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Transient liquid assisted nucleation mechanism of YBa_2Cu_3O_(7-δ) in coated conductor films derived by BaF_2 process

谷朝辉  杨文涛  白传易  郭艳群  鲁玉明  刘志勇  路齐  舒刚强  蔡传兵  
【摘要】:It is significant for low-cost preparation of YBa2Cu3O7-δ(YBCO) coated conductors to make clear the mechanism of orientation, copper segregation, and nucleation density in BaF2-derived YBCO crystallization. In the present work,a distinct nucleation mechanism was proposed based on a transient liquid phase induced by the size effect as well as near-equilibrium assumption. With this scheme the nucleation of YBCO prepared by metal–organic deposition(MOD) or the physical vapor deposition BaF2 process was semi-quantitatively analyzed, revealing that the direct driving force for nucleation is YBCO supersaturation in the liquid phase. The theoretical analysis on the nucleation orientation portion is evidenced by the experimental result.

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