Sol–gel preparation and characterization of epitaxial Y0.5Ce0.5O1.75 films on biaxially-textured NiW tapes
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High-quality Y0.5Ce0.5O1.75 films were prepared on biaxially-textured NiW tapes using sol–gel method. Y0.5Ce0.5O1.75 precursor sol was prepared using yttrium acetate and cerium 2,4-pentadionate as starting materials, propionic acid and methonal as solvents. Influence of the annealing temperature, the ion concentration and the Y/Ce mole ratio of the sol on the phase evolution, the film texture, and the film surface quality was investigated. Using the precursor sol with a low ion concentration of 0.3 mol/l, well-textured Y0.5Ce0.5O1.75 films with smooth surface were obtained on NiW tapes through an annealing process at 1,000 °C under N2 with 5 vol.% H2. The preferred c-axis orientation of the Y0.5Ce0.5O1.75 films reached a high value of 98.5 %, and the full width of half maximum of the phi scan reached an average value as low as 5.1°. The Y0.5Ce0.5O1.75 film also showed a smooth surface, with the root mean square roughness as low as 4.1 nm over 10 × 10 μm2, and 6.7 nm over 50 × 50 μm2.
KeywordsCoated conductor Film Sol–gel Buffer layer Y0.5Ce0.5O1.75
This project is supported by the National Natural Science Foundation of China (Nos. 51102195, and 51174160) and the Foundation of Science and Technology of Shaanxi Province (No. 2013KJXX-36).