Sol–gel preparation and characterization of epitaxial Y0.5Ce0.5O1.75 films on biaxially-textured NiW tapes
2015
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.
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