Dielectric Constant of Lead Titanate Zirconate Ceramics at High Frequency

Abstract

A region of dielectric dispersion has been found in ferroelectric lead titanate zirconate ceramics at frequencies about 1Gc/sec. The losses associated with the dispersion are quite high, the dissipation factor rising to about 0.4 at 2Gc/sec. The magnitude of the dispersion is halved in the measured frequency range (500 Mc/sec to 2 Gc/sec) by electrical orientation (poling) of the ceramic. Two mechanisms which may account for the effect, inertial clamping of the piezoelectric response of ferroelectric domains and clamping of domain-wall motion, are discussed.