Radial inhomogeneities induced by fiber diameter in electrically assisted LFZ growth of Bi-2212


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.



subject category

Chemistry; Materials Science; Physics


Carrasco, MF; Silva, RA; Silva, NJO; Silva, RF; Vieira, JM; Costa, FM

our authors


The financial funding from the FCT Project PTDC/CTM/66195/ 2006 and Brazilian Agency CAPES are gratefully acknowledged by the authors.

Share this project:

Related Publications

We use cookies for marketing activities and to offer you a better experience. By clicking “Accept Cookies” you agree with our cookie policy. Read about how we use cookies by clicking "Privacy and Cookie Policy".