Abstract
The effects of Yb 2O 3 particles on the microstructure and transport properties of YBa 2Cu 3O 7-δ (YBCO) were investigated through resistance-temperature (R-T), scanning electron microscope (SEM), X-ray diffraction (XRD) and the critical current density ( J c) versus applied magnetic field ( J c-B) measurements. YBCO powder with Yb 2O 3 additives was synthesized using standard solid state reaction technique. Rietveld refinements of X-ray diffraction showed that both Yb 2O 3 and YBCO phases coexisted in the products. The critical current density ( J c) exhibited a maximum at x=0.05 in YBCO+ xYb 2O 3 systems. Moreover, small additions of Yb 2O 3 in YBCO could enhance J c by applying the magnetic field, although the superconducting temperature ( T c) decreased monotonically with increasing additive content. The characteristic behavior of J c might come from the counterbalance of two effects simultaneously, which was caused by the inhomogeneity of grains distribution in nano-scale and degradation on superconducting properties.
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