A nuclear magnetic resonance study of decagonal and related crystalline phases in Al-Cu-Co system

T. Shinohara; Ampo Sai; A. Inoue; T. Masumoto

A nuclear magnetic resonance study of decagonal and related crystalline phases in Al-Cu-Co system

T. Shinohara, Ampo Sai, A. Inoue, T. Masumoto

Center for Exploration of New Inorganic Materials

Research output: Contribution to journal › Article › peer-review

Abstract

We have measured ²⁷Al, ⁶⁵Cu and ⁵⁹Co spin-echo spectra for Al₇₀Cu_XCo_30-X(X=6, 12, 15) Al₇₃Co₂₇ and Al_76.5Co_23.5 decagonal quasicrystals and for Al_76.5Co_23.5 monoclinic compound. The line shape and peak shift suggest different local atomic configuration in these phases. It seems that the Al atoms make a quasicrystalline skeleton in the decagonal phase, and the Co atoms also enter symmetric sites three dimensionally. On the other hand, the Cu atoms occupy asymmetric sites characteristic of the decagonal phase. For the Al_76.5Co_23.5 monoclinic compound, the Al atoms occupy the one crystallographic site but the Co atoms occupy three different sites whereas the decagonal phase has a less metallic Co atom among those sites.

Original language	English
Pages (from-to)	219-223
Number of pages	5
Journal	Science Reports of the Rerearch Institutes Tohoku University Series A-Physics
Volume	42
Issue number	1
Publication status	Published - 1996 Mar 1

Keywords

Aluminum-copper-cobalt
Decagonal quasicrystal
Monoclinic structure
Nuclear magnetic resonance

ASJC Scopus subject areas

Condensed Matter Physics
Metals and Alloys

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title = "A nuclear magnetic resonance study of decagonal and related crystalline phases in Al-Cu-Co system",

abstract = "We have measured 27Al, 65Cu and 59Co spin-echo spectra for Al70CuXCo30-X(X=6, 12, 15) Al73Co27 and Al76.5Co23.5 decagonal quasicrystals and for Al76.5Co23.5 monoclinic compound. The line shape and peak shift suggest different local atomic configuration in these phases. It seems that the Al atoms make a quasicrystalline skeleton in the decagonal phase, and the Co atoms also enter symmetric sites three dimensionally. On the other hand, the Cu atoms occupy asymmetric sites characteristic of the decagonal phase. For the Al76.5Co23.5 monoclinic compound, the Al atoms occupy the one crystallographic site but the Co atoms occupy three different sites whereas the decagonal phase has a less metallic Co atom among those sites.",

keywords = "Aluminum-copper-cobalt, Decagonal quasicrystal, Monoclinic structure, Nuclear magnetic resonance",

author = "T. Shinohara and Ampo Sai and A. Inoue and T. Masumoto",

year = "1996",

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TY - JOUR

T1 - A nuclear magnetic resonance study of decagonal and related crystalline phases in Al-Cu-Co system

AU - Shinohara, T.

AU - Sai, Ampo

AU - Inoue, A.

AU - Masumoto, T.

PY - 1996/3/1

Y1 - 1996/3/1

N2 - We have measured 27Al, 65Cu and 59Co spin-echo spectra for Al70CuXCo30-X(X=6, 12, 15) Al73Co27 and Al76.5Co23.5 decagonal quasicrystals and for Al76.5Co23.5 monoclinic compound. The line shape and peak shift suggest different local atomic configuration in these phases. It seems that the Al atoms make a quasicrystalline skeleton in the decagonal phase, and the Co atoms also enter symmetric sites three dimensionally. On the other hand, the Cu atoms occupy asymmetric sites characteristic of the decagonal phase. For the Al76.5Co23.5 monoclinic compound, the Al atoms occupy the one crystallographic site but the Co atoms occupy three different sites whereas the decagonal phase has a less metallic Co atom among those sites.

AB - We have measured 27Al, 65Cu and 59Co spin-echo spectra for Al70CuXCo30-X(X=6, 12, 15) Al73Co27 and Al76.5Co23.5 decagonal quasicrystals and for Al76.5Co23.5 monoclinic compound. The line shape and peak shift suggest different local atomic configuration in these phases. It seems that the Al atoms make a quasicrystalline skeleton in the decagonal phase, and the Co atoms also enter symmetric sites three dimensionally. On the other hand, the Cu atoms occupy asymmetric sites characteristic of the decagonal phase. For the Al76.5Co23.5 monoclinic compound, the Al atoms occupy the one crystallographic site but the Co atoms occupy three different sites whereas the decagonal phase has a less metallic Co atom among those sites.

KW - Aluminum-copper-cobalt

KW - Decagonal quasicrystal

KW - Monoclinic structure

KW - Nuclear magnetic resonance

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