Hostname: page-component-7c8c6479df-ph5wq Total loading time: 0 Render date: 2024-03-28T19:40:30.104Z Has data issue: false hasContentIssue false

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
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
Get access

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
Copyright
Copyright © Materials Research Society 2001

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1.Kozuka, H. and Kajimura, M., Chem. Lett. 1029 (1999).CrossRefGoogle Scholar
2.Kozuka, H. and Kajimura, M., J. Am. Ceram. Soc. 83, 1056 (2000).CrossRefGoogle Scholar
3.Kozuka, H. and Kajimura, M., Hirano, T., and Katayama, K., J. Sol-Gel Sci. Technol. 19, 205 (2000).Google Scholar
4.Kozuka, H., Kajimura, M., Katayama, K., Isota, Y., and Hirano, T., in Chemical Processing of Dielectrics, Insulators, and Electronic Ceramics, edited by Jones., A.C., Veteran, J., Kaushal, S., Mullin, D., and Cooper, R. (Mater. Res. Soc. Symp. Proc. 600, Warrendale, PA, 2000), p. 187.Google Scholar
5.Kozuka, H., Isota, Y., and Hosokawa, M., in Proceedings of the 7th International Conference on Ceramic Processing Science, In-uyama, Japan, May 15–18, 2000 (in press).Google Scholar
6.Kozuka, H., Katayama, K., Isota, Y., and Takenaka, S., paper presented at the American Ceramic Society 102nd Annual Meeting & Exposition, St. Louis, MO, April 30–May 3, 2000.Google Scholar
7.Kozuka, H. and Higuchi, A. (submitted for publication).Google Scholar
8.Nyquist., R.A., Putzig., C.L., and Leugers., M.A., The Handbook of Infrared and Raman Spectra of Inorganic Compounds and Or-ganic Salts, Vol. 3, Infrared and Raman Spectral Atlas of Inor-ganic Compounds and Organic Salts: Infrared Spectra (Academic Press, New York, 1997).Google Scholar
9.Colthup., N.B., Daly., L.H., and Wiberley., S.E., Introduction to In-frared and Raman Spectroscopy, 2nd ed. (Academic Press, New York, 1975).Google Scholar
10.Marchant., R.E., Yu, D., and Khoo, C., J. Polym. Sci., Part A: Polym. Chem. 27, 881 (1989).CrossRefGoogle Scholar
11.Last., J.T., Phys. Rev. 105, 1740 (1957).CrossRefGoogle Scholar
12.Saegusa, T. and Chujo, Y., J. Macromol. Sci., Chem. A27, 1603 (1990).CrossRefGoogle Scholar