Paper Title:
A Phenomenological Description of the PALS Response in Glass - Forming Systems
  Abstract

A phenomenological description of the ortho-positronium (o-Ps) response from positron annihilation spectroscopy (PALS) and the dynamics from viscosity studies on two typical glass-forming compounds within the framework of the two-order parameter (TOP) model is presented. The dynamical data are accounted for by the modified Vogel – Fulcher – Tamman - Hesse (M-VFTH) equation. Subsequently, the quasi-sigmoidal course of the o-Ps lifetime, τ3, with or without the high-temperature plateau region as a function of the temperature over a wide temperature range can be described by an effective free volume version of the TOP model. This simultaneous description suggests a close relationship between the PALS response and the dynamics of supercooled liquids and seems to support the liquid - like and solid - like domain physical picture of all the three physical states of the disordered phase of the condensed systems.

  Info
Periodical
Edited by
S. J. Wang, Z. Q. Chen, B. Wang and Y. C. Jean
Pages
48-52
DOI
10.4028/www.scientific.net/MSF.607.48
Citation
J. Bartoš, "A Phenomenological Description of the PALS Response in Glass - Forming Systems", Materials Science Forum, Vol. 607, pp. 48-52, 2009
Online since
November 2008
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