Ana Cándida Martins Rodrigues, LaMaV, Universidad de San Carlos, Brasil.
Lunes 2 de octubre a las 12h, salón de actos del ICV
Structural relaxation of glass is an intriguing phenomenon from a scientific point of view, which also bears important technological applications, for example in annealing processes, or chemical straightening by ion exchange. Glass relaxation has been experimentally demonstrated by measuring the effect of isothermal aging on different properties, such as density, refractive index, or viscosity. In this talk, we will present results from the variation of isothermal ionic conductivity in silver phosphate (AgPO3) and lithium disilicate (Li2Si2O5) glasses. In both cases, the relaxation phenomenon was well described by the Kohlrausch stretched exponential equation. For the same study temperature (Ts), AgPO3 shows faster relaxation when measured above the initial fictive temperature (Tf), i.e., when the aging experiment is conducted at Ts