IndiumV3, Chine, Analysis, bibRecord, 000374

The atomic structure of the threefold surface of the icosahedral Ag-In-Yb quasicrystal

Identifieur interne : 000374 ( Chine/Analysis ); précédent : 000373; suivant : 000375

The atomic structure of the threefold surface of the icosahedral Ag-In-Yb quasicrystal

Auteurs : RBID : Pascal:12-0449964

Descripteurs français

Pascal (Inist)
- Structure atomique, Microscopie tunnel balayage, LEED, Ordre longue distance, Dislocation vis, Structure surface, Stabilité structurale, Terminaison surface, Phase icosaédrique, Argent alliage, Quasicristal, Indium alliage, Ytterbium alliage, Lanthanide alliage.

English descriptors

KwdEn :
- Atomic structure, Icosahedral phase, Indium alloys, LEED, Long-range order, Quasicrystals, Rare earth alloys, Scanning tunneling microscopy, Screw dislocations, Silver alloys, Structure stability, Surface structure, Surface termination, Ytterbium alloys.

Abstract

We report a study of the atomic structure of the threefold icosahedral (i-)Ag-In-Yb quasicrystal surface using scanning tunneling microscopy (STM) and low energy electron diffraction (LEED). The LEED confirms that the surface exhibits quasicrystalline long-range order with the threefold symmetry expected from the bulk. The STM reveals large atomically flat terraces separated by steps of different heights. A comparison of atomically resolved STM images for the terraces and the step-height distribution with the bulk structure of isostructural i-Cd-Yb shows that the terraces are formed at bulk planes intersecting the centers of the rhombic triacontahedral clusters that make up the bulk structure of the system. However, the stability of particular terraces may be influenced by the density of atoms in the interstices (glue atoms that bind the clusters) in the terraces and also by the chemical environment in the underlying atomic plane. The surface exhibits screw dislocations, which is explained in terms of a continuous atomic density along the threefold axis.

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Le document en format XML

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<country>République populaire de Chine</country>
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<author><name sortKey="Nugent, P J" uniqKey="Nugent P">P. J. Nugent</name>
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<author><name sortKey="Shimoda, M" uniqKey="Shimoda M">M. Shimoda</name>
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<author><name sortKey="Tsai, A P" uniqKey="Tsai A">A. P. Tsai</name>
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<author><name sortKey="Sharma, H R" uniqKey="Sharma H">H. R. Sharma</name>
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<term>Rare earth alloys</term>
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<term>Screw dislocations</term>
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<term>Argent alliage</term>
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<front><div type="abstract" xml:lang="en">We report a study of the atomic structure of the threefold icosahedral (i-)Ag-In-Yb quasicrystal surface using scanning tunneling microscopy (STM) and low energy electron diffraction (LEED). The LEED confirms that the surface exhibits quasicrystalline long-range order with the threefold symmetry expected from the bulk. The STM reveals large atomically flat terraces separated by steps of different heights. A comparison of atomically resolved STM images for the terraces and the step-height distribution with the bulk structure of isostructural i-Cd-Yb shows that the terraces are formed at bulk planes intersecting the centers of the rhombic triacontahedral clusters that make up the bulk structure of the system. However, the stability of particular terraces may be influenced by the density of atoms in the interstices (glue atoms that bind the clusters) in the terraces and also by the chemical environment in the underlying atomic plane. The surface exhibits screw dislocations, which is explained in terms of a continuous atomic density along the threefold axis.</div>
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The atomic structure of the threefold surface of the icosahedral Ag-In-Yb quasicrystal

The atomic structure of the threefold surface of the icosahedral Ag-In-Yb quasicrystal

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri