The existence regions of structural modifications in decagonal Al-Co-Ni

Ritsch, S.; Beeli, C.; Nissen, H.‐U.; Gödecke, Tilo; Scheffer, M.; Lück, Reinhard

doi:10.1080/095008398178048

Cited by 152 publications

(125 citation statements)

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“…There are experimental observations of two separate classes of decagonal phases [32][33][34][35][36]. They are having space groups P10 5 /mcm and P10/mmm.…”

Section: Decagonal Quasicrystalsmentioning

confidence: 99%

“…In contrast, quantification of zone rule for P10 5 /mcm types of structure requires a priori prescription of 16 (/) tt ratio. Thus the two Quasiperiodic structures having periodicity in one dimension of similar type [32][33][34][35] demand different types of hyperlattice parameters. This distinction has to be kept in mind while discussing these structures [9].…”

Section: Decagonal Quasicrystalsmentioning

confidence: 99%

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Indexing of Electron Diffraction Patterns of Icosahedral and Decagonal Phases

Mandal¹

2012

The Transmission Electron Microscope

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“…There are experimental observations of two separate classes of decagonal phases [32][33][34][35][36]. They are having space groups P10 5 /mcm and P10/mmm.…”

Section: Decagonal Quasicrystalsmentioning

confidence: 99%

Section: Decagonal Quasicrystalsmentioning

confidence: 99%

Indexing of Electron Diffraction Patterns of Icosahedral and Decagonal Phases

Mandal¹

2012

The Transmission Electron Microscope

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“…A second problem for the 10-fold decagonal surface studied here is the complexity of the structure: specifically, the crystal has symmetry [38,39], which has overall 5-fold symmetry in the plane of the (00001) surface studied here. This structure yields 10-fold symmetric diffracted beam intensities, but the associated structure factors can be no more than 5-fold symmetric.…”

Section: Introductionmentioning

confidence: 99%

“…The specific system studied here is Si adsorption on the 10-fold surface of decagonal Al 72 Co 17 Ni 11 , the Co-rich modification of the decagonal quasicrystal, which has the 5D space group symmetry [38,39], and an atomic arrangement with the symmetry of a pentagonal prism. Thus, this quasicrystal structure consists of groups of aperiodic 5-fold symmetric layers stacked in a periodic arrangement.…”

Section: Introductionmentioning

confidence: 99%

X-ray standing wave study of Si clusters on a decagonal Al-Co-Ni quasicrystal surface

et al. 2015

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Quantitative adsorption structure determinations on quasicrystals are scarce because most techniques for measuring surface structures are not well suited to the complex and infinite unit cells of quasicrystals. The normal incidence standing x-ray wave field technique presents a solution to these problems because it can be made inherently surface sensitive and does not involve extensive computational effort. We describe a method for applying this technique to adsorbates on quasicrystals, with specific application to a submonolayer of Si atoms on a decagonal Al-Co-Ni surface. We demonstrate the sensitivity of the technique to both adsorption site and geometry, leading to the conclusion that the Si atoms, which form 6-atom pentagonal clusters, have an average height of 1.77 ± 0.05 Å above pentagonal hollow sites, with a significant height variation among the Si atoms in the cluster. In particular, the central Si atom sits more deeply than the five surrounding Si atoms, which are, on average, 2.7 Å away from the central Si atom. Although this study was performed on a decagonal quasicrystal that is periodic perpendicular to the surface, we describe how the technique can be applied to cases where that is not true.

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“…Recently, various studies of the construction of the phase diagram were carried out for Al-Ni-Co involving the decagonal phase. [7][8][9] Ritsch et al 9) have constructed a precise phase diagram and shown that at least eight types of decagonal phases exist over wide temperature and composition ranges. And the structures of these types have been studied by atomic-scale observations of high-angle annular detector scanning transmission electron microscopy (HAADF-STEM), for basic Ni-rich, 10,11) S1-state, 12) type-I superstructure, 13) type-II superstructure, 14) and 5f HT 15) phases.…”

Section: Introductionmentioning

confidence: 99%

Synchrotron X-ray Studies of Phason and Phonon Strains in a Co-rich Al-Ni-Co Decagonal Quasicrystal

et al. 2004

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Peak broadening and peak shifts of Bragg reflections were studied with the synchrotron single-crystal X-ray diffraction method for an Al 72:7 Ni 8:5 Co 18:8 decagonal quasicrystal classified as the 5f state. From the Q ? and Q k dependences of the full width of half maximum (FWHM) of the Bragg reflections along the longitudinal direction, the coexistence of random phason strains with phonon strains was observed. Highresolution synchrotron X-ray measurements could present quantitative estimations of these strains. The value of the random phason strain component is 0:0054 $ ( À11 . The asymmetrical broadening due to the phonon strain shows that the single crystal may be constructed with two kinds of grains that have A 5D values of 0.6273 and 0.6265 nm.

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The existence regions of structural modifications in decagonal Al-Co-Ni

Cited by 152 publications

References 0 publications

Indexing of Electron Diffraction Patterns of Icosahedral and Decagonal Phases

Indexing of Electron Diffraction Patterns of Icosahedral and Decagonal Phases

X-ray standing wave study of Si clusters on a decagonal Al-Co-Ni quasicrystal surface

Synchrotron X-ray Studies of Phason and Phonon Strains in a Co-rich Al-Ni-Co Decagonal Quasicrystal

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