“…Such impurities should be chosen so that they, on the one hand, would not decrease the critical temperature of the initial superconductor and, on the other hand, play the role of effective pinning centers when incorporated introduced into a superconducting material. Investigations on introduction of nanoadditives of magnesium oxide; niobium, tantalum, titanium, and silicon carbides; and hafnium nitride into HTSC materials have been performed [1]. The results obtained showed that the critical current density in HTSC compounds (Bi,Pb) 2 Sr 2 CaCu 2 O 8 + x (Bi2212) and (Bi,Pb) 2 Sr 2 Ca 2 Cu 3 O 10 + x (Bi2223) can be increased [1,2].…”