On the critical displacement of excited kinetic units in liquids and glasses

• Published in: Glass physics and chemistry Vol. 33; no. 1; pp. 37 - 43
• Main Authors: Sanditov, D. S., Badmaev, S. S., Mel’nichenko, T. N., Sanditov, B. D.
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer Nature B.V 01-02-2007
• Subjects: Glass
• ISSN: 1087-6596; 1608-313X
• DOI: 10.1134/S1087659607010051

The critical displacement of an atom (a group of atoms) in inorganic glasses Δr ^sub m^, which corresponds to the maximum of the interatomic attractive force, is calculated using available data on the surface tension and elastic constants. It is found that the critical atomic displacement Δr ^sub m^ is close in order of magnitude to the linear dimension of the activation volume of atomic excitation v ^sub h^ ^sup 1/3^ for glasses in the As-S and Ge-As-S systems with a chain structure and is considerably less than the value of v ^sub h^ ^sup 1/3^ for alkali silicate glasses and glasses in the Cd-As system with a structure involving ionic sublattices. A relationship for calculating the activation volume of the atomic excitation from data on the glass transition temperature and elastic constants is derived within the model of an excited state.[PUBLICATION ABSTRACT]