采用热籽晶技术和"二步冷却"生长工艺,在空气中制备出了(SmGd)-Ba-Cu-O体系的单畴熔融织构样品,研究了BaCuO2-δ含量以及Sm/Gd比对超导性能和磁通钉扎机制的影响.研究表明,制备出的(SmGd)-Ba-Cu-O体系熔融织构样品没有宏观裂纹,77 K下的冻结场呈中心对称的圆锥形;当BaCuO2-δ的加入量x=0.2时,样品的Tc和Jc都比较高,其超导性能达到最佳值,过高或过低BaCuO2-δ的含量都对超导性能不利;BaCuO2-δ的加入抑制了LRE-Ba的整体替代,使得超导基体中的组分波动具有更强的△Tc钉扎;临界电流密度Jc和超导转变温度Tc都随着Sm/Gd比降低而增大,样品的临界电流密度都有非常明显的"鱼尾效应".
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