Abstract
Torsion pendulum and resonance techniques were used for investigation of polycrystalline lead zirconate-titanate internal friction in the temperature range of 20–400°C. The compositions of samples were chosen close to the morphotropic phase boundary. Measurements of Q −1 were made on lead zirconate — titanate samples modified by the additions of niobium pentoxide ( B-composition) and without any additions ( A-composition). Two relaxation peaks were found on the Q −1( T) curves of the A-samples at 140 and 240°C; for B-samples these peaks were not observed. It is proposed that the peaks on the Q −1( T) curve are due to interaction of domain boundaries and charged point defects. The concentration of defects was changed by high-temperature annealing in different atmospheres. A calculation is presented of the value of internal friction caused by the diffusion of point defects to domain boundaries, where piezoelectric bound charges appear. The results of the calculations are in satisfactory agreement with the experimental data.
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