Transport Critical Current Density of (Bi_1.6Pb_0.4)Sr₂Ca₂Cu₃O₁₀ Ceramic Superconductor with Different Nanosized Co₃O₄ Addition

Figure 7

SEM micrographs of (a) non-Co₃O₄ added sample, (b) added with 10 nm Co₃O₄ (𝑥=0.03 wt.%), (c) added with 30 nm Co₃O₄ (𝑥=0.02 wt.%), and (d) added with 50 nm Co₃O₄ (𝑥=0.01 wt.%). White dots are Co₃O₄.

(a)

(b)

(c)

(d)