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Fragility and compressibility at the glass transition

U. Buchenau·A. Wischnewski
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Abstract

Isothermal compressibilities and Brillouin sound velocities from the literature allow to separate the compressibility at the glass transition into a high-frequency vibrational and a low-frequency relaxational part. Their ratio shows the linear fragility relation discovered by x-ray Brillouin scattering [1], though the data bend away from the line at higher fragilities. Using the concept of constrained degrees of freedom, one can show that the vibrational part follows the fragility-independent Lindemann criterion; the fragility dependence seems to stem from the relaxational part. The physical meaning of this finding is discussed. [1] T. Scopigno, G. Ruocco, F. Sette and G. Monaco, Science 302, 849 (2003)

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U. Buchenau, A. Wischnewski. 2004-07-06. Fragility and compressibility at the glass transition. https://doi.org/10.1103/physrevb.70.092201

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