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EXAFS Studies on Nanocrystalline Materials with Doped Grain Boundaries

Published online by Cambridge University Press:  15 February 2011

F. Boscherini ,
T. Haubold ,
S. Pascarelli ,
S. Mobilio  and
H. Gleiter
F. Boscherini
Affiliation:
INFN, Laboratori Nazionali di Frascati, P.O. Box 13, 000 44 Frascati (Roma), Italy.
T. Haubold
Affiliation:
Universität des Saarlandes, FB 15, Werkstoffwissenschaften, Gebäude 43, 6600 Saarbrücken, Germany.
S. Pascarelli
Affiliation:
INFN, Laboratori Nazionali di Frascati, P.O. Box 13, 000 44 Frascati (Roma), Italy.
S. Mobilio
Affiliation:
INFN, Laboratori Nazionali di Frascati, P.O. Box 13, 000 44 Frascati (Roma), Italy. Dipartimento di Energetica, Università dell'Aquila, Roio Monteluco, L'Aquila, Italy.
H. Gleiter
Affiliation:
Universität des Saarlandes, FB 15, Werkstoffwissenschaften, Gebäude 43, 6600 Saarbrücken, Germany.
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Abstract

We present an EXAFS study of the local environment of Co dopant atoms in nanocrystalline Cu. Due to the low solubility of Co atoms in bulk Cu, these measurements yield information on the local atomic structure of grain boundaries in nanocrystalline Cu. Previous EXAFS studies on pure nanocrystalline metals have indicated an atomic arrangement in the grain boundary component exhibiting a broad distribution of interatomic spacings which differs from the atomic structure of the crystalline or glassy state. In the present investigation a significantly reduced coordination number around Co is found; also, the first shell bond length varies with dopant concentration from that typical of Co substitutional impurities in Cu to that of bulk Co. These results suggest that Co atoms substitute Cu atoms both in the disordered grain boundaries and in the lattice of the Cucrystallites and/or form Co-precipitates.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 272: Symposium O – Chemical Processes in Inorganic Materials: Metal and Semiconductor Clusters , 1992 , 303
Copyright
Copyright © Materials Research Society 1992

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References

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