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NMR studies on amorphous, icosahedral, and crystalline phases

Published online by Cambridge University Press:  29 June 2016

T. Shinohara ,
A. P. Tsai  and
T. Masumoto
T. Shinohara
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980, Japan
A. P. Tsai
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980, Japan
T. Masumoto
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980, Japan
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Abstract

We report on 27Ai, 65Cu, and 51V spin-echo spectra for the amorphous phase and icosahedral quasicrystal of the Al75Cu15V10 alloy, and 27Al, 65Cu, and 55Mn spin-echo spectra for the icosahedral and crystalline phases of the Al67Cu20Mn13 alloy. The line shape and peak shift reveal different local characteristics among those phases. For the Al75Cu15V10 alloy, peak shifts of all constituent nuclei are more positive in the amorphous phase than in the icosahedral phase, indicating a different s-electron density. For the Al67Cu20Mn13 alloy, an as-quenched icosahedral phase transforms to a crystalline phase by heat treatment. Different peak shifts of 27Al and 55Mn except 65Cu between those phases have been found. It is suggested that there are Mn atoms carrying magnetic moment and that there is no difference in the electronic structure of Cu atoms between those phases.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 1 , January 1992 , pp. 62 - 67
Copyright
Copyright © Materials Research Society 1992

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