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Glass formation and crystallization in Li2ONa2OK2OSiO2

1995; Elsevier BV; Volume: 188; Issue: 1-2 Linguagem: Inglês

10.1016/0022-3093(95)00185-9

1873-4812

Ryo Ota, T. Wakasugi, Wataru Kawamura, B. Tuchiya, Jiro Fukunaga,

Material Dynamics and Properties

Glass-forming regions in the Li2ONa2OmSiO2 (m = 2 or 1.5) and Li2ONa2OK2OmSiO2 (m = 2 or 1.5) systems were determined with various cooling rates. Viscosity and liquidus temperature were measured. Eutectics were observed in these systems. The critical cooling rate shows a minimum and the liquidus viscosity shows a maximum. It was found that Li2ONa2OmSiO2 showed more extensive glass-forming ability than Li2OmSiO2, Na2OmSiO2 or K2OmSiO2. Li2ONa2OK2OmSiO2 shows an even larger glass-forming ability than Li2ONa2OmSiO2. The significant role of mixing entropy or liquidus viscosity in the glass-forming kinetics of mixed alkali silicate systems is recognized.