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Low temperature synthesis of ultrafine LiTaO3 powders

Published online by Cambridge University Press:  31 January 2011

Pradeep P. Phulé ,
Thomas A. Deis  and
David G. Dindiger
Pradeep P. Phulé*
Affiliation:
Department of Materials Science and Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
Thomas A. Deis
Affiliation:
Department of Materials Science and Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
David G. Dindiger
Affiliation:
Department of Materials Science and Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
*
a)Address correspondence to this author.
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Abstract

Controlled chemical polymerization of tantalum ethoxide in the presence of glacial acetic acid (HOAc/Alk. = 16) and solubilized lithium acetate (Li/Ta = 1.00, H2O/Alk. = 55.55) was used for the preparation of an amorphous gel precursor to LiTaO3. Although additional investigations are required, the results suggest that successful formation of amorphous gel network, as opposed to that of colloidal tantalum (hydrous) oxide, may be due to the generation of a new organotantalum precursor via a structural modification reaction between the tantalum ethoxide and glacial acetic acid. The evolution of LiTaO3 ceramics from pre-ceramic gels was investigated using thermal analysis, electron microscopy, and x-ray diffraction. The results indicate that after the completion of gel pyrolysis (200–400 °C) and crystallization (Tc = 590 °C), ultrafine (average particle size 100–300 nm), single phase, crystalline (a = 5.243, c = 13.812 Å) LiTaO3 powders can be prepared at low processing temperatures.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 7 , July 1991 , pp. 1567 - 1573
Copyright
Copyright © Materials Research Society 1991

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References

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