self-diffusion coefficient

https://doi.org/10.1351/goldbook.S05582
The diffusion coefficient Di∗ of species i in the absence of a chemical potential gradient. It is related to the diffusion coefficient Di by Di∗=Di ∂(ln⁡ci)∂ln⁡ai where ai is the activity of i in the solution, and ci is the concentration of i. If an isotopically labelled species (i∗) is used to study diffusion, the tracer diffusion coefficient, Di∗, is practically identical to the self-diffusion coefficient provided that the isotope effect is sufficiently small.
Source:
PAC, 1972, 31, 577. (Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry) on page 617 [Terms] [Paper]
Citation: 'self-diffusion coefficient' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.S05582 RIS BibTex EndNote
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