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The Ostwald Rule of Stages
Author(s) -
Nývlt Jaroslav
Publication year - 1995
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170300402
Subject(s) - ostwald ripening , aqueous solution , crystallization , recrystallization (geology) , citric acid , ferrous , chemistry , thermodynamics , materials science , geology , physics , organic chemistry , paleontology
Crystallization from solutions often starts in such a way that thermodynamically unstable phases appear first followed by recrystallization to thermodynamically stable phases. This empirical observation, called as Ostwald's rule of stages, is explamed here on the basis of structure changes of solutions. Experiments supporting this explanation have been carried out with aqueous solutions of citric acid, sodium hydrogen phosphate and ferrous sulphate, respectively.