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Superconductivity of Annealed and Consolidated Amorphous YNi 2 B 2 C Powders
Author(s) -
Oertel C.G.,
Ledig L.,
Eckert J.,
Skrotzki W.
Publication year - 2000
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/1521-4079(200004)35:4<427::aid-crat427>3.0.co;2-5
Subject(s) - superconductivity , amorphous solid , annealing (glass) , materials science , crystallization , compaction , stoichiometry , amorphous metal , metallurgy , transition temperature , condensed matter physics , crystallography , composite material , chemical engineering , chemistry , physics , engineering
Amorphous YNi 2 B 2 C powders have been produced by mechanical attrition. Superconductivity is absent in the amorphous state but recovers upon crystallization. However, the superconducting transition temperature TC is lower than that of the melted analogue. TC can be increased by increasing the annealing temperature. High temperature compaction leads to dense bulk superconducting samples. TC of these bulk samples can be optimised by annealing. Variations in TC are attributed to deviations from stoichiometry. Contamination of the powders with WC wear debris upon annealing may deteriorate the superconducting properties.