Experimental studies and space charge mechanism for the conductivity/mobility enhancement due to SnO2 dispersion in Ag+ ion conducting borate glass
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The enhancement in ionic conductivity of a Ag+ ion conducting borate glass of molar % composition 55.5 Agl-22.25 Ag20-22.25 B2O3 is reported with the dispersion of SnO2. X-ray diffraction (XRD), i.r. 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 (Agl+Ag2O+B2O3) glass in which SnO2 is dispersed. The direct measurement of mobility of the mobile ions reveals that the enhancement in conductivity is controlled by the 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.
KeywordsOptical Microscopy SnO2 Disperse Phase Space Charge B2O3
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