Viscosity of many-component glasses

Abstract The effect of composition on the viscosity ( η ) of multicomponent glasses is expressed as B = ∑ i = 1 N B i x i where B = T ln ( η / η ∞ ) is the activation energy (in K), B i is the i -th component coefficient, x i is the i -th component mass fraction, T is the absolute temperature, and η ∞ ≈ 10 −5 Pa ⋅ s. The B i coefficients for three composition regions (labeled as CVS-1&2, CVS-3, and CVS-4) containing various subsets of Al 2 O 3 , B 2 O 3 , Bi 2 O 3 , CaO, Cr 2 O 3 , F, Fe 2 O 3 , K 2 O, Li 2 O, MgO, MnO, Na 2 O, NiO, P 2 O 5 , SiO 2 , UO 2 , and ZrO 2 as major components are summarized and compared. This paper presents a detailed account of the recent experimental study that generated viscosity data for the CVS-4 region of glass composition. Whereas CVS-1&2 is a well publicized dataset, CVS-3 viscosity data, though produced in 1995, are published and evaluated here for the first time. Limits of applicability of the composition models are discussed.