溶胶-凝胶法制备YBa2Cu3O7-δ超细粉体Preparation of YBa2Cu3O (7-δ) ultra-fine powders by sol-gel process
陈源清,赵高扬
摘要(Abstract):
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。
关键词(KeyWords): 高温超导;溶胶凝胶;超细粉体;临界转变温度
基金项目(Foundation): 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
作者(Author): 陈源清,赵高扬
参考文献(References):
- [1] HuhtinenH,LaihoR,etal.YBCOnanopowder:novelmaterialforPLDpreparationofthinfilms[J].PhysicaC,2000,341~348:2377-2378.
- [2] PaturiP,RaittilaJ,etal.PreparingsuperconductingnanopowderbasedYBCO Agtapes[J].PhysicaC,2002,372-376:779-781.
- [3] PanHY,XuXL,GuoJD.TEMcharacterizationofnanoscaleYBCOparticles[J].MaterialsLetters,2003,57:3869-3873.
- [4] Ochsenkuhn PetropoulouM,ArgyropoulouR,TarantilisP,etal.Comparisonoftheoxalateco precipitationandthesolidstatereactionmethodsforthe productionofhightemperaturesuperconductingpowdersandcoatings[J].JournalofMaterialsProcessingTechnology,2002,127:122-128.
- [5] PathakLC,MishraSK,etal.SynthesisandsinteringcharacteristicsofY Ba Cu oxidesuperconductors[J].MaterialsScienceandEngineeringB,2004,110:119-131.
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