Abstract An atomic group model of the disordered binary alloy Rh$_{x}$--Pt$_{1-x}$ has been constructed to investigate surface segregation. According to the model, we have calculated the electronic structure of the Rh$_{x}$--Pt$_{1 - x }$alloy surface by using the recursion method when O atoms are adsorbed on the Rh$_{x}$--Pt$_{1-x }$(110) surface under the condition of coverage 0.5. The calculation results indicate that the chemical adsorption of O changes greatly the density of states near the Fermi level, and the surface segregation exhibits a reversal behaviour. In addition, when $x<0.3$, the surface on which O is adsorbed displays the property of Pt; whereas when $x>0.3$ it displays the property of Rh.
Received: 27 April 2005
Revised: 21 October 2005
Accepted manuscript online:
PACS:
68.43.-h
(Chemisorption/physisorption: adsorbates on surfaces)
Fund: Project supported by the National Natural Science Foundation of China (Grant No 50571071).
Cite this article:
Zhang Hui (张辉), Zhang Guo-Ying (张国英), Wang Rui-Dan (王瑞丹), Zhong Bo (钟博) Research of the behaviour of O chemisorption on the (110) surface of Rhx--Pt1-x alloy 2006 Chinese Physics 15 641
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