn_(1/3)Nb_(2/3))_(3)(PMNT-xBZN)relaxor ferrielectric ceramic samples with x=0.1725,0.1925,02125 and 0.2325,which were fabricated by a conventional solid-state reaction method.By introducing the CuO into PMNT-xBZN,the sintering temperature of this system is drastically lowered from 1280℃to 1120℃.The second pyrochlore phase,which is often generated during sintering at high temperature,is also inhibited.Meanwhile,broad dielectric peaks with strong dielectric relaxation characteristics are observed from
150℃to 100℃.Slim and slanted P-E hysteresis loops and purely electrostrictive strains with V-shape are obtained simultaneously in studied compositions from 30℃to 150℃.These results suggest that CuO could effectively lower the sintering temperature while maintaining the dielectric and ferroelectric properties of PMNT-xBZN relaxor ferroelectric ceramics.