A density scaling conjecture for aging glasses

The aging rate of glasses has traditionally been modeled as a function of temperature, T, and fictive temperature, while density, p, is not explicitly included as a parameter. However, this description does not naturally connect to the modern understanding of what governs the relaxation rate in equilibrium. In equilibrium, it is well known that the relaxation rate, y(eq), depends on temperature and density. In addition, a large class of systems obeys density scaling, which means the rate specifically depends on the scaling parameter, gamma = e(p)/T, where e(p) is a system specific function. This paper presents a generalization of the fictive temperature concept in terms of a fictive scaling parameter, gamma(fic), and a density scaling conjecture for aging glasses in which the aging rate depends on gamma and gamma(fic). Published under an exclusive license by AIP Publishing.

Automated summary

Traditionally, the aging rate of glasses has been modeled based on temperature and fictive temperature, while density is not explicitly included. However, in equilibrium, the relaxation rate of glasses depends on both temperature and density. This paper presents a generalization of the fictive temperature concept and proposes a density scaling conjecture for aging glasses.