【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。更多还原

【Abstract】 Bi2Sr2Ca1Cu2Ox (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 for- mation of Bi–2212. The critical current density of dip-coated thin wire with a diameter of 0.5 mm can reach 10 000 A/cm2 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.更多还原