NMR evidence for Co-Al-Co molecular groups trapped in cages of Co sub(4)Al sub(13)

We present the results of super(27)Al nuclear magnetic resonance (NMR) experiments on the phase Co sub(4)Al sub(13). These results are compared to a recent structure model [1], which demonstrates a unique bonding for Al atoms in the Co-Al-Co molecular groups. In our measurement, two super(27)Al sign...

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Bibliographic Details
Published in:Journal of alloys and compounds 2009-07, Vol.480 (1), p.141-143
Main Authors: Jeglic, P, Heggen, M, Feuerbacher, M, Bauer, B, Gille, P, Haarmann, F
Format: Article
Language:English
Subjects:
Alloys
Aluminum
Atomic structure
Bonding
Cages
Cobalt
Nuclear magnetic resonance
Quadrupole interaction
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Summary:We present the results of super(27)Al nuclear magnetic resonance (NMR) experiments on the phase Co sub(4)Al sub(13). These results are compared to a recent structure model [1], which demonstrates a unique bonding for Al atoms in the Co-Al-Co molecular groups. In our measurement, two super(27)Al signals were identified. The first one originates from Al atoms forming cages. The second signal corresponds to Al sites with exceptionally large almost axially symmetric quadrupole coupling. This finding is in perfect agreement with isolated Co-Al-Co molecular groups in accordance to Ref. [1].
ISSN:0925-8388
DOI:10.1016/j.jallcom.2008.09.168