Viscosity of melts in the NaAlSiO4-KAlSiO4-SiO2 system: Configurational entropy modelling
Source abstract
Abstract
We provide new viscosity data in the system SiO2-(Na,K)AlSiO4, for the nepheline-kalsilite and jadeite-leucite joins. We present a configurational entropy model for the viscosity of melts in the system as a function of Na/(Na + K) and Al/(Al + Si) ratios. Our modelling indicates that: i) Viscosity data are reproduced well by a non-ideal, symmetrical form of the parameters Sconf(Tg) and Be, ii) Na-K mixing is the main source of additional entropy in the system based on the limited dependence of Sconf(Tg) and Be parameters on Al/(Al + Si) ratio, iii) Ae likely varies as a function of Al/(Al + Si) ratio. Melt fragility in the system increases with increasing Al/(Al + Si) ratio and is greater for Na or K end-member melts than mixed melts. The viscosity of nominally fully-polymerized melts in the SiO2-(Na,K)AlSiO4 system can be modelled through chemical mixing, without explicit consideration of the important changes in structure related to changes in K/(Na + K) and Al/(Al + Si) ratios.
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Research context
OpenAlex topics: Glass properties and applications · Material Dynamics and Properties · Clay minerals and soil interactions
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (44)
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