Longitudinal relaxation of mechanically clamped KH_{2}PO_{4} type crystals

TL;DR

This paper develops a theoretical model to describe the longitudinal relaxation and dielectric properties of mechanically clamped KH₂PO₄ ferroelectric crystals, aligning well with experimental observations.

Contribution

It introduces a modified proton ordering model incorporating strain effects and uses advanced approximations to accurately predict dielectric behavior.

Findings

Good quantitative agreement with experimental data

Effective modeling of strain contributions to dielectric permittivity

Enhanced understanding of relaxation dynamics in KH₂PO₄ crystals

Abstract

Within the framework of a modified proton ordering model of the KH_{2}PO_{4} family ferroelectric crystals, taking into account a linear over the strain \varepsilon_{6} contribution into the proton system energy, we obtain an expression for longitudinal dynamic dielectric permittivity of a mechanically clamped crystal using the four-particle cluster approximation and the dynamic Glauber approach. At a proper choice of the model parameters, we obtain a good quantitative description of available experimental data for these crystals.