Abstract
The transfer of kinetic units (atoms or groups of atoms) in amorphous materials from one quasiequilibrium position to another quasi-equilibrium position is governed by the fluctuations of both the energy and the entropy of the system. In the glass transition range of liquids, the entropy mechanism plays a dominant role: fluctuations of the particle packing appear to be more significant than the accumulation of the energy. At high temperatures above the glass transition range, the energy mechanism plays a decisive role. The physical meaning of the parameter involved in the Bartenev equation relating the relaxation time to the cooling rate at the glass transition temperature is discussed. A technique is proposed for calculating this parameter with allowance made for the temperature dependence of the activation energy in the liquid-glass transition range. A variant of the modification of this equation is considered.
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Original Russian Text © B.D. Sanditov, S.Sh. Sangadiev, D.S. Sanditov, 2007, published in Fizika i Khimiya Stekla.
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Sanditov, B.D., Sangadiev, S.S. & Sanditov, D.S. Relaxation time and cooling rate of a liquid in the glass transition range. Glass Phys Chem 33, 445–454 (2007). https://doi.org/10.1134/S1087659607050021
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DOI: https://doi.org/10.1134/S1087659607050021