Order-disorder phase transitions of oxygen on Rh(100)

被引：31

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 | 1997年 / 56卷 / 16期

关键词：

D O I：

10.1103/PhysRevB.56.10511

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The adsorption and ordering of oxygen atoms on the Rh(100) surface have been investigated by spot profile low-energy electron diffraction measurements as a function of coverage and temperature. Three oxygen induced structures were observed: p(2X2), c(2X2), and (2X2)p4g. Using the intensity and the full width at half maximum of the diffraction spots, the (2x2)p4g-->c(2x2) and c(2X2)-->(1X1) order-disorder phase transitions have been characterized and the phase diagram mapped out. The (2X2)p4g-->c(2X2) transition is assigned to the two-dimensional Ising universality. The role of the adsorbate-adsorbate interactions in the formation of the ordered phases and the kind of defects involved in the order-disorder phase transitions are discussed. [S0163-1829(97)06935-X].

引用

页码：10511 / 10517

页数：7

共 22 条

[1] O/Rh(100) p(2x2)->c(2x2) order-disorder phase transition [J].