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Transport properties of phosphomolybdate and phosphotungstate glasses

Selvaraja, U and Rao, KJ (1988) Transport properties of phosphomolybdate and phosphotungstate glasses. In: Philosophical Magazine Part B: Physics of Condensed Matter. Electronics, Optical and Magnetic Properties, 58 (2). pp. 203-216.

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Abstract

The d.c. conductivity of phosphomolybdate and phosphotungstate glasses is discussed. The conductivity of these glasses is due to the hopping of electrons between two valence states (Mo5+ to Mo6+ or W5+ W6+). In some of the glasses, the activation energy itself is found to be a function of temperature. This appears to be due to thermally activated and variable-range hopping mechanisms operating in different temperature regimes. The relation between conductivity and the [M5+]/[Mtotal](M ≡ Mo, W) ratio does not show any systematic variation. This anomaly can be understood using the structural models of these glasses. In contrast, Mott's theory and the Triberis and Friedman model have been used to obtain conductivity parameters such as the percolation distance Rij and 2agrRij (agr is the tunnelling probability). The conductivity parameter 2agrRij is quite useful to resolve the controversy regarding the tunnelling term exp(2agrRij) existing in the literature. For low values of 2agrRij, it is shown that the exp (2agrRij) term is very significant.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Taylor and Francis Group.
Keywords: Glass;Electrical properties;Electrical conductivity;Property composition relationship;Structural model.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 12 Oct 2010 11:01
Last Modified: 12 Oct 2010 11:01
URI: http://eprints.iisc.ernet.in/id/eprint/33059

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