标题：Transport Critical Current Density of (Bi<sub>1.6</sub>Pb<sub>0.4</sub>)Sr<sub>2</sub>Ca<sub>2</sub>Cu<sub>3</sub>O<sub>10</sub> Ceramic Superconductor with Different Nanosized Co<sub>3</sub>O<sub>4</sub> Addition
摘要：The effect of different nanosized Co3O4 (10, 30, and 50 nm) addition on the
Bi1.6Pb0.4Sr2Ca2Cu3O10(Co3O4)x superconductor
with  wt.% has been investigated using X-ray diffraction
method, scanning electron microscopy, transition temperature, and critical current density measurements. The samples were prepared by the conventional solid-state reaction method. Samples with  wt.% Co3O4 (10 nm) showed the highest at 102 K. The highest was observed in the  wt.% Co3O4 (10 nm) and  wt.% Co3O4 (30 nm) samples. At 77 K, of the 10 nm and 30 nm Co3O4 added samples was 6 and 13 times larger than the nonadded samples, respectively. Small addition of Co3O4 nanoparticles in the Bi1.6Pb0.4Sr2Ca2Cu3O10 (Bi-2223) samples enhanced the critical current density and the phase formation. The larger Co3O4 nanoparticle (50 nm) had a greater degradation affect on superconductivity of the Bi-2223 phase.
