凝胶燃烧法制备超细YBa_2Cu_3O_(7-x)超导粉末(英文)  

PREPARATION OF ULTRA-FINE SUPERCONDUCTING YBa_2Cu_3O_(7-x) POWDERS BY GEL COMBUSTION PROCESS

作　　者：郭建栋[1] 徐晓林[1] 王永忠[1] 张炎[1] 刘达颐[1] 石磊[1] 

机构地区：[1]北京大学物理学院 介观物理和人工微结构国家重点实验室,北京100871

出　　处：《低温物理学报》2005年第A02期882-887,共6页Low Temperature Physical Letters

基　　金：国家自然科学基金(项目号50377040);中国科技部(NKBRSG-G19990646)资助课题~~

摘　　要：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 .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.

关 键 词：YBCO超导体 凝胶燃烧法 柠檬酸盐-硝酸盐比例 纳米粉末 

分 类 号：O511.3[一般工业技术—材料科学与工程]