Abstract
Laser floating zone (LFZ) of superconducting fibres is a controlled growth technique where axially aligned structures are developed. The process is applied to the BiSrCaCuO ceramic system where Sr 0.3Ca 0.7CuO 2 ( 1 1 ) crystallizes as primary phase with a dendritic morphology, followed by the crystallization of the superconducting phases Bi 2Sr 2CaCu 2O 8 (2212) and Bi 4Sr 4CaCu 3O 14 (4413) in the interdendritic spacing. The most favourable orientation for 1 1 dendrites shows the b-axis parallel to the pulling direction. The epitaxial orientation between the superconducting (S) phases that nucleate on the surfaces of the primary cuprate ( 1 1 ) is determined as (100) S[010] S∥(001) 1/1[010] 1/1. The superconducting phases 22 and 4413 have the b-axis aligned to the pulling direction and the a- and c-axis rotated π/2 with respect to the homologous axes of the 1 1 crystals.
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