Chemical diffusion coefficient calculation of U3+ in LiCl-KCl molten salt. (August 2016)

• Record Type: Journal Article
• Authors: Zhou, Wentao; Zhang, Jinsuo
• Is Part Of: Progress in nuclear energy. Volume 91(2016:Aug.)
• Page Start: 170
• Page End: 174
• Publication Date: 2016-08
• Subjects: Self-diffusion coefficient -- Chemical diffusion coefficient -- U3+ -- LiCl–KCl molten salt -- Activity coefficient; Nuclear energy -- Periodicals; Nuclear engineering -- Periodicals; 333.7924
• DOI: 10.1016/j.pnucene.2016.04.017
• Languages: English
• ISSNs: 0149-1970

Abstract

Abstract: Self-diffusion coefficient denotes the intrinsic diffusion of elements without the chemical gradient; generally, it is different from the chemical diffusion coefficient that is used in Fick's law. However, the self-diffusion coefficient can be converted to the chemical diffusion coefficient by considering the concentration-dependent activity coefficient of solute. In this study, the multiple time origins method was applied to calculate the self-diffusion coefficient of U 3+ in LiCl-KCl eutectic salt at different temperatures and concentrations. The chemical diffusion coefficient was obtained based on the calculated results and thermodynamic theory. Calculated results show that self-diffusion coefficient decreases with concentration however chemical diffusion coefficient indicates to change little initially but appears to increase followed by decrease later within the concentration range of 0–3 at%. Highlights: Calculated the self-diffusivity of UCl3 in LiCl-KCl molten salt. Derived the chemical diffusivity of UCl3 in LiCl-KCl molten salt. Self-diffusivity decreases with concentration. Chemical-diffusivity varies little initially then shows an increase by a decrease.