Effect of V substitution on vortex pinning and superconducting properties of Bi-2212 superconductor
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Abstract
In this work, the effect of Vanadium (V) substitution in the Bi2Sr2Ca1−xVxCu2O8+y superconductor with x = 0.0, 0.05, 0.1, 0.2, 0.3, and 0.4 has been investigated. The samples were prepared by a conventional solid state reaction technique. The effects of vanadium substitution have been investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy, and magnetic characterizations. XRD patterns indicate that the Bi-(2212) phase is the major one for pure sample, but with increasing of V content, the volume fraction of Bi-2212 is reduced and transformed to mainly low-Tc phase, namely Bi-2201. 0.05 V substitution causes a remarkable increase of superconducting critical temperature as 86.2 K, which is higher than pure sample by 2.3 K. Moreover, 0.05 V leads to improvement of intragranular J C value which is calculated as 2.53 × 104 A/cm2 at 10 K. For comparison, the enhancement in J C value is about 78 % more than those value obtained for pure sample. The whisker structure with a length of 0.25 mm in main matrix is also observed in the SEM micrographs of 0.4 V substitution.
Keywords
Critical Current Density Versus Content Conventional Solid State Reaction Versus Sample Versus SubstitutionNotes
Acknowledgments
This work is supported by Research Fund of Hakkari University, Hakkari, Turkey, under Grant Contracts No. MF2014BAP1.
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