Direct correlation between non-random distribution of cations and ion transport mechanism in soda-lime silicate glasses

Murugavel, Sevi and Vaida, Chitra and Das, Chandasree and Asokan, Sundarrajan (2014) Direct correlation between non-random distribution of cations and ion transport mechanism in soda-lime silicate glasses. In: JOURNAL OF NON-CRYSTALLINE SOLIDS, 404 . pp. 84-90.

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Abstract

We report a direct correlation between dissimilar ion pair formation and alkali ion transport in soda-lime silicate glasses established via broad band conductivity spectroscopy and local structural probe techniques. The combined Raman and Nuclear Magnetic Resonance (NMR) spectroscopy techniques on these glasses reveal the coexistence of different anionic species and the prevalence of Na+-Ca2+ dissimilar pairs as well as their distributions. The spectroscopic results further confirm the formation of dissimilar pairs atomistically, where it increases with increasing alkaline-earth oxide content These results, are the manifestation of local structural changes in the silicate network with composition which give rise to different environments into which the alkali ions hop. The Na+ ion mobility varies inversely with dissimilar pair formation, i.e. it decreases with increase of non-random formation of dissimilar pairs. Remarkably, we found that increased degree of non-randomness leads to temperature dependent variation in number density of sodium ions. Furthermore, the present study provides the strong link between the dynamics of the alkali ions and different sites associated with it in soda-lime silicate glasses. (C) 2014 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	JOURNAL OF NON-CRYSTALLINE SOLIDS
Publisher:	ELSEVIER SCIENCE BV
Additional Information:	Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Keywords:	Ionic conduction; Soda-lime-silicate glasses; Impedance spectroscopy; MAS NMR
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	06 Feb 2015 14:55
Last Modified:	06 Feb 2015 14:55
URI:	http://eprints.iisc.ac.in/id/eprint/50783

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