THE STRUCTURE OF HEMATITE (α-FE2O3) (001) SURFACES IN AQUEOUS MEDIA: SCANNING TUNNELING MICROSCOPY AND RESONANT TUNNELING CALCULATIONS OF COEXISTING O AND FE TERMINATIONS
- DSpace Home
- →
- Геология России
- →
- ELibrary
- →
- View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.
dc.contributor.author | Eggleston C.M. | |
dc.contributor.author | Stack A.G. | |
dc.contributor.author | Higgins S.R. | |
dc.contributor.author | Bice A.M. | |
dc.contributor.author | Boese S.W. | |
dc.contributor.author | Pribyl R.D. | |
dc.contributor.author | Nichols J.J. | |
dc.contributor.author | Rosso K.M. | |
dc.date.accessioned | 2021-11-27T03:01:33Z | |
dc.date.available | 2021-11-27T03:01:33Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=14038657 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2003, 67, 5, 985-1000 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/32508 | |
dc.description.abstract | The iron oxide–water interface is of interest not only in geochemical and environmental processes, but also in fields ranging from corrosion to photocatalysis. The structure of α-Fe2O3 (001) surfaces is not fully understood, and questions have arisen recently concerning different terminations of (001) terraces; a so-called Fe-termination is expected, but under some conditions an O-termination may also be possible. Ultra-high vacuum (UHV) scanning tunneling microscope (STM) studies report evidence for an O-termination in coexistence with an Fe-termination, but other studies find no evidence for an O-termination. Molecular mechanics studies suggest that an O-termination should be possible in an aqueous environment. An O-termination could result from dissolution; if Fe atoms were to dissolve from an Fe-termination, an O-termination would presumably result (and vice-versa). We imaged hematite (001) surfaces in air and aqueous solution using STM. To aid interpretation of the images, we use a resonant tunneling model (RTM) parameterized using ab initio calculations.Our STM and RTM results are consistent with mixed O- and Fe-terminated (001) surfaces. For acid-etched surfaces we find evidence for a periodic (with wavelength of 2.2 ± 0.2 nm) arrangement of nominal O- and Fe-terminated domains. Two different borders between domains should occur, one in which the Fe-termination is high relative to the O-termination, and the reverse. The different domain borders have significantly different heights, consistent with RTM calculations. This agreement allows us to conclude that the Fe-termination is topographically high on most terraces. Surface domains are observed in aqueous solutions at the atomic scale, and appear to be very unreactive on tens-of-seconds time scales at pH 1. | |
dc.subject | Hematite | |
dc.title | THE STRUCTURE OF HEMATITE (α-FE2O3) (001) SURFACES IN AQUEOUS MEDIA: SCANNING TUNNELING MICROSCOPY AND RESONANT TUNNELING CALCULATIONS OF COEXISTING O AND FE TERMINATIONS | |
dc.type | Статья |
Files in this item
This item appears in the following Collection(s)
-
ELibrary
Метаданные публикаций с сайта https://www.elibrary.ru