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Structure of the tenfold d -Al-Ni-Co quasicrystal surface

2004; American Physical Society; Volume: 69; Issue: 15 Linguagem: Inglês

10.1103/physrevb.69.153404

1550-235X

Nicola Ferralis, K. Pussi, Erik J. Cox, M. Gierer, J. Ledieu, I. R. Fisher, C. J. Jenks, M. Lindroos, R. McGrath, Renee D. Diehl,

Mineralogy and Gemology Studies

The structure of the tenfold surface of decagonal Al-Ni-Co was studied using low-energy electron diffraction (LEED) and scanning tunneling microscopy (STM). The surface region is a relaxed truncated bulk structure, having the same composition as the bulk. The outermost layer spacing is contracted by 10% relative to the bulk interlayer spacing, while the next layer spacing is expanded by 5%. A small degree of intralayer rumpling was observed within each layer. There is a one-to-one correspondence between protrusions observed in the STM images and a subset of atoms in the model structure, indicating that in-plane reconstruction is minimal.