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

作　　者：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 

机构地区：[1]Shanghai Key Laboratory of High Temperature Superconductors

出　　处：《Chinese Physics B》2015年第9期413-418,共6页中国物理B（英文版）

基　　金：Project supported by the Science and Technology Commission of Shanghai Municipality,China(Grant Nos.13111102300 and 11dz1100302);the National Natural Science Foundation of China(Grant Nos.11174193 and 51202141);the National Basic Research Program of China(Grant Nos.2011CBA00105);the Science and Technology Commission of Shanghai Municipality,China(Grant No.14DZ2260700)

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.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.

关 键 词：YBa_2Cu_3O_（7-δ） coated conductor NUCLEATION 

分 类 号：TB306[一般工业技术—材料科学与工程] TB383.2