ATOMIC ROUGHNESS OF STEPS OF IR(001) LAYERS

作者：CHEN CL^*; TSONG TT

来源：Surface Science, 1995, 336(1-2): L735-L740.

DOI：10.1016/0039-6028(95)00562-5

• FIELD EVAPORATION
• FIELD ION MICROSCOPY
• IRIDIUM
• SURFACE DIFFUSION
• SURFACE ROUGHENING
• SURFACE STRUCTURE, MORPHOLOGY, ROUGHNESS, AND TOPOGRAPHY

With the field ion microscope, we have studied the energetics of atomic processes on the Ir(001) surface. We have found that lattice step atoms start to move along the [110] steps around 400 K. In thermal equilibrium, the top surface layer becomes a square with its four sides parallel to the [110] directions. At higher temperatures (500 K or higher), step atoms start to dissociate from edge sites, kink sites, ledge sites and other sites randomly so that one-dimensional step roughening occurs. By measuring the mean square deviation of the step heights at various temperatures, the kink energy for the Ir(001) steps can be derived to be 1.36 eV.

• 出版日期1995-8-1
• 单位中国科学院物理研究所