Abstract
Electron paramagnetic resonance in glasses of compositions (P2O5)100−x-(CuO)x and (P2O5)50-(TeO2)50−x-(CuO)x where x varied from 20 to 40 mol% has been investigated. The distribution of the copper between the two main valency states is determined from measurements of e.s.r. arising from the Cu2+ centres. The study of e.s.r. enables the distribution of copper in the glasses between the different valency states to be determined and thus indirectly provides evidence for hopping conduction in the glasses. From the results of e.s.r. and the chemical analysis of the samples it is found that the reduced valency ratioC, i.e. the ratio of the concentration of Cu+ ions to that of total copper in the glass, increases with increasing CuO content.
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