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Phase Formation, Stability and Superconducting Properties of Mechanically Alloyed Yttrium-Nickel-Borocarbides

Published online by Cambridge University Press:  16 February 2011

L. Ledig ,
D. Hough ,
C.-G. Oertel ,
J. Eckert  and
W. Skrotzki
L. Ledig
Affiliation:
Institut für Kristallographie und Festkörperphysik, TU Dresden, D-01062 Dresden, Germany
D. Hough
Affiliation:
Institut für Kristallographie und Festkörperphysik, TU Dresden, D-01062 Dresden, Germany
C.-G. Oertel
Affiliation:
Institut für Kristallographie und Festkörperphysik, TU Dresden, D-01062 Dresden, Germany
J. Eckert
Affiliation:
Institut für Festkörper- und Werkstofforschung, D-01 171 Dresden, Germany
W. Skrotzki
Affiliation:
Institut für Kristallographie und Festkörperphysik, TU Dresden, D-01062 Dresden, Germany
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Abstract

The solid state reaction of YNi2B2C by mechanical alloying of elemental powders has been investigated by X-ray diffraction, transmission electron microscopy and susceptibility measurements. Depending on the ball milling parameters either nanocrystalline YNi2B2C or an amorphous phase can be produced. Crystallization of the amorphous phase by annealing at 893 K produces YNi2B2C as major and Ni2B as minor intermetallic compound. Superconductivity is only observed in the annealed state. However, the transition temperature is much lower than in arc-melted samples. This is discussed with respect to the nanocrystalline and amorphous state as well as deviations from stoichiometry produced by impurities introduced during milling.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 547: Symposium DD – Solid-State Chemistry of Inorganic Materials II , 1998 , 463
Copyright
Copyright © Materials Research Society 1999

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