银线表面浸涂法制备Bi_2Sr_2Ca_1Cu_2O_x超导膜  

PREPARATION OF Bi_2Sr_2Ca_1C_u_2O_x SUPERCONDUCTING FILMS ON Ag WIRES BY DIP-COATING METHOD

作　　者：宋洋[1] 赵亮[2] 李霈[2] 瞿体明[2] 韩征和[2] 黄勇[1] 

机构地区：[1]清华大学材料科学与工程系,新型陶瓷与精细工艺国家重点实验室 [2]清华大学物理系应用超导研究中心,北京100084

出　　处：《硅酸盐学报》2006年第9期1031-1035,共5页Journal of The Chinese Ceramic Society

基　　金：教育部学科建设专项基金(985)资助项目

摘　　要：通过浸涂法在银圆线表面制备了Bi2Sr2Ca1Cu2Ox(Bi–2212)超导厚膜。在热处理过程中,局部熔化温度和固相烧结温度对Bi–2212相的形成起关键作用。表面涂覆的直径为0.5mm银线在液氮温度、0T磁场下临界电流密度可达10000A/cm2。系统研究了在不同氧分压下,经不同温度退火处理后样品的临界温度Tc值,结果表明:最优退火温度为760℃,样品的Tc值为96.98K,氧分压越高,样品的Tc值越大。此外,Bi–2212材料在空气中放置具有时间效应,会对Tc产生影响。Bi2Sr2CalCU2Ox （Bi-2212） thick films on Ag wires were prepared by using the dip-coating method. It was found that the partial melting temperature and solid phase sintering temperature parameters during heat treatment strongly influence the phase formation of Bi-2212. The critical current density of dip-coated thin wire with a diameter of 0.5 mm can reach 10 000 A/cm^2 at liquid nitrogen temperature and at 0 T magnetic field. Post-annealing treatments at different temperatures and oxygen partial pressures were executed in order to study the variation of critical temperature （Tc） values. Results show that the optimal post-annealing temperature is 760℃, and the corresponding Tc value is 96.98 K. During the post-annealing process, the higher the oxygen partial pressure is, the higher the Tc value will be. Furthermore, the properties of Bi-2212 materials have time effects when exposed to air, causing their critical temperature to change.

关 键 词：浸涂 银线 局部熔化温度 固相烧结温度 后退火 临界温度 时效 

分 类 号：O511[理学—低温物理]