Research Progress of YBCO Thin Films Prepared by Metal Organic Deposition
LI Taiguang1,2,3, HUANG Daxing1,2,3, SHANG Hongjing1,2,3, XIE Bowei1,2,3, ZOU Qi1,2,3, GU Hongwei1,2,3, DING Fazhu1,2,3
1 Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China 2 Key Laboratory of Applied Superconductivity, Chinese Academy of Sciences, Beijing 100190, China 3 University of Chinese Academy of Sciences, Beijing 100049, China
Abstract: Yttrium barium copper oxide (YBCO) coated conductor is the most promising superconducting material due to its high critical transition temperature (Tc), high critical current density (Jc), and high irreversible field (Hirr). However, the high production cost restricts the large-scale application of YBCO tapes. Instead of imparting the requisite strength and crystallinity to the superconductor by the powder-in-tube method, YBCO tapes uses epitaxial growth on the thin metal tape. Compared with other deposition technologies, metal organic deposition technology (MOD) is one of the effective preparation methods, which does not require expensive vacuum equipment, can precisely regulates the composition of thin film, and can realize mass production. Hence, it is considered to be more promising for the production of YBCO tapes. However, during the pyrolysis process, the thermal decomposition of TFA precursor films results in a drastic reduction in film thickness and is accompanied by an increase of internal stress in the films. In order to avoid cracking in the film, the original temperature-time profile developed for the calcination required nearly 10—20 h.This long process-time is not compatible with a low-cost manufacturing process. Therefore, researchers continue to improve the MOD process and have achieved fruitful results. While the superconducting properties of YBCO is ensured, the heat treatment time is greatly reduced. Ameliorated by researchers, the MOD process has been developed from the traditional trifluoroacetate-metal organic deposition method (TFA-MOD) to the low-fluorine trifluoroacetate-metal organic deposition method (LF-MOD) , and then to fluorine-free metal organic deposition method (FF-MOD). At present, by adjusting the temperature and oxygen pressure of the FF-MOD process, the deposition rate of YBCO films has reached 100 nm/s. In addition, there has been great progress on improving the magnetic flux pinning performance of YBCO films by reducing the size of the nanometer second phase in recent years. The researchers have successfully reduced the size of the nanometer second phase to 10—15 nm, through using the two-step heating process or preparing the colloidal solution of nanoparticles. And the Jc of YBCO film increased from 0.1 MA/cm2 to 0.45 MA /cm2 at 77 K and 1 T. This paper summarizes the research progress of TFA-MOD, LF-MOD and FF-MOD according to the development path of YBCO film prepared by metal organic deposition technology. On this basis, the main research progress in the preparation of strips by chemical solution methods and the improvement of the magnetic flux pinning performance of YBCO thin films in recent years are reviewed and prospected.
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2022, Vol. 36 
