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
       

SEM micrographs of precursor powders heat-treated at 770 °C in N2-0.1%O2 atmosphere for different times: (a) 4 h, (b) 8 h, (c) 12 h, (d) 16 h, (e) 20 h, (f) 24 h.