Abstract

The influence of a PbO excess in the PZT composition Pb 0.92 + xSr 0.08(Zr 0.515Ti 0.455Nb 0.02Mn 0.01)O 3 + x (0 < x < 0.12) was investigated. A sintering method was chosen for the ceramics manufacture. Weight-loss experiments were performed to compare the final PbO content values to the theoretical x, and a nearly stoichiometric area was observed for 0.04 < x < 0.08, corresponding to optimal piezoelectric coefficients. Substitution of Mn ion in a +2 or +4 valency state was studied. Measurements of vibration velocities with a view to ultrasonic motors application were carried out.

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