Temperature development of glassy alpha-relaxation dynamics determined by broadband dielectric spectroscopy

TL;DR

This study investigates the temperature dependence of alpha-relaxation times in 13 glass formers using broadband dielectric spectroscopy, testing model predictions against extensive experimental data including aging effects.

Contribution

It provides a comprehensive dataset for alpha-relaxation times across a wide temperature range, including aging data, and critically tests the Vogel-Fulcher-Tammann equation against a new model.

Findings

VFT equation's applicability is evaluated against experimental data.

A new model shows superior fit to viscosity data.

Extensive relaxation data up to 16 decades in relaxation time.

Abstract

We present the temperature dependence of alpha-relaxation times of 13 glass formers determined from broadband dielectric spectroscopy, also including data from aging measurements. The data sets partly cover relaxation-time ranges of up to 16 decades enabling a critical test of the validity of model predictions. For this purpose, the data are provided for electronic download. Here we employ these results to test the applicability of the Vogel-Fulcher-Tammann equation and a recently proposed new approach that was demonstrated to provide superior fits of a vast collection of viscosity data.