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Ultrasonic studies on network structure of ternary TeO2–WO3–K2O glass system

“…These have been extended to describing the viscosity of inorganic glasses and their structural features using mathematical formulation of WilliamsLandel-Ferry (WLF) theory [16]. Sanditov and Tsydypov [17] suggest that, formation and migration of micro-cavities in silicate glasses are associated with the deformation of the siliconoxygen network as a result of thermal fluctuations. The proportion of free volume at the glass transition temperature (fugacity) characterizes the degree of rigidity of the glass network.…”

“…The proportion of free volume at the glass transition temperature (fugacity) characterizes the degree of rigidity of the glass network. Fugacity is calculated from the equation given by [17] as…”

Characterization of some lead vanadate glasses

“…The viscosity of the inorganic glasses and their structural features can be described using mathematical formulation proposed by Ferry [52]. Sanditov et al [53] suggested that, formation and migration of micro-cavities in silicate glasses are associated with the deformation of the silicon-oxygen network as a result of thermal fluctuations. The proportion of free volume at the glass transition temperature (fugacity) characterizes the degree of rigidity of the glass network.…”

Grüneisen parameter and elastic constants of crystals and vitreous bodies

“…The elementary volume v h = πr 2 Δr m necessary for the critical displacement of the excited particle is proportional to the elementary shear volume (the volume of viscous flow activation) v η ~ δ 3 N A , and the energy of critical atom displacement h ε is proportional to the work done by the elementary shear on the viscous flow ε h ~ ΔU = GV [24,25].…”