PIEZOELECTRIC RESONANCE INVESTIGATION OF INTRINSIC-PROPERTIES OF FERROELECTRICS

For the measurements of piezoelectric properties of ferroelectrics the re are many sources which limit the measured mechanical quality factor Q(M) to smaller values than the intrinsic ones. At the same time the resonance frequency shifts to some extent. These include the effects o f electrodes, electrode wires, supports holding the sample to a fixed position in gravity and atmosphere surrounding it. We developed a meth od which can be applied to small samples. In this method the sample is launched upward in vacuum with a small momentary velocity and the pie zoelectric resonance signal is detected inductively, by a coil, at the moment of temporal slowing down of the sample near the top of its tra jectory.