From disorder to order: evidence of stable ion clusters

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Evidence for an amorphous to crystalline transition
In this HOT Article, Franca Jones suggests the existence of highly disordered clusters that form prior to crystallization of barite and gypsum, based on  Fourier-Transform infra-red (FTIR) spectra of saturated solutions as they crystallize.  Jones reports the  evolution of various mineral phases prior to the appearance of the crystalline mature product and in the case of barite, shows that the FTIR evidence is strongly supported by electron diffraction. The role of water in the process is also investigated… 

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Infrared investigation of barite and gypsum crystallization: Evidence for an amorphous to crystalline transition
Franca Jones
CrystEngComm, 2012, Advance Article
DOI: 10.1039/C2CE25918D 

Also of interest may be: 

Barium sulfate crystallization dependence on upper rim calix[4]arene functional groups
Andrew Baynton, Mark I. Ogden, Colin L. Raston and Franca Jones
CrystEngComm, 2012, 14, 1057-1062
DOI: 10.1039/C1CE06083J

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