The work presented here investigates the early stages of barium sulfate crystallization from aqueous solutions. By monitoring free-barium activity during the crystallization, we identified a metastable BaSO4 phase that precedes barite formation. Ex situ investigations provide direct, unambiguous experimental evidence of an amorphous BaSO4 phase in an additive-free scenario.
C. Ruiz-Agudo, D. McDonogh, J. T. Avaro, D. J. Schupp and D. Gebauer, CrystEngComm, 2020, 22, 1310 DOI: 10.1039/C9CE01555H
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