PROCESS FOR PRODUCING AN ELONGATE SUPERCONDUCTOR WITH A BISMUTH PHASE HAVING A HIGH TRANSITION TEMPERATURE AND SUPERCONDUCTOR PRODUCED ACCORDING TO THIS PROCESS

摘要

The process enables an elongate superconductor having at least one conductor core which is embedded in an Ag matrix and is made of superconductive material with a 2212 or 2223-type bismuth phase with a high transition temperature (Tc) to be produced. To this end, the cross-section of a structure consisting of the Ag matrix material and an initial product of the superconductive material is reduced. The resultant raw conductor is then annealed in an oxygenous atmosphere. According to the invention, annealing is performed by varying the temperature such that it fluctuates periodically between a higher temperature (T1) and a lower temperature (T2). The higher temperature (T1) is at most 7K above the decomposition temperature (Tz) of the phase to be formed and the lower temperature (T2) is at most 9K below this temperature.