Temperature Dependence of the Viscous Flow of Glass-Forming
Melts in a Broad Temperature Range

D. S. Sanditov^a,b and S. B. Munkueva^b

^aBuryat State University, ul. Smolina 24a, Ulan-Ude, 670000 Russia

^bInstitute of Physical Material Science, Russian Academy of Sciences, Siberian Branch,
ul. Sakh’yanovoi 6, Ulan-Ude, 670047 Russia

e-mail: Sanditov@bsu.ru

Received May 28, 2015

Abstract—An equation which is able to describe the temperature dependence of the viscous flow of glass-
forming melts in a broad range, including the glass-transition range and elevated temperatures has been
obtained. The equation contains three parameters; one of them is the preexponential multiplier, which is defined
by the extension of the viscosity curve to elevated temperatures (using the Lagrange polynomial), and the other
two, the delocalization energy of the atom and the transition potential of the particle, are adjustable parameters.
The delocalization energy of the atom that is determined by adjustment is in sufficient accordance with the cal-
culation according to the model of delocalized atoms. The nature of the viscous flow of glass and its melts is
discussed.

Keywords: viscous flow, model, glass and its melts, delocalization of an atom, structural change, bridge atom

DOI: 10.1134/S1087659616020140

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