Effect of some dopants on piezomodulus d33 of Na0.5Bi0.5TiO3-0.06BaTiO3 lead-free relaxor ferroelectrics ceramics

Na0.5Bi0.5TiO3-0.06BaTiO(3) relaxor ferroelectrics ceramics samples, doped with 1 wt.% of CuO, Fe2O3, Sb2O3, La2O3 and Ta2O5, were investigated. The grain structures were observed and corresponding piezomodulus were d(33) measured for all the compounds at room temperature. It was shown that the piezomodulus d(33) enhanced as the grain size increased, and in the same time, the piezomodulus d(33) weakened as the radius of incorporated ion enlarged. The mechanisms of such dependence of piezomodulus d(33) on both grain sizes and radii were discussed.