A comment on the growth unit of Rochelle salt crystal growing in its aqueous solution

The growth rates of Rochelle salt crystals were precisely measured along their null c null directions as a function of the concentration gradient by the moire fringe method [J. Crystal Growth 51 (1981) 113]. The diffusion coefficient determined from the rate and gradient was in good agreement with the coefficients obtained by the ordinarily used methods under the assumption that the majority of the units transported were monomolecular...