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Sol-Gel Processing and Structure Development of Lead TitanateParticles

Published online by Cambridge University Press:  21 February 2011

John S. Wright  and
Lorraine Falter Francis
John S. Wright
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. S.E., Minneapolis, MN 55455.
Lorraine Falter Francis
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. S.E., Minneapolis, MN 55455.
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Abstract

Spherical particles of lead titanate, PbTiO3, (PT) were preparedfrom partially hydrolyzed alkoxide solutions modified with benzoic acid.Modified and aged alkoxide solutions were added dropwise to isopropylalcohol, forming particles (0.2 to 1.0 μm in diameter). FTIR spectroscopyresults demonstrate chelation of the PT alkoxide which prevented theformation of an extended gel network. Diffuse reflectance FTIR (DRIFT)spectra indicate the benzoate ligands are present until 450°C; TGA resultsshow significant weight loss at 450°C. PT particles crystallize into theperovskite phase at =450°C, as determined by DTA and XRD. The relatively lowcrystallization temperature may be due to the effect of benzoate ligands onamorphous structure and presence of internal surfaces.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 797
Copyright
Copyright © Materials Research Society 1998

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References

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