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Evolution Of Molecular Structure In Alkoxide-Derived Lithium Niobate

Published online by Cambridge University Press:  28 February 2011

Dennis J. Eichorst and
D. A. Payne
Dennis J. Eichorst
Affiliation:
Department of Materials Science and Engineering, and the Beckman Institute for Advanced Science and Technology, University of lllinois at Urbana-Champaign, Urbana, IL.
D. A. Payne
Affiliation:
Department of Materials Science and Engineering, and the Beckman Institute for Advanced Science and Technology, University of lllinois at Urbana-Champaign, Urbana, IL.
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Abstract

Structural rearrangements during the sol-gel processing of lithium niobate were investigated by FTlR and Raman spectroscopic methods. The reaction of lithium ethoxide with niobium ethoxide resulted in the formation of a bimetallic alkoxide, LiNb(OEt)6 , which could be crystallized from solution. Single crystals were comprised of helical polymeric units consisting of niobium octahedra linked by lithium in tetrahedral (distorted) coordination. Successive crystallizations from solution allowed for the enhanced purification of the alkoxide precursor. Hydrolysis of the bimetallic alkoxide resulted in the formation of an amorphous network structure, which contained niobium-oxygen octahedral units modified by lithium. Heat-treatment facilitated structural rearrangements for the niobium environment, which allowed for the formation of the lithium niobate crystal structure. Further heat-treatment above 700°C resulted in structural changes associated with lithium oxide volatility.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 180: Symposium A – Better Ceramics Through Chemistry IV , 1990, 669
Copyright
Copyright © Materials Research Society 1990

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References

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