Einstein equation

https://doi.org/10.1351/goldbook.ET06759
In its most general form, the @[email protected] equation relates the atomic @[email protected] \(b_{i}\) of a species \(i\) to the @[email protected] \(D_{i}\): i.e., \(D_{i}=k\ T\ b_{i}\).
Source:
PAC, 1999, 71, 1307. (Definitions of Terms for Diffusion in the Solid State) on page 1314 [Terms] [Paper]