Heat treatment on phase evolution of Bi-2223 precursor powder prepared by spray pyrolysis method
Cui Li-Jun1, 2, Zhang Ping-Xiang1, 2, 3, †, Li Jin-Shan1, Yan Guo2, Feng Yong2, Liu Xiang-Hong2, Li Jian-Feng2, Pan Xi-Feng2, Yang Fan2, Zhang Sheng-Nan3, Ma Xiao-Bo3, Liu Guo-Qing3
       

The I–V curve of 37-filament tape with precursor powder heat-treated at 770 °C for 12 h in N2-0.1%O2 atmosphere; with inset showing x-ray diffraction pattern of 37-filament Bi-2223 tape.