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Single-layer submicron-thick BaTiO3 coatings from poly(vinylpyrrolidone)-containing sols: Gel-to-ceramic film conversion, densification, and dielectric properties

Published online by Cambridge University Press:  31 January 2011

Hiromitsu Kozuka  and
Atsushi Higuchi
Hiromitsu Kozuka
Affiliation:
Department of Materials Science and Engineering, Kansai University, 3–3–35 Yamate-cho, Suita, Osaka-Fu 564-8680, Japan
Atsushi Higuchi
Affiliation:
Department of Materials Science and Engineering, Kansai University, 3–3–35 Yamate-cho, Suita, Osaka-Fu 564-8680, Japan
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Abstract

BaTiO3-coating films were prepared from a solution containing poly(vinylpyrrolidone) (PVP) of molar composition Ba(CH3COO)2:Ti(OC2H5)4:PVP:CH3COOH:H2O: C2H5OH = 1:1:0.5:27:4:5, via nonrepetitive, single-step dip-coating. The gel films were found to be converted into BaTiO3 films via evaporation of the solvent and CH3COOH below 210 °C, decomposition of PVP at 210–360 °C, decomposition of CH3COO− below 440 °C, and crystallization at 500–610 °C. The decomposition of PVP was accompanied by the progress of the condensation reaction, which resulted in significant reduction in film thickness. When the gel films were heated isothermally at 700 °C, crack-free BaTiO3 films as thick as 0.9 μm were obtained. When the gel films were heated isothermally at 360 °C and then at 700 °C, the film became denser. Higher dielectric constants around 290 were found for the film that underwent the isothermal heat treatment at 360 °C. A slower rate of PVP decomposition was thought to be the key for the film densification.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 11 , November 2001 , pp. 3116 - 3123
Copyright
Copyright © Materials Research Society 2001

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References

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