C.-G. Oertel, L. Ledig, J. Eckert, W. Skrotzki: Superconductivity of Annealed and Consolidated Amorphous YNi<SUB>2</SUB>B<SUB>2</SUB>C Powders

Crystal Research and Technology

Cryst. Res. Technol. 35 (2000) 427 - Abstract -

C.-G. Oertel, L. Ledig, J. Eckert*, W. Skrotzki

Institut für Kristallographie und Festkörperphysik, Technische Universität Dresden, Germany
*Institut für Festkörper- und Werkstofforschung Dresden, Germany

Superconductivity of Annealed and Consolidated Amorphous YNi₂B₂C Powders

Amorphous YNi₂B₂C powders have been produced by mechanical attrition. Superconductivity is absent in the amorphous state but recovers upon crystallization. However, the superconducting transition temperature T_C is lower than that of the melted analogue. T_C can be increased by increasing the annealing temperature. High temperature compaction leads to dense bulk superconducting samples. T_C of these bulk samples can be optimised by annealing. Variations in T_C are attributed to deviations from stoichiometry. Contamination of the powders with WC wear debris upon annealing may deteriorate the superconducting properties.

Keywords: borocarbides, YNi2B2C, mechanical alloying, superconductivity, consolidation

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