Investigation of ferroelectric order-disorder type compounds with asymmetric double-well potential

TL;DR

This paper studies the Mitsui model for ferroelectric compounds with asymmetric double-well potentials, deriving phase diagrams and dielectric properties, and applying the model to Rochelle salt and RbHSO4 crystals.

Contribution

It provides a detailed analysis of the Mitsui model within mean field approximation and applies it to specific ferroelectric materials, enhancing understanding of their properties.

Findings

Phase diagram dependence on transverse field

Calculated dielectric characteristics of Rochelle salt

Good description of RbHSO4 thermodynamic properties

Abstract

The Mitsui model for the order-disorder type ferroelectrics is studied within the mean field approximation. The phase diagram of the model is obtained, its dependence on the transverse field is obtained. A scheme of setting the values of the model parameters is proposed; all the dielectric characteristics of Rochelle salt are calculated with the found parameters. Within the Mitsui model we study the physical characteristics of RbHSO4 type crystals; the found values of the model parameters provide a good description of both dielectric and thermodynamic properties of these compounds.