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Preparation of Barium Titanate Films at 55°C by an Electrochemical Method
Author(s) -
Bendale Priya,
Venigalla Sridhar,
Ambrose John R.,
Verink Ellis D.,
Adair James H.
Publication year - 1993
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.1151-2916.1993.tb03990.x
Subject(s) - materials science , titanium , barium titanate , electrolyte , titanium oxide , oxide , microstructure , chemical engineering , titanate , mineralogy , barium , analytical chemistry (journal) , electrode , composite material , metallurgy , ceramic , chemistry , chromatography , engineering
Work by previous investigators has shown that BaTiO 3 films can be synthesized from solution over temperature ranges from 80°C to greater than 200°C. In the present work, electrically insulating crystalline films of BaTiO 3 have been electrochemically deposited on titanium substrates at temperatures as low as 55°C. Auger spectroscopic analyses with depth profiling indicate that a titanium oxide layer whose thickness is governed by current density acts as a precursor to BaTiO 3 . Formation of BaTiO 3 is found to be favored only in highly alkaline solutions. This is consistent with the phase stability reported for the Ba─Ti─CO 2 ─H 2 O system at 25°C. Lower processing temperatures (55°C) favor the formation of thick, electrically resistive, and wellcrystallized BaTiO 3 films, apparently due to increased oxygen solubility in the electrolyte solution. Films produced at 100°C are much thinner and are electrically conductive due to fissures and pores in their microstructure. Initial studies on the effect of current density indicate the formation of thinner and porous films with thicker titanium oxide intermediate layers.