Dielectric spectroscopy on aging glasses

TL;DR

This paper investigates dielectric spectroscopy in aging glasses, validating a modified stretched-exponential model for aging data and confirming its scaling predictions across different frequencies.

Contribution

It provides empirical evidence supporting a new modified stretched-exponential model for aging in glasses and tests its scaling behavior with experimental data.

Findings

Modified stretched-exponential model fits aging dielectric data

Scaling of aging data across frequencies is validated

New data on Salol and propylene carbonate support the model

Abstract

In the present work, we provide further evidence for the applicability of a modified stretched-exponential behavior, proposed recently for the description of aging-time dependent data below the glass temperature [P. Lunkenheimer et al., Phys. Rev. Lett. 95 (2005) 055702]. We analyze time-dependent dielectric loss data in a variety of aging glasses, including new data on Salol and propylene carbonate, using a conventional stretched exponential and the newly proposed approach. Also the scaling of aging data obtained at different measuring frequencies, which was predicted on the basis of the new approach, is checked for its validity.