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Preparation of a Barium Titanate Thin Film on a Porous Titanium Body by the Hydrothermal‐Electrochemical Method
Author(s) -
Kajiyoshi Koji,
Sakabe Yukio
Publication year - 1999
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1999.tb02192.x
Subject(s) - titanium , materials science , electrolysis , porosity , barium titanate , hydrothermal circulation , electrochemistry , thin film , chemical engineering , anode , aqueous solution , titanate , electrolysis of water , composite material , nanotechnology , metallurgy , electrode , chemistry , ceramic , electrolyte , engineering
The electrolysis profile of the hydrothermal‐electrochemical method that was used to grow BaTiO 3 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 BaTiO 3 film growth inside the porous titanium body is considered to be dominated by the local solution pH.