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Issue 43, 2018
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BaCO3 and NH3SO3 as precursors for the hydrothermal synthesis of BaSO4

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In this study, we demonstrated that BaCO3 and NH3SO3 can be conveniently used as BaSO4 precursors. BaSO4 is obtained by treating the precursor, BaCO3, with a sulfate-containing solution, owing to the lower solubility product constant of BaSO4 compared to that of BaCO3. Using this procedure, BaSO4 particles with pseudo-cubic/prismatic morphology are obtained. In this case, temperature and reaction time have little influence on morphology, which is mainly controlled by supersaturation and sulfate concentration. Sulfate counter ion also affects the morphology, but its effect is less pronounced. The hydrolysis of NH3SO3 in the presence of soluble barium salts produces BaSO4 particles, and different kinds of morphology can be obtained, encompassing rounded and nearly spherical particles, prismatic and pseudo-cubic, irregular shapes with flat and well-developed facets, and even hopper crystals. In these syntheses, temperature and pH are playing a major role in controlling sulfamic acid hydrolysis and, therefore, supersaturation, with remarkable consequences for crystal nucleation and growth. Considering that BaSO4 finds applications in many sectors and for different purposes, the variety of particle size and shape reported in this study can potentially improve the performance of the materials in which BaSO4 particles are employed.

Graphical abstract: BaCO3 and NH3SO3 as precursors for the hydrothermal synthesis of BaSO4

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Publication details

The article was received on 14 Sep 2018, accepted on 07 Oct 2018 and first published on 08 Oct 2018

Article type: Paper
DOI: 10.1039/C8CE01581C
Citation: CrystEngComm, 2018,20, 7001-7009

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    BaCO3 and NH3SO3 as precursors for the hydrothermal synthesis of BaSO4

    F. Sordello, D. Palma, F. Pellegrino, A. Sin, M. Bruno, A. M. Rossi, C. Portesi, A. Bianco Prevot and V. Maurino, CrystEngComm, 2018, 20, 7001
    DOI: 10.1039/C8CE01581C

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