Effect of nanosized Co0.5Ni0.5Fe2O4 on the transport critical current density of Bi1.6Pb0.4Sr2Ca2Cu3O10 superconductor

Abstract

Abstract. The effects of nano-sized Co 0.5 Ni 0.5 Fe 2 O 4 addition on the superconducting and transport properties of Bi 1.6 Pb 0.4 Sr 2 Ca 2 Cu 3 O 10 (Bi-2223) in bulk form has been investigated. Bi-2223 superconductor was fabricated using coprecipitation method and 0.01 -0.05 wt% of Co 0.5 Ni 0.5 Fe 2 O 4 nanoparticles with average size of 20 nm were added into the samples. The critical temperature (T c ) and critical current density (J c ) of the samples were measured by using the four-point probe method, while the phase formation and microstructure of the samples were examined using x-ray diffraction and SEM respectively. It was found that J c of all samples added with Co 0.5 Ni 0.5 Fe 2 O 4 were higher than nonadded sample, with x = 0.01 wt. % sample showing the highest J c . This study showed that small addition of nanoCo 0.5 Ni 0.5 Fe 2 O 4 can effectively enhance the transport critical current density in Bi-2223 superconductor.

Role of anti-ferromagnetic Cr nanoparticles in CuTl-1223 superconducting matrix

“…But the inclusion of nanostructures of different elements and compounds of different sizes in bulk superconducting matrix is an efficient, cheap and easy technique [10]. The increase of critical current density (J c ) was attributed to improved inter-grains connectivity of the host bulk Bi-2223 superconducting matrix after the addition of Co 0.5 Ni 0.5 Fe 2 O 4 and Co 3 O 4 nanoparticles [11,12]. Improvement in superconducting properties of (Bi, Pb)-2223 system was observed after the addition of appropriate amount (x≤0.5 wt.%) of Cr 2 O 3 nanoparticles [13].…”