Distribution of ionic charge carriers and migration barriers in binary alkali silicate glasses

Rao, KJ and Elliott, SR (1994) Distribution of ionic charge carriers and migration barriers in binary alkali silicate glasses. In: Proceedings of the indian academy of sciences - chemical sciences, 106 (4). pp. 903-911.

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Abstract

Likely spatial distributions of network-modifying (and mobile) cations in (oxide) glasses are discussed here. At very low modifier concentrations, the ions form dipoles with non-bridging oxygen centres while, at higher levels of modification, the cations tend to order as a result of Coulombic interactions. Activation energies for cation migration are calculated, assuming that the ions occupy (face-sharing) octahedral sites. It is found that conductivity activation energy decreases markedly with increasing modifier content, in agreement with experiment.

Item Type:	Journal Article
Publication:	Proceedings of the indian academy of sciences - chemical sciences
Publisher:	Indian Academy of Sciences
Additional Information:	Copyright of this article belongs to Indian Academy of Sciences.
Keywords:	Alkali ions;silicate glasses;migration energy barriers; spatial distribution;activation energies;non-bridging;oxygen ions.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	02 Jun 2011 04:35
Last Modified:	02 Jun 2011 04:35
URI:	http://eprints.iisc.ac.in/id/eprint/36416

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