Optimization of fluorine content in TFA-MOD precursor solutions for YBCO film growth
Optimization of fluorine content in TFA-MOD precursor solutions for YBCO film growth
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DOI：
10.1088/0953-2048/29/1/015001
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发表时间：
2016-01-01
影响因子：
3.6
通讯作者：
Zhang, P. X.
中科院分区：
文献类型：
--
作者：
Jin, L. H.;Li, C. S.;Zhang, P. X.
采用化学法制备了几种不同氟含量的低氟溶液。相对于常规的全三氟乙酸盐溶液，这些溶液中的氟含量计算为0%、7.7%、15.4%、23.1%、30.8%、38.5%和53.8%。用这些低氟溶液在LaAlO 3和CeO 2/MgO/Al 2 O3/Hastelloy基片上沉积了YBa 2Cu 3 O 7-x（YBCO）薄膜。用X射线衍射仪和扫描电子显微镜对YBCO薄膜的相形成、织构和显微结构进行了表征。并对低氟溶液的分解机理进行了探讨。结果表明，通过调节前驱体溶液中氟的含量，可以控制F/Ba比值和分解粉末中碳的含量。氟对YBCO薄膜晶化过程中的相变、形核和生长有重要影响。最佳的氟含量范围为15.4%~ 23.1%，这有利于YBCO薄膜的织构好，结构均匀，J（c）值高。
Several low fluorine solutions containing different contents of fluorine were prepared by a chemical process. The fluorine contents in these solutions with respect to the conventional all-trifluoroacetate solution were calculated as 0%, 7.7%, 15.4%, 23.1%, 30.8%, 38.5% and 53.8%. YBa2Cu3O7-x (YBCO) films were deposited on LaAlO3 and CeO2/MgO/Al2O3/Hastelloy substrates using these low fluorine solutions. The phase formation, texture and microstructure of the YBCO films were characterized by x-ray diffraction and scanning electron microscopy. The decomposition mechanism of the low fluorine solution was also discussed. The results indicate that the ratio of F/Ba and the carbon content in decomposed powders could be controlled by adjusting the fluorine content in the precursor solutions. Fluorine had a great influence on the phase transformation, nucleation and growth of YBCO film during the crystallization process. The optimization of fluorine content was in the range of 15.4%-23.1%, which contributed to the good texture, homogeneous microstructure and high J(c) value of the YBCO crystallized films.