Showing papers by "Ronan McGrath published in 2017"
01 Feb 2017
TL;DR: The dependence of surface structure formation on preparation conditions of NiAl(100) has been investigated by Scanning Tunnelling Microscopy (STM), Low Energy Electron Diffraction (LEED) and Density Functional Theory (DFT) as mentioned in this paper.
Abstract: The dependence of surface structure formation on preparation conditions of NiAl(100) has been investigated by Scanning Tunnelling Microscopy (STM), Low Energy Electron Diffraction (LEED) and Density Functional Theory (DFT). STM and LEED have been used to study the surface after sputtering, low temperature annealing (T<500K) and high temperature annealing (500K
2 citations
28 Mar 2017
TL;DR: In this paper, medium energy ion scattering (MEIS) is employed to characterize the composition and structure of the fivefold surface of the icosahedral Ag42In42Yb16 quasicrystal.
Abstract: Medium energy ion scattering (MEIS) is employed to characterize the composition and structure of the five-fold surface of the icosahedral Ag42In42Yb16 quasicrystal. The composition of the surface after sputtering is dominated by Ag and In, and when the surface is annealed at temperatures approaching 430°C, Yb is restored at the surface. The composition is that expected from the bulk structure if the surface is formed at bulk planes involving the centre of rhombic triacontahedral clusters, the building blocks of the system. Structural analysis of MEIS results are also consistent with a surface after annealing that is in close agreement with bulk truncation intersecting the cluster centre.
1 citations