Novel Concept of Non-Debye Dipole Relaxation Processes for the Interpretation of Physical Origin of Dielectric Loss in the Glass Formers, Drugs, Polymers and Plastic Crystals

TL;DR

This paper introduces a new model based on non-Debye dipole relaxation processes to explain the physical origin of dielectric loss in various materials, providing better understanding of relaxation phenomena.

Contribution

It proposes a novel concept of non-Debye dipole relaxation processes involving intermolecular interactions, explaining multiple relaxation behaviors in complex materials.

Findings

The model accurately fits experimental dielectric loss data.

It explains the physical origin of various relaxation types.

The approach unifies understanding of dielectric relaxation in diverse materials.

Abstract

The physical origin of dielectric loss is shown to be sum of n number of subunits relaxation of a molecule, where n=1,2,3.. For each subunit relaxation, the idea of intermolecular dipole-dipole interactions triggered non-Debye dipole, ($\bf G$)$_{n}$=((1-g$_d$)$\bf G$$_{0}$)$_{n}$, and the ensuing dual dipole ($\bf G$$_{\pm}$)$_n$=($\bf G$$_0$$\pm$$\bf G$)$_n$, relaxation processes is proposed, where $\bf G$$_{-}$=g$_{d}$$\bf G$$_{0}$, $\bf G$$_{+}$=(2-g$_{d}$)$\bf G$$_{0}$, and $\bf G$$_{0}$ is a Debye dipole. Each subunit motion is statistically highly independent process and discriminated by Debye and non-Debye relaxation (NDR) time, where g$_d$ is an exponent 0<g$_d$<1 and signifies interaction strength with a redistribution and conservation of Debye dielectric loss energy. The proposed concept provides a new insight for the NDR and discloses the physical origin of $\alpha$, $\beta$, $\gamma$, $\delta$ relaxations and excess wing of glass formers, plastic crystals, drugs, etc., with an excellent agreement with experimental results.