Preparation and electrical properties of barium titanate film by hydrothermal method

High concentration of the reactant is helpful to the uniformity, of the gra in, high reaction temperature is useful to the formation of the grain and l onger reaction tints affects the grain size clear ly. The higher concentrat ion of the reactant barium ion and the higher the pH value (0.25 N-pH 11.6- ->4 N-pH 13.8) and added hydroxide ion to increase the alkalinity make the uniformity of the grain very clearly. The bigger and more uniform of grain makes its dielectric constant larger. But the non-uniform gr ain having big ger size cannot increase its dielectric constant. (C) 1999 Elsevier Science Limited. All rights reserved.