Mechanism of texture formation during heat‐treatment process in Ag‐sheathed Bi‐2223 tapes

The texture formation and development of Bi‐based superconducting phases during the heat‐treatment process are carefully investigated. With increasing anneal time, the (001) texture of both 2212 and 2223 phases is enhanced. The reduction of the interfacial energy due to a Bi2O2 layer in the cell is the main factor contributing to the texture formation. The texture of the parent phase and the interface parallel to the (001) plane are beneficial factors. The effects of sheathed Ag, second phases, and voids on the texture formation are studied.