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.
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