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Burdusel, M.; Aldica, G.; Popa, S.; Enculescu, M.; Pasuk, I.; Badica, P.
Journal of superconductivity and novel magnetism, 05/2013, Letnik: 26, Številka: 5Journal Article
Bi 2 O 3 and Bi-metal powders were mixed with MgB 2 powder. Starting compositions were (MgB 2 )(Bi 2 O 3 ) x , x =0.0025, 0.005, 0.015, and (MgB 2 )(Bi) y , y =0.01. Mixtures were processed by Spark Plasma Sintering (SPS) technique. As obtained composite samples show high density, above 94 % of the theoretical density. Samples with Bi 2 O 3 for x =0.0025 and 0.005 show higher critical current densities, J c , at high fields and at 20 K than for the pristine sample. Their irreversibility field, H irr , is also higher. On the other hand, sample added with Bi-metal has lower J c and H irr at any temperature than for the pristine sample.
