Epitaxial growth of YBa2Cu3O film on single-domain YBCO substrate for rf component development

Interface structure of YBa2Cu3Ox thin films prepared by a non-fluorine sol$ndash$gel route on a single-domain substrate

“…Although there have been limited data on the surface resistance of single-domain YBCO, our preliminary experiments have shown quite promising results in this material. As has been reported, the surface resistance of the single-domain YBCO measured at 77 K and 0.8 GHz has reached 0.05 m indicating an extremely low value comparable to those of thin films [10][11][12]. Such a low surface resistance satisfies the basic requirement in the development of the receiver component.…”

“…Such a low surface resistance satisfies the basic requirement in the development of the receiver component. In addition, our previous work has also shown respectable Q values up to 10 4 , measured from a substrate-less cavity resonator measured at 18 GHz [11].…”

“…For the precursor solution, stoichiometric (1:2:3) yttrium trimethylacetate, barium hydroxide and copper trimethylacetate powders were dissolved in a mixed propionic acid/amine solvent with an oxide concentration between 0.1 and 0.5 mol l −1 . The addition of amine was important because [ [10][11][12][13][14]. The YBCO substrates were sectioned from a large single-domain material ceramic that was 20 mm in diameter.…”

Structural characterization of epitaxial YBCO thin films prepared by a fluorine-free sol–gel method for coated conductors

“…Our fluorine-free sol-gel YBCO solutions were developed inhouse [14][15][16]. For the precursor solution, stoichiometric (1 : 2 : 3) yttrium trimethylacetate, barium hydroxide and copper trimethylacetate powders were dissolved in a mixed propionic acid/amine solvent with an oxide concentration between 0.1 and 0.5 mol l −1 .…”

“…Therefore, the transport J c was low even for well-textured epitaxial YBCO films that did not contain fluorine. In our recent studies, however, using a fluorine-free sol-gel approach involving the trimethylacetate salts and proponic acid (TMAP) precursor solution, welltextured, epitaxial YBCO thin films were synthesized [14][15][16]. The transport critical current density was found to steadily increase as the microstructure was improved in the YBCO thin film prepared by the fluorine-free sol-gel TMAP method.…”