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Synthesis and Dielectric Properties of SrBi2Nb2O9 Layered Perovskite by Sol-Gel Processing

Published online by Cambridge University Press:  10 February 2011

Y. Wu ,
F. S. Ohuchi  and
G. Z. Cao
Y. Wu
Affiliation:
University of Washington, Dept. of Materials Science and Engineering, Seattle, WA 98195
F. S. Ohuchi
Affiliation:
University of Washington, Dept. of Materials Science and Engineering, Seattle, WA 98195
G. Z. Cao
Affiliation:
University of Washington, Dept. of Materials Science and Engineering, Seattle, WA 98195
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Abstract

Ferroelectric layered perovskite strontium bismuth niobium oxide SrBi2Nb2O9(SBN) ceramics and films were made by sol-gel processing. A multiple step hydrolysis-condensation process was applied to the synthesis of the SBN sol by using inorganic salts as precursors with citric acid as a complexing agent. Single phase polycrystalline SBN was obtained after heat-treatment at 650°C. It was found that the dielectric constants of SBN ceramics were dependent on heat-treatment. SEM, XPS, TGA/DTA and XRD analyses indicated that bismuth-deficiency may contribute to the relatively low dielectric constants. While a prolonged firing time at high temperatures may lead to a lattice expansion resulting in a significant decrease of the dielectric constant. C-oriented SBN films were obtained by dip-coating onto SrTiO3 substrates and the films are dense and crack-free with a thickness of 900 nm.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 541: Symposium O – Ferroelectric Thin Films VII , 1998 , 253
Copyright
Copyright © Materials Research Society 1999

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References

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