Tiling of the fivefold surface of Al70Pd21Mn9

[摘要] The nature of the fivefold surface of Al70Pd21Mn9 has been investigated using scanning tunnelling microscopy. From high resolution images of the terraces, a tiling of the surface has been constructed using pentagonal prototiles. This tiling matches the bulk model of Boudard et al. [J. Phys.: Cond. Matter 4 (1992) 10149], which allows us to elucidate the atomic nature of the surface. Furthermore, it is consistent with a Penrose tiling F*(((P1)r)) obtained from the geometric model based on the three-dimensional tiling F*((2F)). The results provide direct confirmation that the fivefold surface of i-Al-Pd-Mn is a termination of the bulk structure. (C) 2001 Elsevier Science B.V. All rights reserved.

[发布日期] 2001-10-20

[关键词] low energy electron diffraction (LEED);scanning tunneling microscopy;surface structure, morphology, roughness, and;topography;alloys