Bond Strength-Coordination Number Fluctuation Model of Viscosity: An Alternative Model for the Vogel-Fulcher-Tammann Equation and an Application to Bulk Metallic Glass Forming Liquids.
作者： Masahiro Ikeda , Masaru Aniya
DOI: 10.3390/MA3125246
关键词: Supercooling 、 Coordination number 、 Viscosity 、 Amorphous metal 、 Thermodynamics 、 Fragility 、 Chemistry 、 Glass transition 、 Relaxation (NMR) 、 Bond strength
摘要: The Vogel-Fulcher-Tammann (VFT) equation has been used extensively in the analysis of experimental data temperature dependence viscosity or relaxation time various types supercooled liquids including metallic glass forming materials. In this article, it is shown that our model viscosity, Bond Strength—Coordination Number Fluctuation (BSCNF) model, can be as an alternative for VFT equation. Using BSCNF was found when normalized bond strength and coordination number fluctuations structural units are equal, behaviors described by both become identical. From finding, analytical expression connects parameters to ideal transition T0 obtained. physical picture Kohlrausch-Williams-Watts function also discussed terms cooperativity form melt. An example application liquids.
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