Study on frequency dependence of polarized piezoceramics constants in equivalent circuits at weak electric fields (part III)

Introduction.It is acknowledged that electroelastic modules do not depend on the amplitude and frequency of oscillations. This approach is reflected in the Russian and foreign standards for determining the complete set of electroelastic piezoceramics modules. For example, to determine 𝑑𝑑31 piezomodule of a discshaped sample, it is required to take measurements in three frequency domains: in the first and second resonances, in the antiresonance region, and at frequencies much below 1 kHz. Accordingly, it is assumed that when determining 𝑑𝑑31, the modules of the ceramic under study in the frequency range from 1 KHz to the second resonance are independent of frequency. The work objective is to study the frequency dependence of electroelastic ceramic modules. In this case, a discshaped sample from LZT (lead zirconate titanate) is used.Materials and Methods.Techniques of setting and solving problems of the stationary electroelasticity and sections of the electrical engineering basics are applied...