Phase Evolution of YBa2Cu3O7-x films by all-chemical solution deposition route for coated conductors

11th European Conference on Applied Superconductivity

Zhao, Yue^1 ; Tang, Xiao^1 ; Wu, Wei^2 ; Grivel, Jean-Claude^1

Department of Energy Conversion and Storage, Technical University of Denmark, Roskilde

4000, Denmark^1

Department of Physics, Tsinghua University, Beijing

100084, China^2

关键词: Annealing temperatures;    Chemical solution deposition;    Diffusion controlled reactions;    High critical current densities;    High sintering temperatures;    Metal organic deposition;    Metalorganic solution;    Structural and superconducting properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/507/1/012056/pdf
DOI  :  10.1088/1742-6596/507/1/012056

来源: IOP

【 摘 要 】

In order to understand the all-chemical-solution-deposition (CSD) processes for manufacturing coated conductors, we investigated the phase evolution of YBa2Cu3O7(YBCO) films deposited by a low-fluorine metal-organic solution deposition (LF-MOD) method on CSD derived Ce0.9La0.1O2/Gd2Zr2O7/NiW. It is shown that the phase transition from the pyrolyzed film to fully converted YBCO film in the LF-MOD process is similar to that in typical trifluoroacetates-metal organic deposition (TFA-MOD) processes even though the amount of TFA in the solution is reduced by almost one half compared with typical TFA-MOD cases. Moreover, we found that the formation of impurities (mainly BaCeO3, NiWO4and NiO) is strongly related to the annealing temperature, i.e., the diffusion controlled reactions become intensive from 760oC, which might be connected with the poor structural and superconducting properties of the films deposited at high sintering temperatures. Based on these results, the optimized growth conditions of YBCO films were established, and a high critical current density (Jc) of about 2 MA/cm2(77 K, self field) is achieved in a 200 nm thick YBCO film in the architecture made by our all CSD route.