Abstract
Temperature dependent DC electrical conductivity studies of GeO2 substituted lead vanadate glass systems xGeO2(50-x)PbO:50V2O5 (x = 5, 10, 15 mole%) were carried out and the results are reported. X-ray diffraction results reveal that all samples are perfect amorphous in nature. DSC results indicate that the substituent GeO2 is replacing PbO in the glass network in such a way that the eutectic composition is maintained. DC electrical conductivity studies of the glass samples indicate that the systems are characterized by different activation energies in different temperature ranges which in turn depend on the annealing temperature. These results are interpreted in terms of temperature dependent microstructural changes in these glass systems.
Highlights
In view of their potential applications, research on amorphous semi-conductors in thin film or bulk form has been receiving increased attention [1] [2]
differential scanning calorimetry (DSC) recordings show that eutectic composition of the lead meta vanadate has been maintained for all the glass systems upto 15 mole% of substitution
In the case of 15 mole% GeO2 substituted samples there is a tendency for deviation from eutectic melting as is evidenced by the appearance of a small shoulder above the peak corresponding to eutectic melting in its DSC thermogram
Summary
In view of their potential applications, research on amorphous semi-conductors in thin film or bulk form has been receiving increased attention [1] [2]. Semiconducting oxide glasses like lead vanadate form an important class of the amorphous semiconductors and are being studied in great detail [3] [4] In addition to their applications, basic understanding of the physical properties of these materials is of a great fundamental importance [5] [6] in research on these materials. Considering the enormous variation in their composition, the scope for research on these materials is very wide Recent studies in this laboratory have indicated that lead metavanadate glass systems exhibit interesting changes in their physical properties depending on the substitution of different metal oxides in the place of lead oxide [7] [8]. The results are expected to be interesting since GeO2 is a glass former
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