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Superconducting properties of bulk, dense, pure MgB2 and doped (Mg1-xAx)B2samples with A = Na, Ca, Cu, Ag, Zn and Al were studied for compositionalranges 0 < x < 0.20. The effect on pinning properties and critical current wereinvestigated, particularly for A = aluminium. The samples were sintered and/orsynthesised at high pressure - high temperature in a cubic multi-anvils press(typically : 3.5-6 GPa, 900-1000C). They were characterised by x-raydiffraction, scanning electron microscopy and their superconducting propertieswere investigated by a.c. susceptibility, magnetisation (VSM and SQUID) andtransport measurements under magnetic field. Only Al substitutes really on theMg site. The other elements form secondary phases with B or Mg which do not actas pinning centres. No positive effect is observed on the superconductingproperties of the bulk MgB2 samples added with these doping elements : Tc, jccritical current, Hirr and Hc2. For Al, the effect on Hc2 remains small, andthe irreversibility line does not move, thus not improving the critical currentof the Al-doped MgB2 samples.Comment: 32 pages, 12 figures, submitted to Superond. Sci. Technol.  (Proceedings BOROMAG, Genova, Italy, June 17-19, 200

High-pressure synthesis of pure and doped superconducting MgB2compounds

High-pressure synthesis of pure and doped superconducting MgB₂compounds