Electrical conductivity and dielectric properties of Bi2O3-GeO2-PbO-MoO3 glasses |
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Authors: | Shaaban M. Salem E.A. Mohamed |
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Affiliation: | a Department of Physics, Faculty of Science, Al Azhar University, Nasr City 11884, Cairo, Egyptb Department of Physics, Faculty of Science (Girl's Branch), Al Azhar University, Nasr City, Cairo, Egyptc Department of Physics, Faculty of Science and Arts in Samtah, Jazan University, Saudi Arabia |
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Abstract: | Glasses having compositions 40Bi2O3-20GeO2-(40−x)PbO-xMoO3 (where x = 3, 6, 9, 12 and 15 mol%) were prepared by normal melt quenching technique. The density (d) decreases gradually with the increase of the MoO3 content in such glasses. This may be due to the lower molecular weight MoO3 is substituted by a higher molecular weight PbO. The dc conductivity decreases while the activation energy increases with the increase of the MoO3 content. The dc conductivity in the present glasses is electronic depends strongly upon the average distance, R, between the Mo ions. Analysis of the electrical properties has been made in the light of small polaron hopping model. The parameters obtained from the fits of the experimental data to this model are reasonable and consistent with glass composition. The conduction is attributed to non-adiabatic hopping of small polaron. Dielectric properties (constant ε, loss tan δ, ac conductivity σac, over a range of frequency 0.12-100 kHz and temperature 325-650 K and frequency exponent s) of these glasses have been studied. |
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Keywords: | Germanium Lead Molybdenum oxide Bismuthate glass Dielectric properties Transition metal ions Ac and dc conductivities Activation energies |
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