金属アルコキシドを出発原料に用いるゾルーゲン法によるYBa2Cu3O7-x膜の作製とその評価

概要

論文の詳細を見る
YBa2Cu3O7-x superconducting Films were prepared on YSZ ceramic substrates through sol-gel method using metal alkoxides of Y, Ba and Cu as starting materials. Cu-alkoxide could be dissolved in C2H4N2(C2H4OH)4 to get a homogeneous solution contained of all metal elements. Using the sols obtaind by warming the solution at 80°C, the gel films were fabricated as precoucer by dipping technique. If gel films were over 2μm of thickness by one dipping, the films happened to crack in the proccess of drying at 200°C or calcination at 500°C. Gel films could be changed to the films of 123 phase by sintering at 850°C for 30min, and the films reacted with YSZ substrates over 900°C to produced BaZrO3 and 123 phase in the films decomposed to 211 phase and CuO, more drastically to 202 phase at 950°C. To obstruct reactions with the substrate, the films thickness was increased to 5-10μrn by repeating the dipping process. The film of l0μ m had showed Tc⋅o (R=0 Ω) at 54K higher than the film of 5μm, but to more improve CIP treatment was added to the film to get the metallic resistivity and Tc⋅o at 85K.
社団法人粉体粉末冶金協会の論文