Preparation of YBa_2Cu_3O_<7-x>(YBCO) Superconductive Film Using Sol-Gel Method

概要

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Using alkoxides of Y and Ba and Cu-acetate as raw materials, Y Ba_2Cu_3O_<7-x>(YBCO) superconductive films were produced through the sol-get method. When the nonaqueous mixed solution was hydrolyzed under an appropriate condition, a pure and homogeneous YBCO powder could be prepared. Controlling the metal concentration and the temperature of the sol, precursor (gel) films were formed on YSZ substrate by dip-coating. And heating the films in the range of 200°-950℃, changes of the films morphologies, the generated phases and the film reactions with the substrates were studied using scanning electron microscopy and X-ray diffraction. It has been known that to improve the superconductivity of the film it is necessary to sinter it at as high as 950℃ and increase its thickness over about 3 μm after sintering. A superconductive film with T_<c.off>=75 K was obtained by adopting these conditions.
社団法人応用物理学会の論文
1991-07-15