Doping effect of SiO2/CeO2 on the dielectric, ferroelectric and piezoelectric properties of (Ba0.7Ca0.3)(Zr0.2Ti0.8)O3 ceramics

摘要

Lead-free (Ba0.7Ca0.3)(Zr0.2Ti0.8)O3 ceramics (BZT-50BCT) with x wt% (x=0,0.05,0.1,0.2,0.4) dopant (SiO2 and CeO2) were prepared by the conventional solid-state reaction from the industry available raw materials. The doping effect of SiO2 and CeO2 with different concentrations on the microstructures and electric properties of BZT-50BCT ceramics was systematically investigated in the present study. Moderate doping level would result in the fine microstructures and the consequent enhanced dielectric, ferroelectric and piezoelectric properties while excessive doping would cause the degradation of the properties. The best piezoelectric performance of d33=476pC/N was achieved by 0.05 wt% CeO2 doping.