Electrical conductivity of ion-exchanged oxide glasses containing aluminium dispersoids
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The effect of sodium ⇌ silver exchange on the electrical properties of glasses in the systems Na2O-B2O3-SiO2-Al and Na2O-B2O3-Al have been investigated. In general, the ion-exchange step lowers the resistivity as well as the activation energy for conduction. The glasses have a highly inhomogeneous structure. The ion-exchanged glasses are characterized by a semi continuous silver-rich phase. These glasses can be switched to a highly conducting state by subjecting them to a critical electric field which varies from 0.2 to 5 vcm−1 depending on temperature and the virgin glass composition. The resistivities in the highly conducting state have values in the range 3 to 10 Ω cm with activation energies varying from 0.002 to 0.008 eV. Wagner's asymmetric polarization cell measurements show that such high conductivity is electronic in nature.
KeywordsPolymer Aluminium Activation Energy Electrical Conductivity Electrical Property
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