Structure of a W–(AlCoNi) crystalline phase related to Al–Co–Ni decagonal quasicrystals, studied by single crystal X-ray diffraction

Sugiyama, Kazumasa; Nishimura, Sinya; Hiraga, Kenji

doi:10.1016/s0925-8388(02)00135-4

Cited by 58 publications

(48 citation statements)

References 10 publications

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“…This composition is close to the Co-rich decagonal phases, and to that of the sample used in this LEED study, Al 73 Co 17 Ni 10 [5]. The structure found using X-ray diffraction is nearly orthorhombic (the b angle was measured to be 90.05 rather than the orthorhombic 90 ) with unit cell lengths of a ¼ 39.668 A, b ¼ 23.392 A and c ¼ 8.158 A [4]. Along the c direction, the structure consists of four planes per unit cell, having alternately flat (A) and buckled (B) atomic structures in an ABA 0 B 0 sequence.…”

Section: Introductionsupporting

confidence: 70%

“…The most stable one has a composition of Al 71.70 Co 20.75 Ni 7.55 which is very close to the crystal studied with X-ray diffraction, Al 71.8 Co 21.1 Ni 7.1 [4]. This composition is close to the Co-rich decagonal phases, and to that of the sample used in this LEED study, Al 73 Co 17 Ni 10 [5].…”

Section: Introductionsupporting

confidence: 70%

“…The initial positions of the atoms used in the U structure model are based on those determined by the bulk X-ray diffraction study of the Co-rich W phase [4]. The actual starting values used here are the relaxed coordinates from an ab initio study of the periodic Al 71.70 Co 20.75 Ni 7.55 bulk structure [3], which differ only slightly from the X-ray diffraction coordinates.…”

Section: Resultsmentioning

confidence: 99%

“…A closer approximation to quasicrystalline Al--Co--Ni is the so-called W-(AlCoNi) approximant, which has 534 atoms per orthorhombic unit cell. An example of this structure occurs near the Co-rich structure in the Al--Co--Ni phase diagram and was the subject of an X-ray diffraction study [4]. This paper presents a LEED analysis using that experimentallydetermined periodic structure as a model for the surface structure of quasicrystalline d-Al--Co--Ni.…”

Section: Introductionmentioning

confidence: 99%

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LEED analysis of the surface structure of decagonal Al–Co–Ni using its W-approximant as a model structure

Pussi

Diehl²

2009

Zeitschrift Für Kristallographie - Crystalline Materials

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Quasicrystal / Low-energy electron diffraction / Surface structure Abstract. The analysis of low-energy electron diffraction (LEED) intensities from quasicrystal surfaces requires the use of periodic model structures that contain the same structure features as the quasicrystal. In this paper, we present the analysis of LEED data from 10-fold decagonal Al--Co--Ni using the W approximant structure as the model. A preference was found for an Al-rich termination of the surface, with very little relaxation of the surface planes relative to the bulk structure. This result is similar to the results of an ab inito calculation of a similar surface structure [1]. The results are compared from earlier analyses of the same data using different structure models [2].

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Section: Introductionsupporting

confidence: 70%

Section: Introductionsupporting

confidence: 70%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

LEED analysis of the surface structure of decagonal Al–Co–Ni using its W-approximant as a model structure

Pussi

Diehl²

2009

Zeitschrift Für Kristallographie - Crystalline Materials

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“…Of the various crystalline phases noticed in the samples, the ε-phases have structures similar to that of the Al 3 Pd (ε 6 -phase), which is an important crystalline approximant of decagonal quasicrystals with a period of 1.6 nm [2]. W -AlCoPd containing approximately 5 at.% Pd exhibits cell parameters similar to those of W -AlCoNi [3], and its structural characteristics are useful for understanding those of the columnar unit in the decagonal phase with a periodicity of 0.8 nm. On the other hand, a few crystalline phases probably associated with the icosahedral phase have also been found in this AlPdCo system.…”

Section: Introductionmentioning

confidence: 86%

F-AlCoPdGe Alloy with Three Types of Pseudo-Mackay Clusters

et al. 2014

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The structure of an F -AlCoPdGe alloy was determined by single-crystal X-ray diraction analysis: space group P a3 (No. 205), Pearson symbol cP 1128-142.4, a = 24.4338(4) Å; R1 = 0.0526 for the observed 5106 reections with F0 > 4.0σ(F0). The F -AlCoPdGe alloy exhibited three types of pseudo-Mackay clusters (pMCs). The rst shell of the Co(13)-pMC at 24d indicated a coordination polyhedron typically found in AlCo binary approximants; the second shell was a combination of an M icosahedron and an Al icosidodecahedron, where M is a mixed site of Pd and/or Co. The rst shell of the Co(14)-pMC at 4b consisted of 20 partially occupied Al positions arranged in a dodecahedral fashion; its second shell was also composed of an M icosahedron and an Al icosidodecahedron. The rst shell of the Al(18)-pMC at 4a consisted of a combination of an M cube and an Al octahedron, resulting in the rhombic dodecahedral arrangement; its outer shell structure was similar to those of the other pMCs. The structure of the F -AlCoPdGe phase comprised an arrangement of these three types of pMCs together with interstitially placed Al icosahedra around the Pd/Al(1) and Pd/Al(2) sites.

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