Electrical Mobility of Silver Ion in Ag2O鈥揃2O3鈥揚2O5鈥揟eO2 Glasses

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• 作者：Kristina Sklepi膰 ; Maryna Vorokhta ; Petr Mo拧ner ; Ladislav Koudelka ; Andrea Mogu拧-Milankovi膰
• 刊名：Journal of Physical Chemistry B
• 出版年：2014
• 出版时间：October 16, 2014
• 年：2014
• 卷：118
• 期：41
• 页码：12050-12058
• 全文大小：501K
• ISSN：1520-5207

文摘

The effect of adding TeO₂ into (100 鈥?x)[0.5Ag₂O 鈥?0.1B₂O₃ 鈥?0.4P₂O₅] 鈥?xTeO_2, with 0鈥?0 mol % TeO₂ glass, on the structural changes and electrical properties has been investigated. DSC and thermodilatomery were used to study their thermal behavior, structure was studied by Raman spectroscopy, and electrical properties have been studied by impedance spectroscopy over a wide temperature and frequency range. The introduction of TeO₂ as a third glass former to the glass network causes the structural transformation from TeO₃ (tp) to TeO₄ (tbp) which contributes to the changes in conductivity. The glasses with low TeO₂ content show only a slow decrease in dc conductivity with addition of TeO₂ due to the increase of the number of nonbridging oxygens, which increases the mobility of Ag⁺ ions. The steep decrease in conductivity for glasses containing more than 40 mol % TeO₂ is a result of decrease of the Ag₂O content and stronger cross-linkage in glass network through the formation of more Te鈥?sub>eqO_ax鈥揟e bonds in TeO₄ tbp units. The glasses obey ac conductivity scaling with respect to temperature, implying that the dynamic process is not temperature dependent. On the other hand, the scaling of the spectra for different glass compositions showed the deviations from the Summerfield scaling because of the local structural disorder which occurs as a result of the structural modifications in the tellurite glass network.