Abstract
We Prepared Bi-Pb-Sr-Ca-Cu-0 films on polycrystal MgO substrate by using sol-gel method. We soaked them in water, acetone, propionic acid, or solution of pH 2.0-4.7, and we investigated by X-ray diffraction and SEM methods how crystal phases and morphology changed by soaking.
For the sol-gel method, we chose metal acetates as solutes and propionic acid as a solvent without controlling pH. Although any change was not found on film samples soaked by water or acetone, the dissolution of Bi-system was found for the samples soaked by proplonic acid. The dissolution is considered as the reason why the thickness could not increase after several coating of starting solution without controlling pH. By controlling pH by addition of aqueous ammonia, we obtained the viscosity of starting solution of 42mPa⋅s and the thickness of coat-ing film.
