Preparation of barium titanate films at 55 degrees C by an electrochemical method

Electrically insulating crystalline films of BaTiO sub 3 are electrochemically deposited on Ti substrates at > or = 55 degrees C. A TiO sub 2 layer whose thickness is governed by current density acts as a precursor to BaTiO sub 3 . Formation of BaTiO sub 3 is favored only in highly alkaline solutions, which is consistent with the phase stability reported for the Ba-Ti-CO sub 2 -H sub 2 O system at 25 degrees . Lower processing temps. (55 degrees ) favor the formation of thick, electrically resistive, and well-crystallized BaTiO sub 3 films. Films produced at 100 degrees are thinner and are electrically conductive. 37 refs.