O/Rh(100) p(2x2)->c(2x2) order-disorder phase transition

被引:25
作者
Baraldi, A [1 ]
Dhanak, VR [1 ]
Comelli, G [1 ]
Prince, KC [1 ]
Rosei, R [1 ]
机构
[1] UNIV TRIESTE,DIPARTMENTO FIS,I-34127 TRIESTE,ITALY
来源
PHYSICAL REVIEW B | 1996年 / 53卷 / 07期
关键词
D O I
10.1103/PhysRevB.53.4073
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
An order-disorder transition of oxygen adsorbed on the Rh(100) surface has been studied by means of spot profile analysis low-energy electron diffraction (SPA-LEED). The p(2X2)-->c(2X2) transition has been found to belong to the Ising universality class, with critical temperature 450+/-5 K. Careful consideration of the profile broadening allows the determination of the type of defect implicated in the disordering process, and it is defined in terms of a surface Burgers vector. Furthermore, the thermodynamic parameters allow an energy/unit length to be associated with these defects.
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页码:4073 / 4077
页数:5
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