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https://scholarbank.nus.edu.sg/handle/10635/76422
DC Field | Value | |
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dc.title | Kinetic Constraints in the Phase Transitions of Chemisorbed Carbon Monoxide on Co{1010} at High Coverages | |
dc.contributor.author | Gu, J. | |
dc.contributor.author | Yeo, Y.Y. | |
dc.contributor.author | Sim, W.S. | |
dc.contributor.author | King, D.A. | |
dc.date.accessioned | 2014-06-23T05:42:35Z | |
dc.date.available | 2014-06-23T05:42:35Z | |
dc.date.issued | 2000-05-18 | |
dc.identifier.citation | Gu, J.,Yeo, Y.Y.,Sim, W.S.,King, D.A. (2000-05-18). Kinetic Constraints in the Phase Transitions of Chemisorbed Carbon Monoxide on Co{1010} at High Coverages. Journal of Physical Chemistry B 104 (19) : 4684-4689. ScholarBank@NUS Repository. | |
dc.identifier.issn | 10895647 | |
dc.identifier.uri | http://scholarbank.nus.edu.sg/handle/10635/76422 | |
dc.description.abstract | The high-coverage structures of CO on Co{1010} have been investigated in detail using reflection - absorption infrared spectroscopy (RAIRS) and low-energy electron diffraction (LEED) over the temperature range from 100 to 250 K. This has revealed a curious anomaly. As the coverage is increased above 0.5 monolayer (ML) at temperatures below 250 K, a p(2x1) phase, with atop CO, is incompletely converted to a p(2x1)g phase with a local coverage of 1 ML and CO in bridge sites. At temperatures below 180 K, one-third of the surface is converted into the energetically most stable structure, c(2x6), with CO in two types of bridge sites, local coverage 1.17 ML, and the remaining two-thirds remains in the p(2x1)g phase. On cooling to 100 K, the stable c(2x6) phase is unchanged, still occupying one-third of the surface, and the p(2x1)g phase is transformed to a p(6x1)g phase, driven by vibrational entropy. At these low temperatures, this phase transition occurs between two ordered phases that are both metastable with respect to the high-coverage c(2x6) phase. This is attributed to kinetic constraints within the close-packed adsorbed overlayer associated with frozen-in antiphase domains. | |
dc.source | Scopus | |
dc.type | Article | |
dc.contributor.department | CHEMISTRY | |
dc.description.sourcetitle | Journal of Physical Chemistry B | |
dc.description.volume | 104 | |
dc.description.issue | 19 | |
dc.description.page | 4684-4689 | |
dc.description.coden | JPCBF | |
dc.identifier.isiut | NOT_IN_WOS | |
Appears in Collections: | Staff Publications |
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