Experimental studies and space charge mechanism for the conductivity/mobility enhancement due to SnO2 dispersion in Ag+ ion conducting borate glass

The enhancement in ionic conductivity of a Ag+ ion conducting borate glass of molar % composition 55.5 AgI-22.25 Ag2O-22.25 B2O3 is reported with the dispersion of SnO2. XRD, IR and optical microscopy reveals that the SnO2 addition yields a dispersed phase material and not a new glass. The material...

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Bibliographic Details
Published in:Journal of materials science 1995-07, Vol.30 (13), p.3457-3462
Main Authors: SHAJU, K. M, CHANDRA, S
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Diffusion in solids
Exact sciences and technology
Physics
Self-diffusion and ionic conduction in nonmetals
Transport properties of condensed matter (nonelectronic)
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Summary:The enhancement in ionic conductivity of a Ag+ ion conducting borate glass of molar % composition 55.5 AgI-22.25 Ag2O-22.25 B2O3 is reported with the dispersion of SnO2. XRD, IR and optical microscopy reveals that the SnO2 addition yields a dispersed phase material and not a new glass. The material is essentially a Ag+ ion conducting (AgI + Ag2O + B2O3) glass in which SnO2 is dispersed. The direct measurement of mobility of the mobile ions reveals that enhancement in conductivity is controlled by enhancement in mobility. A space charge model based on the mechanism of adsorption-desorption of mobile ions near/at the interface in the space charge region creating a certain type of mobile ion concentration gradient is introduced to explain the results. 22 refs.
ISSN:0022-2461
1573-4803
DOI:10.1007/BF00349894