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Study of the Dissolution of the Barium Sulfate (001) Surface with Hydrochloric Acid by Atomic Force Microscopy

✍ Scribed by Kang-Shi Wang; Roland Resch; Bruce E. Koel; Patrick J. Shuler; Yongchun Tang; Huey-jyh Chen; Teh Fu Yen

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 228 KB
Volume: 219
Category: Article
ISSN: 0021-9797
DOI: 10.1006/jcis.1999.6473

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✦ Synopsis

Noncontact atomic force microscopy (NC-AFM) has been used to investigate the morphological changes of a freshly cleaved (001) surface of barium sulfate (barite) etched with an aqueous solution of 0.1 M HCl at room temperature. Shallow triangular etch pits with a height of 3.6 Å were developed in atomically flat (001) terraces. The etching of the surface was found to proceed in a layer-by-layer dissolution process. Because the crystal structure of barite exhibits a two-fold screw axis parallel to the c axis, "alternating" etch pits were formed, with any two consecutive etch pits pointing opposite to each other. These etch pits became deeper and more elongated along the b axis with time.

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