Transport properties of phosphomolybdate and phosphotungstate glasses

Selvaraj, U. ; Rao, K. J. (1988) Transport properties of phosphomolybdate and phosphotungstate glasses Philosophical Magazine Part B, 58 (2). pp. 203-216. ISSN 0958-6644

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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 2αRij (α is the tunnelling probability). The conductivity parameter 2αRij is quite useful to resolve the controversy regarding the tunnelling term exp(2αRij) existing in the literature. For low values of 2αRij, it is shown that the exp (2αRij) term is very significant.

Item Type:Article
Source:Copyright of this article belongs to Taylor and Francis Ltd.
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Deposited On:17 May 2012 04:13
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