
Abstract
The adsorption of potassium on Al(111) at 90 K and at 300 K has been investigated by low-energy electron diffraction (LEED). Although a (√3 × √3 )R30° structure is formed at each temperature, a detailed LEED analysis has revealed that the adsorbate positions are quite different and unusual in each case. At 90 K the adatoms occupy on-top sites and at 300 K they occupy substitutional sites. An irreversible phase transformation from the former to the latter structure occurs on warming to 300 K. These results are discussed in the light of recent density-functional-theory calculations.
Item Type: | Journal article |
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Faculties: | Geosciences > Department of Earth and Environmental Sciences > Crystallography and Materials Science |
Subjects: | 500 Science > 550 Earth sciences and geology |
URN: | urn:nbn:de:bvb:19-epub-5819-8 |
Language: | English |
Item ID: | 5819 |
Date Deposited: | 25. Aug 2008, 15:20 |
Last Modified: | 04. Nov 2020, 12:48 |