Effect of Nanosized NiF₂ Addition on the Transport Critical Current Density of Ag-Sheathed (Bi_1.6Pb_0.4)Sr₂Ca₂Cu₃O₁₀ Superconductor Tapes

Table 1

Volume fraction and critical current density (at 30 K and 77 K) of and 0.04 wt.% of 10 nm NiF₂ added Bi-2223 tapes sintered for 50 and 100 h.

(wt.%)	Sintering time (h)	Volume fraction		(A/cm^2) at 30 K	(A/cm^2) at 77 K
		Bi-2223	Bi-2212
0.00	50	73	27	6370	1040
0.00	100	76	24	8280	1290
0.04	50	84	16	14390	3090
0.04	100	85	15	17270	3730