本文研究了Na掺杂对MTG-YBCO(YBa2-xNaxCu3Oy+40mol%Y2BaCuO5,x=0.0、0.1、0.2)生长织构及其超导性能的影响.适量Na的掺入有利于MTG-YBCO沿(ab)面的生长,改善晶体生长的宏观形貌.同时,掺Na后MTG-YBCO试样的Tc,on变化不大,但Tc,off随掺杂量x的增加而降低,即超导转变宽度ΔT增大.适量Na掺杂改善了MTG-YBCO的临界电流密度特性,并在临界电流随外磁场变化的曲线中观察到第二峰现象.经900oC高温退火处理后,第二峰消失,其后的400oC吸氧处理使Jc随吸氧时间增长而增加,且第二峰现象重现.本文同时探讨了Na掺杂MTG-YBCO的这种临界电流密度行为形成的机制.
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