Structure determination of quasicrystals

Boissieu, M. de; Takakura, Hiroyuki; Gómez, Cesar Pay; Yamamoto, Akio; Tsai, A.‐P.

doi:10.1080/14786430601185093

Cited by 12 publications

(8 citation statements)

References 39 publications

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“…We propose, as previously suggested [26] to explain the low concentration of Sc in i-Sc 12 Zn 88 [2], that the RT clusters in i-R-Cd remain intact but the "glue" filling the gaps between the RT clusters is deficient in R ions (e.g. the complete absence of R ions in the glue would lead to a composition of RCd 8.6 ).…”

supporting

confidence: 68%

A family of binary magnetic icosahedral quasicrystals based on rare earths and cadmium

et al. 2013

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Examples of stable binary icosahedral quasicrystals are relatively rare, and at present there are no known examples featuring localized magnetic moments. These would represent an ideal model system for attaining a deeper understanding of the nature of magnetic interactions in aperiodic lattices. Here we report the discovery of a family of at least seven rare earth icosahedral binary quasicrystals, i-R-Cd (R = Gd to Tm, Y), six of which bear localized magnetic moments. Our work highlights the importance of carefully motivated searches through phase space and supports the proposal that, like icosahedral Sc12Zn88 (ref. ), binary quasicrystalline phases may well exist nearby known crystalline approximants, perhaps as peritectically forming compounds with very limited liquidus surfaces, offering very limited ranges of composition/temperature for primary solidification.

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confidence: 68%

A family of binary magnetic icosahedral quasicrystals based on rare earths and cadmium

et al. 2013

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“…The high-density regions are clearly separated by gaps ͑lower density regions͒, which is consistent with the electron density analysis of the same system reported by de Boissieu at el. 22 The Yb layers are always associated with high-density regions and they are separated by 0.25 nm. The majority of these Yb layers intersect the RTH cluster centers.…”

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confidence: 99%

Structure of the fivefold surface of the Ag-In-Yb icosahedral quasicrystal

et al. 2009

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The surface structural study of an icosahedral ͑i͒ quasicrystal of the Cd-Yb family is presented. Comparison of bias-dependent scanning tunneling microscopy data from the fivefold surface of i-Ag-In-Yb with the refined bulk model of isostructural i-Cd-Yb indicates that surfaces are formed at bulk planes intersecting the center of the rhombic triacontahedral clusters, the building blocks of the Cd-Yb family quasicrystals. These observations open up the possibility of the use of this material as a template for epitaxial structures.

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“…The Laue measurements confirmed that the samples were single grain and that the surfaces were subject to a miscut. The Ag-In-Gd sample has a miscut resulting in a surface at (10 • , 4 • ) from the (100) plane (a magnitude of 10.8…”

Section: B Observation and Identification Of Facetsmentioning

confidence: 99%

“…This makes it possible to unambiguously compare the surface structure with a wellestablished model of the bulk. Finally, the structure of these systems is based on rhombic triacontahedral (RTH) clusters [9,10], which are different from the Mackay and Bergman clusters of the Al-based phases. Thus, study of these systems extends the scope of surface studies beyond the commonly used Al-based phases.…”

Section: Introductionmentioning

confidence: 99%

Surface structure of the Ag-In-(rare earth) complex intermetallics

et al. 2016

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We present a study of the surface structure of the Ag-In-RE (RE: rare-earth elements Gd, Tb, and Yb) complex intermetallics using scanning tunneling microscopy and low-energy electron diffraction. The surface of the Ag-In-Yb approximant prepared by sputter-annealing methods under ultrahigh-vacuum conditions produces a flat (100) surface with no facets. However, the Ag-In-Gd and Ag-In-Tb 1/1 approximants, which have a surface miscut of about 12• relative to the (100) plane, develop surface facets along various crystallographic directions. The structure of each facet can be explained as a truncation of the rhombic triacontahedral clusters, i.e., the main building blocks of these systems. Despite their differences in atomic structure, symmetry, and density, the facets show common features. The facet planes are In rich. The analysis of the nearest-neighbor atom distances suggests that In atoms form bonds with the RE atoms, which we suggest is a key factor that stabilizes even low-density facet planes.

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Structure determination of quasicrystals

Cited by 12 publications

References 39 publications

A family of binary magnetic icosahedral quasicrystals based on rare earths and cadmium

A family of binary magnetic icosahedral quasicrystals based on rare earths and cadmium

Structure of the fivefold surface of the Ag-In-Yb icosahedral quasicrystal

Surface structure of the Ag-In-(rare earth) complex intermetallics

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