Collect. Czech. Chem. Commun. 1984, 49, 2045-2049

Probable mechanism of the effect of thermal history of solution on the metastable zone width

Jaroslav Nývlt

Institute of Inorganic Chemistry, Czechoslovak Academy of Sciences, 160 00 Prague 6


The metastable zone width of an aqueous solution of FeSO4 has been measured as a function of the temperature of solution overheating. For the solution overheated to a temperature lower than that of hydrate transformation, the data fit to a continuous, smooth curve, while points obtained in overheating the solution above the hydrate transformation temperature lie distinctly above the extension of the curve. Of hypotheses advanced in the literature to explain the thermal history of solution, only that based on redistribution of subcritical cluster sizes of crystallizing substance seems compatible with the observation.