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TT: Tiefe Temperaturen

TT 23: Posters Superconductivity, Solids at Low Temperature

TT 23.6: Poster

Monday, March 7, 2005, 14:00–18:00, Poster TU D

Influence of the stoichiometry variations on the properties of MgB₂ prepared by mechanical alloying — •Marko Herrmann, Olaf Perner, Wolfgang Häßler, Christian Rodig, and Bernhard Holzapfel — Institut für Festkörper- und Werkstoffforschung (IFW) Dresden

MgB₂ powder was prepared by mechanical alloying of Mg and amorphous boron powder which gives a partially reacted nanosized precursor powder with a high reactivity. For studying the influence of the stoichiometry the Mg/B-ratio was variied in the range of 0.8 to 1.2. Furthermore different boron qualities were used. These precursor powders were hot pressed to bulk samples and were used for the preparation of tapes with an iron sheath. The structural and superconducting properties of bulk samples and tapes are described in detail. The samples with a Mg/B-ratio>1 show the highest critical temperature (36K) and the best current density (40 kA/cm² at 4.2K and 7.5T).