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  • 标题:Viscosity of glass-forming liquids
  • 本地全文:下载
  • 作者:John C. Mauro ; Yuanzheng Yue ; Adam J. Ellison
  • 期刊名称:Proceedings of the National Academy of Sciences
  • 印刷版ISSN:0027-8424
  • 电子版ISSN:1091-6490
  • 出版年度:2009
  • 卷号:106
  • 期号:47
  • 页码:19780-19784
  • DOI:10.1073/pnas.0911705106
  • 语种:English
  • 出版社:The National Academy of Sciences of the United States of America
  • 摘要:The low-temperature dynamics of ultraviscous liquids hold the key to understanding the nature of glass transition and relaxation phenomena, including the potential existence of an ideal thermodynamic glass transition. Unfortunately, existing viscosity models, such as the Vogel-Fulcher-Tammann (VFT) and Avramov-Milchev (AM) equations, exhibit systematic error when extrapolating to low temperatures. We present a model offering an improved description of the viscosity-temperature relationship for both inorganic and organic liquids using the same number of parameters as VFT and AM. The model has a clear physical foundation based on the temperature dependence of configurational entropy, and it offers an accurate prediction of low-temperature isokoms without any singularity at finite temperature. Our results cast doubt on the existence of a Kauzmann entropy catastrophe and associated ideal glass transition.
  • 关键词:modeling ; supercooled liquids ; configurational entropy ; relaxation
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