Influence of Heat Treatment on Structure and Superconducting Properties of YBCO Film by Chemical Solution Deposition Method
Influence of Heat Treatment on Structure and Superconducting Properties of YBCO Film by Chemical Solution Deposition Method
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DOI：
10.1007/s10948-011-1204-7
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发表时间：
2012
影响因子：
1.8
通讯作者：
W. Wang;X. Yang;M. Pu;H. Zhang;C. H. Cheng;Y. Zhao
中科院分区：
文献类型：
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作者：
W. Wang;X. Yang;M. Pu;H. Zhang;C. H. Cheng;Y. Zhao
采用自行研制的无氟聚合物辅助金属有机沉积(PA-MOD)方法在(00l)LaAlO_3单晶衬底上制备了YBCO薄膜。研究了热处理对YBCO薄膜织构、微结构和超导性能的影响。样品在不同升温速率下进行145~500 °C的热解后，在Ar和O2混合气体中于760~780 °C下烧成，然后在纯O2中于450 °C下进行热处理。结果表明，在770 °C下以0.5cmC/ 的速度分解后，薄膜的T_c和J_c(77℃，0℃)最高，分别为90.4K和2.0A/cm~2。根据X射线衍射谱、Phi-Scan和Omega-Scan曲线以及扫描电子显微镜(SEM)图像，可以认为这种良好的性能归因于更好的双轴织构和更纯净的YBCO相以及更好的晶粒连通性。
YBCO films have been fabricated on a (00l) LaAlO3single-crystal substrate via self-developed fluorine-free polymer-assisted metal organic deposition (PA-MOD) method. The influence of heat treatment on texture, microstructure and superconducting properties of YBCO films has been investigated. After a pyrolysis process ranging from 145 °C to 500 °C with different heating rates, the samples were fired at 760–780 °C in Ar and O2mixture gas followed by annealing at 450 °C in pure O2. The results indicate the film fired at 770 °C after decomposition at the rate of 0.5 °C/min showed the highestTcof 90.4 K andJc(77 K, 0 T) over 2 MA/cm2. According to the XRD patterns, phi-scan and omega-scan curves as well as SEM images, the good properties may be attributed to better biaxial texture and purer YBCO phase as well as better grain connectivity.