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Nucleation delay in the anorthite-diopside binary system: Models and experiments
Journal of Non-Crystalline Solids ( IF 3.2 ) Pub Date : 2020-07-08 , DOI: 10.1016/j.jnoncrysol.2020.120255
Don R. Baker , Monika K. Rusiecka , Maude Bilodeau , Sun Yong Kwon

Nucleation delay was calculated for crystallization of anorthite (CaAl2Si2O8) and diopside (CaMgSi2O6) from melt, and for crystallization in 3 melts in the anorthite-diopside system using classical nucleation theory and values for equilibrium and transport properties from the literature. Calculations were compared to experiments in the literature and new experiments performed on diopside. Only one value, the activation energy of transport for diopside melt, was adjusted to fit the experiments. The activation energies, interfacial energies, and size of the structural unit of growth used for the end-member compositions were applied to calculate nucleation delays for three mixtures inside the binary. The calculated and experimental nucleation delays were within ~10x of each other, substantiating the use of classical nucleation theory to calculate nucleation delays in this system. Differences between measurements and calculations are probably due to uncertainties in equilibrium and transport properties of the system, particularly the activation energy for transport.



中文翻译:

钙长石透辉石二元体系的成核延迟:模型和实验

计算了钙长石(CaAl 2 Si 2 O 8)和透辉石(CaMgSi 2 O 6)结晶的形核延迟。),并使用经典的成核理论和文献中的平衡和输运特性值,在钙长石-透辉石体系中使3个熔体结晶。将计算结果与文献中的实验进行了比较,并对透辉石进行了新的实验。仅调整了一个值,即透辉石熔体的运输活化能,以适应实验。将用于末端成员组合物的活化能,界面能和生长的结构单元的大小用于计算二元内部三种混合物的成核延迟。计算和实验成核延迟在〜10 x之内相互证明,证实了经典成核理论在该系统中计算成核延迟的使用。测量和计算之间的差异可能是由于系统平衡和传输特性(尤其是传输的活化能)的不确定性所致。

更新日期:2020-07-09
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