Fabrication and magnetic properties of SiO2 nanoparticles-doped BSCCO superconducting nanofibers by solution blow spinning

In this work, the magnetic properties of Bi 2 Sr 2 CaCu 2 O 8+θ (BSCCO) superconducting nanofibers prepared by solution blow spinning technology were studied systematically. The BSCCO superconductors were doped with SiO 2 nanoparticles in order to study the influence of non-superconducting impurities on the microstructure and magnetic properties of superconductors. The results showed that 0.2 wt% SiO 2 nanoparticles can improve superconducting performance as efficient magnetic flux pinning centers in BSCCO superconductors. For examples the superconducting transition temperature was increased from 76.5 K to 80.3 K, the critical current density was increased from 0.68 × 10 8 A m −2 to 1.43 × 10 8 A m −2 , and the pinning strength was increased from 4.4 × 10 7  N m −3 to 8.1 × 10 7  N m −3 . In addition, it was found that appropriate amount of SiO 2 nanoparticles can improve the size of superconducting grains and enhance the connectivity of superconducting grains. Moreover, the pinning mechanism of each sample demonstrated that SiO 2 nanoparticles improved the pinning performance of BSCCO. Furthermore, this is the first report on the BSCCO superconductors that doped with SiO 2 nanoparticles.