In piezoelectric ceramics for the high-power application, small elasticity losses and excellent durability are required. When the acceptor is added in the Pb(Zr, Ti)O3, which is abbreviated to be PZT, the mechanical quality factor (Qm) increases, while the material hardens and the elasticity loss is improved. In this paper, we study piezoelectric property, crystal structure and microstructure for PZT. The maximum value of Qm was obtained in the sample with 0.005 mol% Fe2O3. In case of MnO2 addition, the electromechanical coupling factor (k31) value gradually lowered over 0.01 mol% addition. The Qm value drastically decreased over 0.02mol% addition.
The crystal structure of the PZT was tetragonal phase. By MnO2 addition of 0.005-0.01mol%, the lattice constants a and c together shorted a little. Over 0.02mol% addition, the lattice constant c decreased and the lattice constant a increased, and the crystal structure was approached to cubic phase. In case of MnO2 addition, the c/a ratios were almost constant within the 0.005-0.02 mol%. The grain growth became remarkable of sintered compact with the increase of the doped quantities.
