【作者】 陈源清； 赵高扬； 郅晓；

【Author】 Chen Yuanqing~1, Zhao Gaoyang~1 Zhi Xiao~2 (1. School of Material Science and Engineering, Xi’an University of Technology, Xi’an ShanXi, 710048; (2. China Luoyang Float Glass Group Company of Limited Liability, Luoyang Henan, 471009)

【机构】 西安理工大学材料科学与工程学院； 洛阳浮法玻璃集团公司；

【摘要】 以钇,钡,铜的醋酸盐为起始原料,乙醇为溶剂,二乙烯三胺、丙酸为络合剂,制备了稳定的YBa₂Cu₃O_7.（?）（YBCO）溶胶。溶胶经70℃蒸发溶剂后,形成凝胶,经500℃热分解,850℃高温烧结,随后在500℃氧气条件下退火后,获得了临界转变温度为92K的YBCO超导粉体。利用差热仪分析了凝胶热分解过程,通过X射线衍射仪对粉体进行了物相分析,利用扫描电镜观察粉末的粉体形貌。实验表明,热分解速度影响最终YBCO粉体形貌:快速热分解有利于获得细小、均匀的YBCO超导粉体。更多还原

【Abstract】 With acetate as starting materials, alcohol as solvent, diethylenetriamine and propionic acid as complexing agents, stable YBa₂Cu₃O_7-δ（YBCO）sol was prepared. After the solvent evaporation by heating at 70 ℃, the black gel was obtained and subsequently pyrolyzed at 500 "C.The pyrolyzed precursor powders were sintered at 850℃and annealed at 500℃ in oxygen atmosphere, producing the YBCO superconducting powders with critical transition temperature of 92K. Differential Thermal Analysis was used to analyze the pyrolysis process; X-ray Diffraction was used to analyze the powder phase-structure; and Scanning Electronic Microscopy was used to observe the powder morphology. Results show that rapid pyrolysis and low sintering temperature are favorable for obtaining small-sized, homogenized powders.更多还原