低温物理学报
低溫物理學報
저온물이학보
CHINESE JOURNAL OF LOW TEMPERATURE PHYSICS
2005年
z1期
882-887
,共6页
郭建栋%徐晓林%王永忠%张炎%刘达颐%石磊
郭建棟%徐曉林%王永忠%張炎%劉達頤%石磊
곽건동%서효림%왕영충%장염%류체이%석뢰
YBCO超导体%凝胶燃烧法%柠檬酸盐-硝酸盐比例%纳米粉末
YBCO超導體%凝膠燃燒法%檸檬痠鹽-硝痠鹽比例%納米粉末
YBCO초도체%응효연소법%저몽산염-초산염비례%납미분말
YBCO superconductor,gel combustion process,citrate-nitrate ratio%nano-scale powders
纳米级细度的YBa2Cu3O7-x超导粉末有可能在第二代超导带材的研制中得到应用.超细YBa2Cu3O7-x超导粉末已经通过凝胶燃烧法制备成功.使用的起始物质是钇、钡、铜的硝酸盐以及作为燃烧剂的柠檬酸.产物颗粒的尺寸大小及其超导性能依赖于自燃过程的情况,而自燃过程又与凝胶中柠檬酸盐-硝酸盐的YBa2Cu3O7-x超导粉末.在本实验中我们发现最好的燃烧剂-氧化剂摩尔比为0.5.
納米級細度的YBa2Cu3O7-x超導粉末有可能在第二代超導帶材的研製中得到應用.超細YBa2Cu3O7-x超導粉末已經通過凝膠燃燒法製備成功.使用的起始物質是釔、鋇、銅的硝痠鹽以及作為燃燒劑的檸檬痠.產物顆粒的呎吋大小及其超導性能依賴于自燃過程的情況,而自燃過程又與凝膠中檸檬痠鹽-硝痠鹽的YBa2Cu3O7-x超導粉末.在本實驗中我們髮現最好的燃燒劑-氧化劑摩爾比為0.5.
납미급세도적YBa2Cu3O7-x초도분말유가능재제이대초도대재적연제중득도응용.초세YBa2Cu3O7-x초도분말이경통과응효연소법제비성공.사용적기시물질시을、패、동적초산염이급작위연소제적저몽산.산물과립적척촌대소급기초도성능의뢰우자연과정적정황,이자연과정우여응효중저몽산염-초산염적YBa2Cu3O7-x초도분말.재본실험중아문발현최호적연소제-양화제마이비위0.5.
The ultra-fine superconducting YBa2Cu3O7-x powders were prepared by means of the gel combustion process using nitrates of Y, Ba and Cu as the starting materials and citric acid as the fuel. The resulting particle size and its superconducting properties is dependent on the nature of the auto-ignition reaction, which in turn depends upon the citrate-nitrate ratio in the gel. An attempt to determine the optimal citrate-nitrate ratio has been made in order to obtain pure, homogeneous and reasonably fine YBCO superconductor. In our experiments we found the best fuel-oxidant molar ratio to be 0.5.