Abstract
We present an investigation of Bi 1.7 Pb 0.3 Sr 2 Ca 2 Cu 3 O y system, treated in air, argon, and oxygen gaseous environment, by combination of XRD, SEM, electrical resistivity, and ac susceptibility measurements. XRD data of all the samples showed a presence of both 2212 and 2223 phases in the sample. As prepared sample showed a single transition temperature at 109 K in both ac susceptibility and electrical resistivity measurements. Samples treated in oxygen showed a single transition at 107 K in ac susceptibility measurements and at 104 K in resistivity measurements, whereas samples treated in argon had two transitions at 107 K and 85 K in ac susceptibility data and a single transition at 102 K in resistivity measurements. These results were explained in terms of coupling between grains. Intragrain critical current density of As grown sample was estimated.
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