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Calcite passivation by gypsum: the role of the cooperative effect

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Abstract

The overgrowth of gypsum (CaSO4·2H2O) on calcite (CaCO3), used as a substrate, has been obtained in order to verify the hypothesis of a crystallographic fit between the two phases. Lattice coincidences show that many orientations of gypsum with respect to calcite can occur. Experimentally, only two among these are fulfilled during the early stages of growth, the selection criterion reasonably being the adhesion energy. Moreover, it has been shown that the presence of calcium carbonate as a specific surface impurity in solution modifies the growth habit of gypsum acting on the growth rate and surface morphology of some gypsum forms. At high concentration, the calcium carbonate in solution promotes the twinning of gypsum according to the Montmartre law.

Graphical abstract: Calcite passivation by gypsum: the role of the cooperative effect

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Publication details

The article was received on 10 Apr 2017, accepted on 01 Jun 2017 and first published on 01 Jun 2017


Article type: Paper
DOI: 10.1039/C7CE00683G
Citation: CrystEngComm, 2017, Advance Article
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    Calcite passivation by gypsum: the role of the cooperative effect

    L. Pastero, R. Giustetto and D. Aquilano, CrystEngComm, 2017, Advance Article , DOI: 10.1039/C7CE00683G

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