Effect of starting precursor onI_canisotropy in powder-in-tube (Bi, Pb)2223/Ag tapes

Abstract

Two powder precursors, differentiated by their average grain size, have been applied to the manufacture of monocore and 19-filament Bi(2223)/Ag tapes by the powder-in-tube (PIT) method. The optimized PIT route has been applied for each precursor. The influence of both precursors on the I c anisotropy and critical current density J c in the final tapes have been studied. The transport current properties are related to grain morphology and texturization of both materials. Finer starting precursor has led to much higher I c anisotropy and to better bulk texturization of the ceramic cores resulting in higher J c .