Separation of piezoelectric grain resonance and domain wall dispersion in PZT ceramics

TL;DR

This study investigates high-frequency dielectric dispersion in PZT ceramics, distinguishing between grain resonance effects and domain wall contributions, revealing how poling affects these mechanisms.

Contribution

The paper experimentally separates piezoelectric grain resonance from domain wall dispersion in PZT ceramics, providing insights into their distinct dielectric loss mechanisms.

Findings

Lower-frequency peak correlates with grain size D<10μm.

Poling significantly reduces the high-frequency peak.

Two overlapping loss peaks are identified in the dielectric spectrum.

Abstract

We report on the experimental investigation of a high-frequency (1MHz - 1.8GHz) dielectric dispersion in unpoled and poled Pb(Zr,Ti)O3 ceramics. Two overlapping loss peaks could be revealed in the dielectric spectrum. The linear dependence between the lower-frequency peak position and average grain size D, which holds for D< 10mkm, indicates that the corresponding polarization mechanism originates from piezoelectric resonances of grains. The intensity of the higher-frequency peak is drastically reduced by poling. It is thus proposed that this loss peak is related to domain-wall contribution to the dielectric dispersion.