Journal
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
Volume 25, Issue 3, Pages 204-208Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.pnsc.2015.06.001
Keywords
(Ag)(x)/CuTl-1223 composites; Ag nanoparticles; weak-links; superconducting properties
Funding
- Higher Education Commission (HEC) of Pakistan
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Series of (Ag)(x)/(Cu0.5Tl0.5Ba2Ca2Cu3O10-delta) {(Ag)(x)/CuTl-1223) nano-superconductor composites were synthesized with different concentrations (i.e. x=0 similar to 4.0 wt%) of silver (Ag) nanoparticles. Low anisotropic CuTl-1223 superconducting matrix was prepared by solid-state reaction and Ag nanoparticles were prepared by a sol gel method separately. The required (Ag)(x)/CuTl-1223 composition was obtained by the inclusion of Ag nanoparticles in CuTl-1223 superconducting matrix. Structural, morphological, compositional and superconducting transport properties of these composites were investigated in detail by x-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive x-rays (EDX) spectroscopy and four-point probe electrical resistivity (rho) measurements. The inclusion of Ag nanoparticles enhanced the superconducting properties without affecting the tetragonal structure of the host CuTl-1223 matrix. The improvement in superconducting properties of (Ag)(x)/CuTl-1223 composites is most likely due to enhanced inter-grains coupling and increased superconducting volume fraction after the addition of metallic Ag nanoparticles at the inter-crystallite sites in the samples. The presence of Ag nanoparticles at the grain-boundaries may increase the number of flux pinning centers, which were present in the form of weak-links in the pure CuTl-1223 superconducting matrix. (C) 2015 The Authors. Published by Elsevier GmbH.
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