Abstract
The effect of the sintering temperature, the cooling rate and the additive on the critical parameters was studied on samples with nominal composition Bi 1.8( Pb 0.26) Sr 2 Ca 2 Cu 3 O 8+x both undoped and with addition of 5, 9, 12.7 mol % of boron (as B 2 O 3), respectively. The sample with 5 mol % of boron cooled slowly had the critical current density five times higher than undoped sample. The rapid cooling of the samples caused enhancement of the volume of the 2223 phase.
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