The high-pressure synthesis of MgB2
T. A. Prikhna, W. Gawalek, A. B. Surzhenko, N. V. Sergienko, V. E. Moshchil, T. Habisreuther, V. S. Melnikov, S. N. Dub, P. A. Nagorny, M. Wendt, Ya. M. Savchuk, D. Litzkendorf, J. Dellith, S. Kracunovska, Ch. Schmidt
Abstract
The high-pressure synthesis is one of the most promising methods to produce MgB2 superconductive (SC) material. The available high-pressure apparatuses have working volume up to 100 cm3 which allows samples up to 60 mm in diameter to be manufactured. By a short-term (1h) high-pressure (2GPa) synthesis from Mg and B we have obtained samples 2.4-2.5 g/cm3 in density, 12.1-15.6 GPa in microhardness (under 4.96 N load), 170-200 kA/cm2 at 10 K and 58-62 kA/cm2 at 20 K in critical current density at a magnetic field of 1T. Samples demonstrated 8.5 T irreversible field at 10 K and 5.5 T at 20 K. The Ta positive influence on SC properties of MgB2 has been observed.
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