ChemInform Abstract: Preparation of a Barium Titanate Thin Film on a Porous Titanium Body by the Hydrothermal-Electrochemical Method.

Abstract

The electrolysis profile of the hydrothermal-electrochemical method that was used to grow BaTiO3 thin films uniformly on porous titanium bodies 5.0 mm in diameter and 1.0-2.5 mm thick, with 32.7 vol% porosity, in an aqueous solution of Ba(OH)2 at 150°C, was investigated. The thin films could be grown only in a surface region that was limited to a depth of lessthan equal to0.25 mm into the porous titanium body via a “single-step” electrolysis, in which an anodic potential was applied continuously to the porous titanium body. In contrast, the thin films could be grown uniformly on the entire surface of the porous titanium body using a “cyclic” electrolysis, in which an anodic potential and a rest potential were applied alternately. The BaTiO3 film growth inside the porous titanium body is considered to be dominated by the local solution pH.