Transient liquid assisted nucleation mechanism of YBa

Author: Zhao-Hui Gu   Wen-Tao Yang   Chuan-Yi Bai   Yan-Qun Guo   Yu-Ming Lu   Zhi-Yong Liu   Qi Lu   Gang-Qiang Shu   Chuan-Bing Cai  

Publisher: IOP Publishing

E-ISSN: 1741-4199|24|9|96805-96810

ISSN: 1674-1056

Source: Chinese Physics B, Vol.24, Iss.9, 2015-09, pp. : 96805-96810

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Abstract

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.