Defect‐Driven Structural Distortions at the Surface of Relaxor Ferroelectrics

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...

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...

Anisotropic nonlinear dielectric response of relaxor ferroelectrics

The anisotropy of the nonlinear static dielectric response of inorganic relaxor ferroelectrics of lead magnesium niobate PMN type is studied in the framework of the spherical random bond–random field model. Assuming that the shape of a polar nanoregion PNR and thus its dipole moment is modified by the action of homogeneous lattice strains, the anisotropic part of the interaction between the PNR...

Computational Studies of Lead-based Relaxor Ferroelectrics

Relaxor ferroelectrics have been a focus of intense attention due to their fascinating physical properties. Their diffuse phase transitions have been explained by the polar nanoregion model. Nevertheless, fundamental characterization of structure and dynamics in relaxors is still a long-standing challenge. Better scientific understanding of the microscopic origins of relaxor behavior is also re...

Local Ordering in Pb-based Relaxor Ferroelectrics