Effect of Sol-Gel Synthesized BiFeO_3 Nanoparticle Addition in YBa_2Cu_3O_(7-δ) (Y123) Superconductor Synthesized by Standard Solid State Reaction Method

摘要

The effects of multiferroic BiFO_3 (BFO) nanoparticles addition on the structure and superconducting properties of YBa_2Cu_3O_(7-δ) (Y123) superconductors were investigated. (YBa_2Cu_3O_(7-δ))_(1-x)(BFO)_x (x=0.0025, 0.005, 0.01, 0.05, and 0.1 weight percent (wt. %)) samples with were characterized using X-ray diffraction (XRD), field emission scanning electron micrograph (FESEM), EDX and four-point probe measurement. At low amount BFO (x=0.25 - 5 wt. %) the samples preserved the orthorhombic structure similar to the pure Y-123. The samples became more porous and their grain size slightly decreased with addition of BiFeO_3. The addition of BFO disturbed the grain growth of Y123, thus resulting in the degradation of superconducting properties of the samples. The superconducting transition temperature (T_(c onset)) of samples decreased from 92 K for x=0.0 to 44 K for x=10.0 wt. %, which could be attributable to oxygen vacancy disorder.