Issue 8, 2005
From the journal:

Physical Chemistry Chemical Physics

Free volume anomalies in mixed-cation glasses revealed by positron annihilation lifetime spectroscopy (PALS)†

Malcolm D. Ingram,ac   Steven J. Pas,bcd   Cornelia Cramer,bc   Yong Gaobc  and  Anita J. Hillde  

a Department of Chemistry, University of Aberdeen, Meston Walk, Aberdeen, Scotland, UK

b Institute of Physical Chemistry, Münster, Germany

c Sonderforschungsbereich 458, Westfälische Wilhelms-Universität Münster, Corrensstraße 30/36, Münster, Germany

d CSIRO Manufacturing Infrastructure and Technology, Private Bag 33, Clayton South MDC, Victoria, Australia

e School of Chemistry, Monash University, Clayton, Victoria, Australia

Abstract

PALS experiments reveal a minimum in ortho-positronium (o-Ps) lifetimes and a maximum in the corresponding intensities that emerge when mixed-cation (Li/Na) borate glasses are heated from ambient temperatures up to 473 K. These free volume ‘anomalies’ appear to be a true manifestation of the mixed alkali effect (MAE). They are consistent with a mechanism of ion transport involving cooperation between hops of unlike cations, resulting in increased disturbance of the glass network. The result lends support to the dynamic structure model.

Graphical abstract: Free volume anomalies in mixed-cation glasses revealed by positron annihilation lifetime spectroscopy (PALS)

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Article information

DOI
https://doi.org/10.1039/B419201J
Article type
Communication
Submitted
22 Dec 2004
Accepted
03 Mar 2005
First published
15 Mar 2005

Phys. Chem. Chem. Phys., 2005,7, 1620-1623

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Free volume anomalies in mixed-cation glasses revealed by positron annihilation lifetime spectroscopy (PALS)

M. D. Ingram, S. J. Pas, C. Cramer, Y. Gao and A. J. Hill, Phys. Chem. Chem. Phys., 2005, 7, 1620 DOI: 10.1039/B419201J

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