SUMMARY OF THE MEASUREMENT METHODS OF Q(M) FOR PIEZOELECTRIC MATERIALS

The Mechanical Quality Factor Q(m) is a material parameter of key importance for the piezoceramics characterization and, consequently, for the design of ultrasonic transducers. The development of low Q(m) materials has involved a reexamination of the old Q(m) measurements procedures. The paper tries to help to the historical revision and the search of present proposals for the measurement of Q(m).