Fragility as a Measure of Dynamic Inhomogeneity of Glass Formers

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概要

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• The structure and dynamics of glass formers are spatially inhomogenous with typical scale of nanometers. The influence of this inhomogeneity on the glass transition is considered. Using Lindemann criterion of melting, the locally liquid- and solid-like particles are defined and a percolation problem for liquid and solid clusters is formulated. On the basis of percolation theory it is shown that in strong glass formers the dynamic inhomogeneity is higher than in fragile ones. The standard deviation of the lognormal spatial distribution of the mean square atomic displacements <r^2> is found to be equal to 0.1÷0.2 for fragile glass formers,0.5 for intermediate glycerol and 0.7 for strong B_2O_3. The comparison with the free volume size distribution in a fragile polymer shows a good agreeement with the predictions of the model.

• 理論物理学刊行会の論文
• 1997-06-27

著者

• Rossler Ernst

  Universityersitat Bayreuth Physikalisches Institut

• NOVIKOV Vladimir

  Universityersitat Bayreuth, Physikalisches Institut

• MALINOVSKY Valery

  Institute of Automation and Electrometry, Russian Academy of Sciences

• Novikov Vladimir

  Universityersitat Bayreuth Physikalisches Institut : Institute Of Automation And Electrometry Russia

• Malinovsky Valery

  Institute Of Automation And Electrometry Russian Academy Of Sciences

• ROSSLER Ernst

  Universityersitat Bayreuth, Physikalisches Institut

• NOVIKOV Vladimir

  Universityersitat Bayreuth, Physikalisches Institut : Institute of Automation and Electrometry, Russian Academy of Sciences

• NOVIKOV Vladimir

  University Bayreuth, Physikalisches Institut : IA&E, Russian Academy of Sciences

関連論文

• Fragility as a Measure of Dynamic Inhomogeneity of Glass Formers
• Fast Relaxation in Glasses : Relation to Free Volume and Anharmonicity

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