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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Electrical conductivity and dielectric properties of Bi_2O _3-GeO_2-PbO-MoO_3 glasses
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Electrical conductivity and dielectric properties of Bi_2O _3-GeO_2-PbO-MoO_3 glasses

机译：Bi_2O _3-GeO_2-PbO-MoO_3玻璃的电导率和介电性能

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摘要

Glasses having compositions 40Bi_2O_3-20GeO _2-(40-x)PbO-xMoO_3 (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 MoO_3 content in such glasses. This may be due to the lower molecular weight MoO_3 is substituted by a higher molecular weight PbO. The dc conductivity decreases while the activation energy increases with the increase of the MoO_3 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 σ_(ac), over a range of frequency 0.12-100 kHz and temperature 325-650 K and frequency exponent s) of these glasses have been studied.
机译：通过常规的熔融淬火技术制备具有成分40Bi_2O_3-20GeO_2-（40-x）PbO-xMoO_3（其中x ＝ 3、6、9、12和15mol％）的玻璃。随着这种玻璃中MoO_3含量的增加，密度（d）逐渐降低。这可能是由于较低的分子量MoO_3被较高的分子量PbO取代了。随着MoO_3含量的增加，直流电导率降低，而活化能增加。本发明玻璃的直流电导率在很大程度上取决于电子，它们之间的平均距离R取决于Mo离子之间的距离。根据小极化子跳跃模型对电性能进行了分析。从实验数据与该模型的拟合中获得的参数是合理的，并且与玻璃成分一致。传导归因于小极化子的非绝热跳跃。已经研究了这些玻璃的介电特性（常数ε，损耗tanδ，交流电导率σ_（ac），在频率0.12-100 kHz，温度325-650 K和频率指数s的范围内）。

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