Abstract
The effects of powder calcination on the properties of Bi-2223 tape have been investigated. The transport property of the tape was found to depend strongly on the condition for powder calcination. The tape fabricated with powder calcined at lower temperature resulted in a microstructure with a larger grain size and higher transport critical current. The development of the microstructure of the tape in the subsequent heat-treatment process is correlated with the constituents in the starting powder. The magnetization of samples characterized by SQUID indicates that the magnetic property is also correlated to the microstructures of the tape. An anomalous flux disturbance occurring at 70 K was observed on the zero-field cooling curves of all samples. c 1995.