Magnetoresistivity studies for BiPb-2223 phase added by BaSnO3 nanoparticles

Abstract

Co-precipitation method and conventional solid-state reaction technique were used to synthesize BaSnO 3 nanoparticles and (BaSnO 3 ) x /Bi 1.6 Pb 0.4 Sr 2 Ca 2 Cu 3 O 10+δ (0 ≤ x ≤ 1.50 wt%) samples, respectively. X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and electrical resistivity data were used to characterize BiPb-2223 phase added by BaSnO 3 nanoparticles. The relative volume fraction and superconducting transition temperature T c of BiPb-2223 phase were enhanced by increasing BaSnO 3 addition up to 0.50 wt%. These parameters were decreased with further increase of x. The resistive transition broadening under different applied DC magnetic fields (0.29-4.40 kG) was analyzed through thermally activated flux creep (TAFC) model and Ambegaokar-Halperin (AH) theory. Improvements of the derived flux pinning energy U, critical current density J c (0) estimated from AH parameter C(B), and upper critical magnetic field c2 (0) B , were recorded by adding BaSnO 3 nanoparticles up to 0.50 wt%, beyond which these parameters were suppressed. The magnetic field dependence of the flux pinning energy and critical current density decreased as a power-law relation, which indicated the single junction sensitivity between the superconducting grains to the applied magnetic field. Furthermore, the increase in the applied magnetic field did not affect the electronic thermal conductivity e  above the superconducting transition temperature and suppressed it below T c .

Effect of Na-substitution on magnetoresistance and flux pinning energy of Bi-2212 ceramics prepared via hot-forging process

“…where β is a magnetic field constant orientated with respect to basal plane [52]. By using the data presented in Fig.5, we have obtained β values of 0.62, 0.63, 0.64, 0.61, and 0.57 (see Table- ΔT ≈ H n ≈ H β/q…”

“…Accordingly, these regions cause the weakening of vortex pinning strength due to the reduction of the superconducting current path [52]. On the other hand, the decrease in ΔT by increasing the Na-content might be due to the decrease in microscopic inhomogeneous superconducting phases and/or an increment of intergrain connectivity.…”

Nanosized BaSnO3 as Electron Transport Promoter Coupled with g‐C3N4 toward Enhanced Photocatalytic H2 Production

“…In addition, the distinct diffraction peaks at 30.6°, 43.9°, and 54.5°, which were correspondingly assigned to (110), (200), and (211) planes of BaSnO 3 , were observed in the BaSnO 3 /g‐C 3 N 4 composites (CN‐ x BSO, x = 0.04, 0.10, and 0.40). [ 31,32 ] Moreover, a single weak diffraction peak at 24.9° belonging to BaCO 3 appeared in the BaSnO 3 /g‐C 3 N 4 samples, indicating that the chemical reaction of generating BaCO 3 occurred during the reaction process, which could not be easily avoided. [ 33–36 ] It was worth noting that the peak intensities of both (100) and (002) planes of g‐C 3 N 4 from CN‐ x BSO samples obviously decreased when the amount of BSO in the composites increased, which were attributed to the remarkable inhibition effect for BSO on the surface of CN structure that induced diffraction reduction in principle, indicating that BSO was successfully deposited on the surface of CN.…”

Superconducting and Electrical Resistivity of HTS Bi-2223 Doped by (Cr₂O₃:SnO)_x Nanoparticles

“…Many factors are significantly influencing the phase formation kinetics of Bi-2223 HTS including the nominal composition of the precursor powder, thermal processing time and temperature, particle size of dopants, milling treatment of precursor, texturing and synthesis atmosphere [15]. Among these factors, the micro -and nanosized dopants is the most dynamic part for improving the intergrain connectivity which resulted in higher Tc than Bi-2223 [5,[16][17][18].…”