engleski

Electronic conductivity in vanadium phosphate glasses

Electronic conduction has been detected in various melt-quenched oxide glasses which contain transition- metal oxides (TMO) such as V2O5, Fe2O3, MoO3, and WO3. These materials are of great scientific interest due to their potential application in many fields such as power sources, photonics, gas sensors, etc. The electronic conductivity in these glasses occurs via electron hopping between transition metal ions in different oxidation states and, as a rule, strongly depends on the amount of transition metal oxide and a fraction of transition metal ions in different valence states. Among various TMOs which can be incorporated into oxide glasses, vanadium (V) oxide is especially attractive since it participates in the glass network formation and hence can be added in large amounts. In this study, a series of binary xV2O5–(100–x)P2O5 glasses with a wide range of composition from x = 30 to x = 90 mol%, were prepared by the melt quenching method. Obtained glass samples were investigated by Raman and impedance spectroscopies. With the increase of V2O5 content bands attributed to the stretching vibrations of V–O and V–O–P bonds are observed. The DC conductivity of glasses increases with the increase of V2O5 due to an increase in the concentration of vanadium ions reaching the highest conductivity of 1.03 × 10-4 (Ω cm)-1 at 30 °C for glass with 90 mol% V2O5. All glasses obey Summerfield and Sidebottom scaling procedures of conductivity spectra indicating that the conductivity mechanism does not change with the temperature.

electrical properties ; glass structure ; vanadium phosphate glasses

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