Abstract
By using solid state ceramic synthesis technique, we have produced high- T c superconducting ceramics with a fixed nominal composition of Bi 1.7 Pb 0.3 Sr 2 Ca 2 Cu 3 O y (BSCCO). Annealing treatments in air at 800 °C for different time periods from 6 to 30 h were carried out for the BSCCO samples. The influence of annealing time on the superconducting and mechanical properties were examined by measurements of thermoelectric power (TEP), X-ray diffraction, surface morphology, bulk density and Vickers microhardness ( V H N ). The results reveal that the most appropriate annealing time to obtain the highest peak intensity of high- T c phase (2223), highest and sharpest transition temperature (), maximum value of density and maximum of V H N is 18 h. Prolongation of the annealing time was associated with a reduction of all these parameters. These observations show that the annealing treatment plays an important role for producing consolidate superconducting compounds with improved mechanical properties.
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