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Microstructural Variations in Sol-Gel Processed Lithium Niobate thin Films

Published online by Cambridge University Press:  25 February 2011

Vikram Joshi ,
Grace K. Goo  and
Martha L. Mecartney
Vikram Joshi
Affiliation:
University of Minnesota, Dept. of Chemical Engineering and Materials Science, Minneapolis, MN 55455
Grace K. Goo
Affiliation:
University of California at Irvine, Materials Science and Engineering Program, Irvine, CA 92717
Martha L. Mecartney
Affiliation:
University of Minnesota, Dept. of Chemical Engineering and Materials Science, Minneapolis, MN 55455
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Abstract

LiNbO3 thin films were deposited by dip coating Li-Nb alkoxide solutions onto silicate glass substrates and single crystal sapphire substrates. Microstructural characterization using transmission electron microscopy (TEM) showed significant differences in film microstructures dependent on the initial solution chemistry. Fully crystalline films could be obtained after heat treatments at 400°C in air. The grain size and porosity were dependent on the amount of water of hydrolysis in the alkoxide sol. The higher the water content, the larger the grain size and porosity. Crystallization studies of nucleation and growth of LiNbO3 for films heat treated from 300–600°C indicated that higher temperatures or long soak times generated large facetted grain structures. Single crystalline films were obtained on (0001) sapphire substrates.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 271: Symposium N – Better Ceramics Through Chemistry V , 1992 , 377
Copyright
Copyright © Materials Research Society 1992

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References

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