Regensburg 2000 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 11: Borkarbide

TT 11.8: Vortrag

Dienstag, 28. März 2000, 16:30–16:45, H19

Superconductivity of annealed and consoldated amorphous YNi₂B₂C powders — •Carl-Georg Oertel¹, Lars Ledig¹, J"urgen Eckert², and Werner Skrotzki¹ — ¹Institut f"ur Kristallographie und Festk"orperphysik, Technische Universit"at Dresden, D-01062 Dresden — ²Institut f"ur metallische Werkstoffe, IFW Dresden, D- 01171 Dresden

Amorphous YNi₂B₂C powders have been produced by mechanical attrition. Superconductivity is absent in amourphous state but recovers upon crystallisation. However, the superconducting transition temperature T_C is lower than that of the molten analogue. It can be increased by increasing the annealing temperature. High temperature forging lightly dense compact superconducting samples. T_C of these bulk samples can be optimised by annealing. Variations in T_C are attributed to deviations from stoichiometry.