Isothermal calorimetric studies of crystal nucleation and growth processes in the aqueous LiCl-H2O system and the model glass-forming ionic system Ca(NO3)2-KNO3 have been investigated. For LiCl-H2O it is demonstrated that the results obtained by using emulsion samples, which protect against heterogeneous nucleation artifacts, can be reproduced by using bulk samples. For the Ca(NO3)2-KNO3 system some interference from heterogeneous nucleation is observed, but results of character rather similar to those in LiCl-H2O are obtained. These are refined by the use of two different two-step observation schedules which probe the relation between nucleation-dominated and growth-dominated regimes. The results make it possible to compare the crystallization kinetics in aqueous solutions and ionic melts and contrast them with molten fluoride systems of previous studies.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry