Viscosity of melts in the NaAlSiO4-KAlSiO4-SiO2 system: Configurational entropy modelling
Viscosity of melts in the NaAlSiO4-KAlSiO4-SiO2 system: Configurational entropy modelling
复制标题
NaAlSiO4-KAlSiO4-SiO2 体系中熔体的粘度:构型熵建模
DOI:
10.1016/j.jnoncrysol.2019.119635
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发表时间:
2019
影响因子:
3.5
通讯作者:
Whittington, Alan G.
中科院分区:
文献类型:
--
作者:
Robert, Geneviève;Smith, Rebecca A.;Whittington, Alan G.
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 parametersSconf(Tg) andBe, ii) Na-K mixing is the main source of additional entropy in the system based on the limited dependence ofSconf(Tg) andBeparameters on Al/(Al + Si) ratio, iii)Aelikely 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)AlSiO4system 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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