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Microscopy Studies of Sol-Gel Derived Lithium Niobate

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:
Univeristy of California, Dept. of Mechanical and Aerospace Engineering, Irvine, CA 92717
Martha L. Mecartney
Affiliation:
Univeristy of California, Dept. of Mechanical and Aerospace Engineering, Irvine, CA 92717
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Abstract

Lithium niobate prepared by sol-gel techniques can crystallize at temperatures as low as 200°C, and achieve a high homogeneity. In this sutdy, nucleation, crystallization, and morphological development are examined by TEM for alkoxide derived LiNbO3. Preliminary studies show that the as-dried gel is completely amorphous and homogeneous. Between 150-200°C, crystallization begins with crystallites on the order of 10-20 nm appearing in the amorphous matrix. By 450°C, single crystal spheroidal particles (0.05 - 0.2 gm) form. By 600°C, facetted large crystallites on the order of 1 gtm develop. Grain size and porosity are strongly dependent on the amount of water of hydrolysis in thin films.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 249: Symposium Q – Synthesis and Processing of Ceramics: Scientific Issues , 1991 , 459
Copyright
Copyright © Materials Research Society 1992

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References

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