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采用金属有机沉积(MOD)的方法在两种缓冲层衬底上成功制备出YBCO超导层,在77K自场条件下获得超导临界电流密度达到~1MA/cm2.本文主要研究了MOD过程对缓冲层的组织结构的影响,采用X射线衍射和扫描电镜对薄膜的相组成和形貌进行了表征.结果发现,在MOD制备YBCO薄膜过程中,缓冲层会发生一定程度的界面反应和衬底氧化,对材料的超导性能产生影响.

Yt3CO films have been deposited on two kinds of buffered-substrates by metal organic deposition (MOD). The critical current densities of these YBCO films were about 1 MA/cm2 at 77 K and self field. The effect of MOD process on the buffers microstructure was discussed. The phase compositions and microstructures of these films were characterized by X-ray diffraction and scanning electron microscopy. The interfacial reaction and the substrate oxidation were observed due to the MOD process, which could lead to the decrease of the current capacity.

参考文献

[1] Holesinger TG;Civale L;Maiorov B;Feldmann DM;Coulter JY;Miller J;Maroni VA;Chen ZJ;Larbalestier DC;Feenstra R .Progress in nanoengineered microstructures for tunable high-current, high-temperature superconducting wires[J].Advanced Materials,2008(3):391-407.
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