The supermolecular organization and properties of gel-like yttrium and gado
linium hydrated oxides are studied as functions of the time of precipitate
stirring with mother solution and of the pH value at the end of synthesis.
The density, the dehydration temperatures, the kinetics of dissolution in a
n acid, and the sorption ability of hydrated oxides are shown to be nonmono
tonic functions of the aforementioned parameters.