Dielectric behavior of the PbNb2O6 ferroelectric ceramic in the frequency range of 20 Hz to 2 GHz

Ferroelectric materials with high Curie temperature are highly desirable to construct transducers for high temperature piezoelectric applications. Among them, the lead niobate system is one that displays such characteristic. In this work, the dielectric behavior of lead niobate ferroelectric ceramics was analyzed in the frequency range of 20 Hz to 2 GHz. Ceramic samples with nominal formula PbNb2O6 (PN) were prepared by the solid-state reaction method. The diffuse phase transition was investigated with the Santos–Eiras’ phenomenological model. The values of ξ are close to 1, indicating a conventional ferroelectric phase transition. A low frequency dispersion process, which may be associated to a conduction mechanism, was observed up to 50 kHz. The PN materials show a typical high frequency dispersion process, which may be associated to the domain wall dynamic, as observed in ferroelectric materials in the microwave frequency region, rather than the nano-clusters relaxation process or low frequency dispersion.