Orientational Contribution to the Giant Electrostriction Effect and Dielectric Permittivity in Relaxors

TL;DR

This paper presents a microscopic model explaining how orientational polarization and strain rotations contribute to the giant electrostriction and dielectric permittivity observed in relaxor materials, emphasizing the role of random polar regions.

Contribution

It introduces a new microscopic model that accounts for orientational effects and polarization rotation in relaxors, linking microscopic behavior to macroscopic electrostrictive and dielectric responses.

Findings

Orientational polarization significantly enhances electrostriction.

Polarization fluctuations influence dielectric permittivity.

External fields induce polarization and strain rotations in relaxors.

Abstract

A microscopic model is developed considering randomly oriented polar regions stuck to the directions of random fields or stresses. The application of an external field (stress) in this model results in a dielectric and acoustic reply connected with a polarization (strain) rotation. Polarization (strain) fluctuation contributions are also studied.