Radial inhomogeneities induced by fiber diameter in electrically assisted LFZ growth of Bi-2212
authors Carrasco, MF; Silva, RA; Silva, NJO; Silva, RF; Vieira, JM; Costa, FM
nationality International
journal APPLIED SURFACE SCIENCE
author keywords Electrically assisted laser floating zone process; Fibers; Superconductors
keywords O SUPERCONDUCTING FIBERS; MICROSTRUCTURE; BI2SR2CACU2O8; RODS
abstract Superconducting polycrystalline BSCCO fibers of 2: 2: 1: 2 nominal composition were grown by the electrically assisted laser floating zone (EALFZ) technique. An electric current density of 2.1 A cm(2) was applied through the solid/liquid (S/L) interface. A net effect of the fiber diameter on the as-grown microstructure and on the final superconducting properties is observed. A higher critical current density (similar to 2520 A cm(2)) results for the thinner fibers (phi = 1.7 mm) comparing to the value (similar to 1065 A cm(2)) found for the wider ones (phi = 2.5 mm). The steep axial thermal gradient at the S/L interface in the thinner fibers is responsible for its superior texture degree, a crucial parameter for improved current transport properties. Moreover, a Cu-free Bi(x)(Sr, Ca)(y)O(z) phase crystallizes preferentially from the melt in the wider fibers, acting as obstacles to the current flux. (C) 2008 Elsevier B. V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0169-4332
year published 2009
volume 255
issue 10
beginning page 5503
ending page 5506
digital object identifier (doi) 10.1016/j.apsusc.2008.07.101
web of science category Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter
subject category Chemistry; Materials Science; Physics
unique article identifier WOS:000263865000089
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