Features of dielectric response in PMN–PT ferroelectric ceramics

Abstract

In this paper, electrical and structural properties were reported for pyrochlore free (1 − x)[Pb(Mg1/3Nb2/3)O3] − xPbTiO3 (PMN–PT) (with 35 mol% PbTiO3) ceramics obtained from fine powders. Dielectric studies were focused on the investigation of the complex dielectric permittivity (ε′ − iε″) as a function of frequency and temperature. The effects of the dc applied electric field on dielectric response were also investigated. Results revealed a field dependence dielectric anomaly in the dielectric permittivity curves (ε(T)) in the low dc electric field region, which in turn prevails in the whole analysed frequency interval. To the best of our knowledge, these properties for the PMN–PT ceramic system have not been reported before as in this work. The results were analysed within the framework of the current models found in the literature.

Dielectric tunability in (1&#x2212;x)[Pb(Mg<inf>1/3</inf>Nb<inf>2/3</inf>)O<inf>3</inf>]&#x2212;xPbTiO<inf>3</inf> ceramics for tunable devices application

“…In addition to a high tunability, a low dielectric loss is necessary for tunable devices applications. The observed studied PMN-0.35PT composition also revealed low dielectric loss (tanδ), as previously reposted by the present authors [8], with tanδ values from 0.03 up to 0.07 with the increase of the electric field, at 300 K. These results also confirm the capability of the studied composition for high frequency applications.…”

“…1 shows the shows the ferroelectrics properties of the studied PMN-35PT ceramics samples, represented by the hysteresis loops obtained at several temperatures and 1 Hz (a), and the temperature dependence of the remanent polarization, P r , and coercive field, E c (b). Results reveal typical characteristics of 'normal' ferroelectrics, as previously discussed from the dielectric properties results and reported by the present authors [8]. The obtained values for the remanent polarization and coercive field for temperatures near the room temperature were around 35 μC/cm 2 and 5.5 kV/cm, respectively.…”

“…1(b) that both P r and E c show a decrease with the increase of the temperature, indicating the evolution for a paraelectric-ferroelectric phase transition. In agreement with previous results for the studied composition, where the transition temperature was observed around 450 K [8]. The dielectric response of the studied composition has been investigated by considering the influence of the applied dc bias electric field (E dc ), superimposed to the small signal ac electric field, in a wide temperature and frequency range.…”

Ceramics, Electronic

“…For several applications, for example, for power actuators, PMN and PZN will be combined with PT to yield outstanding properties including high piezoelectric strain coefficient d ij , high electromechanical coupling factor k ij and high strain levels under a d.c. field, making the materials useful for nonresonant or large bandwidth transducers [125,126].…”

Dielectric and Mechanical Nonlinear Behavior of Mn Doped PMN-35PT Ceramics

“…PMN-PT system shows, from the fundamental point of view, intriguing physical properties, which are reflected in the dielectric response. However, in this system, there are ambiguous reports concerning the existence and origin of the observed dielectric behavior under external applied electric fields [10], although it is widely accepted that one of their origin is the movement of the domain walls [9]. In a recent work, dielectric and piezoelectric nonlinear responses of PMN-35PT ceramics were investigated [11].…”