Abstract
The microstructural and electrical properties of Bi2223/Ag tapes during the heat treatment process was investigated using XRD, SEM and electrical measurements. It was found that the conversion process of Bi22212 to Bi2223 phase was a diffusion-controlled, two-dimensional reaction, which features a rapid Bi2223 phase increase at early sintering stages and then a slow increase with prolonged sintering. Mass density, grain alignment and grain growth improved during the entire heat treatment process, with significant improvement during early stages. Zero resistivity of tapes at temperature above 77 K was not observed immediately after the Bi2223 phase appeared, but after continuous Bi2223 phase paths formed. The correlation between phase composition, microstructure and transport properties was also studied.
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