Crystal faces of anhydrite (CaSO 4) and their preferential dissolution in aqueous solutions studied with AFM

Structures of cleaved surfaces of anhydrite were studied with atomic force microscopy (AFM) before and after partial dissolution in aqueous solutions of NH 4Cl and NaHSO 4. Two crystal faces showed atom-resolved images just after cleavage, (100) and (010), of which the former was roughened by the di...

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Bibliographic Details
Published in:Applied surface science 1992, Vol.60, p.491-497
Main Authors: Shindo, H., Kaise, M., Kondoh, H., Nishihara, C., Nozoye, H.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Physics
Solid surfaces and solid-solid interfaces
Surface structure and topography
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
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Summary:Structures of cleaved surfaces of anhydrite were studied with atomic force microscopy (AFM) before and after partial dissolution in aqueous solutions of NH 4Cl and NaHSO 4. Two crystal faces showed atom-resolved images just after cleavage, (100) and (010), of which the former was roughened by the dissolution, while step structures were developed on the latter. After dissolution, steplines ran along the a- and c-axes on the (010) face, while they ran in directions inclined to these axes before. It was revealed that the arrangement of dipoles is a key factor in determining stabilities of step structures on crystal faces. On the terraces, the arrangement of oxygen atoms of the sulfate groups and calcium ions were clearly observed.
ISSN:0169-4332
1873-5584
DOI:10.1016/0169-4332(92)90465-A