摘要
利用醋酸盐为起始原料,乙二醇甲醚为溶剂,以二乙烯三胺、乳酸和丙酸为络合剂,制备了稳定的YBa2Cu3O7δ(YBCO)溶胶。溶胶经干燥形成凝胶后,再通过热分解及高温煅烧,获得了YBCO粉体。利用X射线衍射对粉体进行了物相分析,利用透射电子显微镜观察了粉体形貌并分析了其晶体结构。结果表明该粉体粒径在几十到几百纳米,其晶体结构为正交钙钛矿结构。把该粉体压制而成的YBCO块体,在900℃氧气条件下烧结1h,即得到了临界转变温度(Tc)为92.5K的高温超导体。
With acetates as original material,methoxyethanol as solution,diethylenetriamine,lactic acid and propionic acid as complexing agents,stable YBa_2Cu_3O_ 7-δ(YBCO) sol was prepared.After the sol was dried and subsequently heat-treated at 880℃ in house,ultra-fine YBCO powders were fabricated.The powders were examined by X-ray diffraction(XRD) and transmission electronic microscopy(TEM).The results indicate that the powders are orthorhombic perovskite YBCO phase,and the diameter of the powder particles is in a range of tens to hundreds nanometers.The powder-pressed bulk YBCO sintered at 900℃ for 1h in flowing oxygen atmosphere,has a high critical superconducting temperature(T_c=92.5K).
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2006年第1期1-3,共3页
Transactions of Materials and Heat Treatment
基金
国家重大基础研究前期研究专项(No:2003CCA03300)
国家自然科学基金(No:904401009)项目
关键词
高温超导
溶胶-凝胶
超细粉体
临界转变温度
superconductor
sol-gel
ultra-fine powders
critical superconducting temperature
