201. Dielectric features of Au2O3 doped Li2O-SiO2 glass system-influence of Pb3O4.
- Author
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Kut, T.V.N. Keerti, Bafti, A., Pisk, J., Pavić, L., Sekhar, A. Venkata, Naresh, P., Reddy, A. Siva Sesha, Raju, G. Naga, Kumar, V. Ravi, and Veeraiah, N.
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GLASS construction , *SPACE charge , *CERAMICS , *DIELECTRICS , *DIELECTRIC properties , *GLASS , *GLASS-ceramics - Abstract
• Pb 3 O 4 mixed Li 2 O-SiO 2 :Au 2 O 3 glasses were synthesized and characterized. • Different dielectric parameters viz., ε ′ , M, Z and σ a c were measured as functions of Au 2 O 3 content. • ε′ was decreased with Au 2 O 3 upto 0.04 mol% due to growing presence of PbO 4 units. • Observed dipolar relaxation effects were evaluated using Cole-Cole diagrams. • σ a c exhibited a decreasing trend with Au 2 O 3 content up to 0.04 mol%. • Overall, the presence of red lead was found to reduce the conductivity in these glasses. Studies on dielectric properties viz., ε′ (dielectric permittivity), M, Z and σ ac as functions of frequency and temperature (over wide ranges), of glasses/glass-ceramics give quantitative information on their insulating character. Such studies are also useful for understanding structural aspects of these glasses to a great extent. In this work Pb 3 O 4 mixed Li 2 O-SiO 2 :Au 2 O 3 glasses were synthesized and heat-treated. Analysis of the results of various characterization techniques indicated increased degree of internal augmentation between various structural groups of the glass network. Observed decrease of ε′ with Au 2 O 3 content up to 0.04 mol% was attributed to the decreased magnitude of space charge polarization due to growing presence of PbO 4 units in the glass network. Dipolar relaxation effects of these samples were evaluated using Cole-Cole plots. Variation of conductivity with Au 2 O 3 concentration was analyzed using polaronic tunneling model. Conclusions of these results were found to be in in concurrence with spectroscopic studies. Overall, the presence of Pb 3 O 4 caused reduction the conductivity of these glasses. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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