Transport properties of lead phosphate glass doped by cobalt,vanadium and chromium oxides |
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| Authors: | Kh Roumaih M Kaiser Fatma H Elbatal IS Ali |
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| Institution: | 1. Reactor Physics Department , Nuclear Research Center , Atomic Energy Authority, Cairo, Egypt khroumaih@yahoo.com;3. Reactor Physics Department , Nuclear Research Center , Atomic Energy Authority, Cairo, Egypt;4. Glass Research Department , National Research Center , Dokki, Cairo, Egypt;5. Makkah Community College–Umm Al‐Qura University;6. High Institute of Optics Technology , Cairo, Egypt |
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| Abstract: | The electrical transport properties were investigated of a glass system of basic composition 50?mol. % Pb3O4–50?mol. % P2O5 containing CoO, Cr2O3 or V2O5 dopanys. The ac conductivity and the thermoelectric power were measured as a function of temperature. Properties such as dielectric constant, loss factor tangent and electrical conductivity are reported in the frequency range 200?Hz–100?kHz and temperature range 300–450?K. The variation in electrical conductivity with temperature was found to depend on the types of transition metal ions involved. The temperature dependence of the frequency exponent, s, was analyzed using different theoretical models. The variation of the thermoelectric power with temperature indicated the presence of more than one conduction mechanism for the investigated samples. This result was confirmed with the results of the dielectric properties at different frequencies. The introduction of cobalt ions in glass formers improves the electrical properties of non-crystalline ionic conductors. |
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| Keywords: | lead phosphate glass ac conductivity thermoelectric power ionic conductivity hopping conductivity |
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