E. Yanmaz et al., CHARACTERIZATION OF BI-PB-SR-CA-CU-O RODS SUBJECT TO DIRECT-CURRENT ZONING (DCZ) AND DIRECT-CURRENT ANNEALING (DCA), Journal of alloys and compounds, 195(1-2), 1993, pp. 39-42
Bulk samples with a nominal Composition of Bi1.6Pb0.4Sr2Ca3Cu4O12 were
prepared as rods by a melt casting process. A dc field was applied to
these rods and this produced a well-defined hot zone which travelled
along the rod from positive to negative and disappeared at the negativ
e end (DCZ). A further zone could be initiated at the positive electro
de by a small increase in the applied field. Direct current zoned rods
were then uniformly heated by applying a field just below that requir
ed to produce a zone (DCA) and resulted in the production of an 80K su
perconducting phase. The rods were characterised by means of microstru
ctural and physical property studies.