Nonlinear Dielectric Response of Relaxor PMN-PZT Ceramics under DC Electric Field

Abstract

The dielectric behaviors of (1−x)Pb(Mg 1/3 Nb 2/3 )O 3 −xPb(Zr 0.53 Ti 0.47 )O 3 (PMN-PZT) relaxor ferroelectric ceramics of several compositions (x = 0.05-0.30) have been studied under high bias electric field. The dielectric constant decay with dc electric field was observed in the range of diffuse phase transitions. The nonlinear dielectric response was considered in frames of thermodynamic approach. It was shown also that all dielectric features may be understood using a model involving heterogeneous polar micro-and nanoregions.

Low‐frequency 1/f noise in relaxor ferroelectric PMN–PZT

“…the peak is a relaxation one. Such frequency behaviour of the dielectric characteristic is explained in terms of relaxation of polar regions and their interaction between themselves [7]. Similar types of dependences are observed for the compositions with х = 0.05 and 0 as well; however, an increase of x is accompanied by a decrease of the width of the temperature interval in which the pronounced dispersion exists, i.e.…”

“…3 shows that for solid solutions of PMN-PZT a reduction of α occurs as the PZT content is decreased. In accordance with [7], one can assume that the 1/f noise is caused by fluctuations of polarization. This can be confirmed by the fact that the addition of PMN in ferroelectric PZT leads to the formation of a solid solution with characteristic Burns temperature (temperature of polar region formation).…”

Crossover from Relaxor to Ordinary Ferroelectric State in PMN-PZT System

“…The measurements concerning the influence of external electric field on the dielectric permittivity at various temperatures were carried out in the heating regime after zero field cooling [15]. For all investigated compounds of the PMN-PZT system the external bias leads to the ε value decreasing that clearly seen in the ε temperature dependences at various values of the external bias.…”

“…As it known, relaxors are characterized by many anomalous physical properties in the broad temperature interval of diffused phase transition [1][2][3]. For the explanation of peculiarities of physical properties of relaxors authors use some models such as: the model of composition fluctuation [4,5], superparaelectric model [6], the model of composition ordering [7], the models of random fields [8,9], random bonds-random fields [10], etc.…”

Dimensional effects in nanosized layers under establishing polarization in hydrogen-bonded crystals

“…However, it is noteworthy that no physical mechanisms of dielectric relaxation are proposed in these works. The Debye-model is successfully employed in [17,18] for studying the dielectric permittivity dispersion.…”