Mechanism of hopping conduction in Be–Fe–Al–Te–O semiconducting glasses and glass–ceramics
Date
2022-01
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Publisher
Springer
Abstract
Electrical properties of beryllium-alumino-tellurite glasses and glass–ceramics doped with iron ions were studied using impedance spectroscopy. The conductivity was measured over a wide frequency range from 10 mHz to 1 MHz and the temperature range from 213 to 473 K. The D.C. conductivity values showed a correlation with the Fe-ion concentration and ratio of iron ions on different valence states in the samples. On the basis of Jonscher universal dielectric response the temperature dependence of conductivity parameters were determined and compared to theoretical models collected by Elliott. In glasses, the conduction process was found to be due to the overlap polaron tunneling while in glass–ceramics the quantum mechanical tunneling between semiconducting crystallites of iron oxides is proposed. The D.C. conductivity was found not to follow Arrhenius relation. The Schnakenberg model was used to analyze the conductivity behavior and the polaron hopping energy and disorder energy were estimated. Additionally, the correlation between alumina dissolution and basicity of the melts was observed.
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This article is published open access in the Journal of Materials Science, also available at https://doi.org/10.1007/s10853-021-06834-w. Made available under the CC BY-4.0 license.
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Journal Article
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Citation
Wójcik, N.A., Tagiara, N.S., Möncke, D. et al. Mechanism of hopping conduction in Be–Fe–Al–Te–O semiconducting glasses and glass–ceramics. J Mater Sci 57, 1633–1647 (2022). https://doi.org/10.1007/s10853-021-06834-w