Crystal faces of anhydrite (CaSO4) and their preferential dissolution in aqueous solutions studied with AFM

H. Shindo; M. Kaise; H. Kondoh; C. Nishihara; H. Nozoye

doi:10.1016/0169-4332(92)90465-A

Crystal faces of anhydrite (CaSO₄) and their preferential dissolution in aqueous solutions studied with AFM

H. Shindo, M. Kaise, H. Kondoh, C. Nishihara, H. Nozoye

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

Structures of cleaved surfaces of anhydrite were studied with atomic force microscopy (AFM) before and after partial dissolution in aqueous solutions of NH₄Cl and NaHSO₄. 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.

Original language	English
Pages (from-to)	491-497
Number of pages	7
Journal	Applied Surface Science
Volume	60-61
Issue number	C
DOIs	https://doi.org/10.1016/0169-4332(92)90465-A
Publication status	Published - 1992
Externally published	Yes

ASJC Scopus subject areas

Chemistry(all)
Condensed Matter Physics
Physics and Astronomy(all)
Surfaces and Interfaces
Surfaces, Coatings and Films

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title = "Crystal faces of anhydrite (CaSO4) and their preferential dissolution in aqueous solutions studied with AFM",

abstract = "Structures of cleaved surfaces of anhydrite were studied with atomic force microscopy (AFM) before and after partial dissolution in aqueous solutions of NH4Cl and NaHSO4. 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.",

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doi = "10.1016/0169-4332(92)90465-A",

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T1 - Crystal faces of anhydrite (CaSO4) and their preferential dissolution in aqueous solutions studied with AFM

AU - Shindo, H.

AU - Kaise, M.

AU - Kondoh, H.

AU - Nishihara, C.

AU - Nozoye, H.

PY - 1992

Y1 - 1992

N2 - Structures of cleaved surfaces of anhydrite were studied with atomic force microscopy (AFM) before and after partial dissolution in aqueous solutions of NH4Cl and NaHSO4. 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.

AB - Structures of cleaved surfaces of anhydrite were studied with atomic force microscopy (AFM) before and after partial dissolution in aqueous solutions of NH4Cl and NaHSO4. 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.

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JO - Applied Surface Science

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Crystal faces of anhydrite (CaSO₄) and their preferential dissolution in aqueous solutions studied with AFM

Abstract

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