Abstract
The microstructure, phase composition, texture, and superconducting properties (Tc, ΔTc, jc(T), and R(T) at H= 0 and 5 mT) of (Bi,Pb)2Sr2Ca2Cu3O10 + δ ceramics (sintering at 840°C for 36 h) with ultrafine Si3N4 additions (0.05–0.2 wt %) are studied. The introduction of 0.05–0.1 wt % Si3N4 is shown to reduce the width of the superconducting transition by 2–3 K and to raise the critical current density at temperatures below 95 K.
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