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 in N2-0.1%O2 atmosphere at different temperatures: (a) 730 °C/6 h, (b) 750 °C/6 h, (c) 770 °C/6 h, and (d) 790 °C/6 h.