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Bond strength-coordination number fluctuations and the fragility of some ion-conducting oxide and chalcogenide glass-forming liquids

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Abstract

The concept of fragility has been used widely to characterize the temperature dependence of the viscosity of glass-forming liquids. According to a model proposed by one of the authors, the fragility is determined by the relaxation of structural units that form the melt and is described in terms of the bond strength, coordination number, and their fluctuations. In the present contribution, the model is applied to investigate the temperature dependence of the viscosity of some ion-conducting oxide and chalcogenide glass-forming liquids. From the analysis of the model, physical quantities such as the number of bonds that must be broken to observe the viscous flow are obtained. The analysis suggests also that good ionic conductors have an intermediate value of fragility.

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Acknowledgements

This work was supported in part by a Grant-in-Aid for Scientific Research from the Japan Society for the promotion of Science (No. 19560014) and by a Grant-in-Aid for Scientific Research on Priority Area, “Nanoionics (439)” from the Ministry of Education, Culture, Sports, Science and Technology of Japan.

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Authors and Affiliations

  1. Department of Physics, Graduate School of Science and Technology, Kumamoto University, Kumamoto, 860-8555, Japan

    Masaru Aniya & Masahiro Ikeda

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  1. Masaru Aniya
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  2. Masahiro Ikeda
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Correspondence to Masaru Aniya.

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Aniya, M., Ikeda, M. Bond strength-coordination number fluctuations and the fragility of some ion-conducting oxide and chalcogenide glass-forming liquids. Ionics 16, 7–11 (2010). https://doi.org/10.1007/s11581-009-0380-y

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  • DOI: https://doi.org/10.1007/s11581-009-0380-y

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