Disparity in the concentration dependence of interdiffusion coefficient under 1D and 2D diffusion interface migration

• Published in: Results in physics Vol. 38; p. 105660
• Main Authors: Olaye, O., Ojo, O.A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-07-2022; Elsevier
• Subjects: Concentration; Experimental; Geometry; Interdiffusion coefficient; Theoretical; Geometry; Concentration; Interdiffusion coefficient; Experimental; Theoretical
• ISSN: 2211-3797; 2211-3797
• DOI: 10.1016/j.rinp.2022.105660

•Prior to this study D(C) was assumed to be a geometry independent material constant.•This assumption is investigated using 1D and 2D diffusion interface migration systems.•Theoretical and experimental results show that D(C) can change with diffusion geometry.•The indiscriminate use of D(C) from 1D geometry can lead to prediction errors in 2D.
The common assumption that the concentration dependence of interdiffusion coefficient (D(C)) is an isothermally constant material parameter that is independent of geometry is theoretically and experimentally investigated, using the cases of 1D and 2D diffusion interface migration in the planar and cylindrical systems, respectively. The theoretical results, which are experimentally validated, show that the D(C) can change with diffusion geometry, in contrast to what is commonly assumed.