Pressure-induced structural transformations in advanced ferroelectrics with relaxor behaviour

Phase Transitions in Relaxor Ferroelectrics

This paper covers the properties of relaxor ferroelectrics and considers the transition from the paraelectric state to the relaxor state comparing experimental data with the spherical random-bond randomfield model (SRBRF). It found that this model predicts and is experimental verifies a glassy state at the transition temperature for E < Ec and a ferroelectric state with quench random fields for...

Field-induced percolation of polar nanoregions in relaxor ferroelectrics.

A first-principles-based effective Hamiltonian is used to investigate low-temperature properties of Ba(Zr,Ti)O(3) relaxor ferroelectrics under an increasing dc electric field. This system progressively develops an electric polarization that is highly nonlinear with the dc field. This development leads to a maximum of the static dielectric response at a critical field, E(th), and involves four d...

0 Dynamics of relaxor ferroelectrics

We study a dynamic model of relaxor ferroelectrics based on the spherical random-bond—random-field model and the Langevin equations of motion written in the representation of eigenstates of the random interaction matrix. The solution to these equations is obtained in the long-time limit where the system reaches an equilibrium state in the presence of random local electric fields. The complex dy...

Local Ordering in Pb-based Relaxor Ferroelectrics

Preparation and Field-Induced Electrical Properties of Perovskite Relaxor Ferroelectrics

(111)-oriented and random oriented Pb0.8Ba0.2ZrO3 (PBZ) perovskite relaxor ferroelectric thin films were fabricated on Pt(111)/TiOx/SiO2/Si substrate by sol-gel method. Nano-scaled antiferroelectric and ferroelectric two-phase coexisted in both (111)-oriented and random oriented PBZ thin film. High dielectric tunability (i = 75%, E = 560 kV/ cm ) and figure-of-merit (FOM ~ 236) at room temperat...