Effects of the MnO additives on the properties of Pb (Fe _2/3W_1/3) -PbTiO₃ relaxors: Comparison of empirical law and experimental results

In this paper, pure and 0.15 wt %MnO additives of (1-x) Pb (Fe23 W13) O3 -xPbTi O3 [(1-x) PFW-x PT] with x=0.1, 0.2, 0.3, and 0.4 were synthesized by the conventional solid state reaction method. The dielectric diffusion properties were investigated with the empirical law. The lattice structure was found to transfer from tetragonal to pseudocubic and the diffusion phase characteristic is more notable as decreasing PbTi O3 compositions or adding MnO additives. Moreover, the dielectric loss is improved and the space charge polarization effect is vanished as adding MnO additives in 0.7PFW-0.3PT compounds. We suggested it was probably due to the lead vacancy which is substituted by the manganese ions or the interstitial manganese ions intervene into the interstice between the positive and negative ions.